Showing posts with label amplifier. Show all posts
Showing posts with label amplifier. Show all posts
Wednesday, December 18, 2013
50W Electronic Amplifier Rise
This electronic amplifier project is an IC amplifier module from ST Microelectronics, the TDA7294. It is intended for use as a top quality audio class AB amplifier in hi-fi applications. Its low noise and distortion, wide bandwidth and nice output current capability, enabling it to supply high power in to both four ohm and 8 ohm lots. Its both short circuit and thermal protection.
With the addition of a handful of parts and an appropriate power supply, this module will deliver over 50W RMS in to four or 8 ohms-with < 0.1% Total Harmonic Distortion (THD) and < 0.1% Inter-modulation Distortion (IMD). It is also suitable as a replacement power amp stage, or upgrade for plenty of existing amplifiers of between 30W-50W, provided they have an appropriate dual supply, & most do.
With the addition of a handful of parts and an appropriate power supply, this module will deliver over 50W RMS in to four or 8 ohms-with < 0.1% Total Harmonic Distortion (THD) and < 0.1% Inter-modulation Distortion (IMD). It is also suitable as a replacement power amp stage, or upgrade for plenty of existing amplifiers of between 30W-50W, provided they have an appropriate dual supply, & most do.
The Specifications of the electronic amplifier project there are:
D.C. Input : 35V
Output power : > 50W RMS, 4-8 ohm load.
Gain : 24 dB (30dB modification)
Input sensitivity : one.3V for 50W, 8 ohm
Signal-to-Noise ratio : > 95 dB, (>105 dBA)
Frequency response : approx. 20Hz - 200kHz, �3 dB
Slew rate : > 10V/uS
THD : < 0.01%, 1W-40W, 1kHz
IMD : < 0.01%, 1W
D.C. Input : 35V
Output power : > 50W RMS, 4-8 ohm load.
Gain : 24 dB (30dB modification)
Input sensitivity : one.3V for 50W, 8 ohm
Signal-to-Noise ratio : > 95 dB, (>105 dBA)
Frequency response : approx. 20Hz - 200kHz, �3 dB
Slew rate : > 10V/uS
THD : < 0.01%, 1W-40W, 1kHz
IMD : < 0.01%, 1W
The maximum supply voltage of the IC is +/- 40V. However the maximum dissipation of the IC can be exceeded even at a lower voltage. Therefore the supply voltage used require not be over +/- 35V. This can be constructed using a 50V middle tapped-transformer, a diode bridge rated at 5A (min.) & a pair of electrolytic capacitors, as shown below. A lower secondary voltage transformer could even be used but the reduced DC voltage will lead to less power output in to 8 ohms. You can still receive 50W in to four ohms with only 24V supply rails.
A 36V C.T. transformer will give you approx +/- 25V rails. The-mains transformer used ought to be rated at a maximum of 80VA. In the event you require to run modules in a stereo amplifier you can use a common power supply. In this case the transformer ought to be rated at 150VA or greater.
A 36V C.T. transformer will give you approx +/- 25V rails. The-mains transformer used ought to be rated at a maximum of 80VA. In the event you require to run modules in a stereo amplifier you can use a common power supply. In this case the transformer ought to be rated at 150VA or greater.
Electronic Amplifier Circuit Diagram Description
Most of the circuitry is contained within the IC module. The input signal is applied to pin three by capacitor C1 & low-pass filter R1/C2. The filter improves the pulse response & helps cease RF signals. The lower -3dB point is determined-by R2/C1 & R4/C3. This is about 20Hz for the values used. The upper -3dB point is over 200kHz. C7/C8 & C9/C10 provide additional power supply filtering or decoupling.
.gif "50W Electronic Amplifier (Rise)")
R3/R4 are the feedback resistors. The gain is 1+R3/R4 which is approx 16 times, or 24dB. In case you need to increase the input sensitivity you may alter the resistors to suit. Changing R3 to 22k would increase the gain to 30dB and lower the input-required for 50W in to 8 ohm, to 0.6V, without affecting performance much. In case you reduce the worth of R4 you will also need to increase C3 to maintain bass response, as this sets the feedback low frequency roll off.
Pin ten is a mute input and pin 9 provides a standby mode. Muting ought to always happen before standby mode is selected. Connecting these pins permanently to the supply rail ensures that the amplifier comes on immediately on power up. Any switch-on clicks may be eliminated by increasing the time constants of R5/C4 and R6/C5 if necessary.
Make definite that a heavy duty heat-sink rated at least one.4 degree C/W or better is used.
Pin ten is a mute input and pin 9 provides a standby mode. Muting ought to always happen before standby mode is selected. Connecting these pins permanently to the supply rail ensures that the amplifier comes on immediately on power up. Any switch-on clicks may be eliminated by increasing the time constants of R5/C4 and R6/C5 if necessary.
Make definite that a heavy duty heat-sink rated at least one.4 degree C/W or better is used.
Thursday, August 8, 2013
20W Surround audio amplifier with SI 1020G
Have you been use the IC above? if those who have not, IC above is used or applied to the audio power amplifier. IC processing is quite good for use on amplifier home, or room. IC used is SI1020G who have not very high output with only 20W 8 ohm impedance speakers. Supply voltage ranging from 12 volt to 23 volts.Below schematic audio amplifier with IC SI1020G
Part List
R1 = 100K
R2 = 1R
C1 = 2u2F
C2 = 100uF
C3 = 47uF
C3 = 47uF
C4 = 10uF
C5 = 2200uF
C6 = 47uF
C5 = 2200uF
C6 = 47uF
C7 = 100uF
Wednesday, May 29, 2013
Good Quality Sound Amplifier Circuit
This amplifier circuit has a pretty good quality. Of course the sound quality, although this one amplifier does not have a large output power but in terms of soft and loud voice that this amplifier can be unreliable.
With a single IC capitalize MPC576H and several other supporting components you have to make this amplifier circuit. Voltage at least 9 Volt and 24 Volt Max. Output Power 3.5 Watts with 8 Ohm impedance.
With a single IC capitalize MPC576H and several other supporting components you have to make this amplifier circuit. Voltage at least 9 Volt and 24 Volt Max. Output Power 3.5 Watts with 8 Ohm impedance.
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| Good Quality Sound Amplifier Circuit |
Saturday, April 13, 2013
100W Guitar Power Amplifier Rise
The power amp board has remained unchanged since it used to be first published in 2002. It indubitably shouldn't be damaged, so there is not any purpose to fix it. The image under presentations a completely assembled board (obtainable as proven as M27). Using TIP35/36C transistors, the output stage is deliberately large overkill. This be sure thats reliability beneath the most arduous stage conditions. No amplifier can additionally be made immune from the complete lot, but this does come shut.
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Guitar Power Amplifier Board
The power amp (like the earlier model) is loosely based on the 60 Watt amp traditionally in the past published (Project 03), however its increased acquire to check the preamp. Other changes include the short circuit safety - the tiny groups of sections subsequent to the bias diodes (D2 and D3). This new version is not hugely totally different from the unique, but has adjustable bias, and is designed to provide a \"constant present\" (i.e. excessive impedance) output to the audio system - that is executed using R23 and R26. Note that with this arrangement, the gain will trade depending on the burden impedance, with lower impedance giving lower energy amp gain. This isn't an argument, so may protectedly be disregarded.
Ought to the output be quicked, the regular current output attribute will provide an preliminary level of safety, but is no lengthyer foolproof. The brief circuit protection will restrict the output current to a relatively protected degree, however a sustained short will cause the output transistors to fail if the amp is driven hard. The safety is designed to now not function below customary prerequisites, however will restrict the peak output current to about 8.5 Amps. Under these conditions, the internal fuses (or the output transistors) will most likely blow if the short just isn't detected in time.
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Figure 2 - Power Amplifier
Figure two shows the facility amp PCB phases - excluding for R26 which doesnt mount on the board. See Figure 1B to bathroom toiletk where this ought to be bodily set up. The bias present is adjustable, & ought to be set for about 25mA dormant present (more on this later). The counselation for energy transistors has been changed to better power devices. This will give more advantageous reliability underneath sustained heavy usage.
As proven, the energy transistors will have an simple time using any load right down to 4 ohms. In case you dont use the PCB (or are chuffed to mount power transistors off the board), you will have to use TO3 transistors for the output stage. MJ15003/4 transistors are high power, & will run cooler as a consequence of the TO-3 casing (lower thermal resistance). Watch out for counterfeits though! Theres a entire lot of different excessive energy transistors that can be used, & the amp is tolerant of replaces (as lengthy as their scores are at the least equal to the tools proven). The PCB can accommodate Toshiba or Motorola 150W flat-pack power transistors with relative ease - when you preferred to go that manner. TIP3055/2966 or MJE3055/2955 may additionally be used for light or ordinary accountability.
At the enter end (as proven in Figure 1B), there is provision for an auxiliary output, & an enter. The latter is switched via the jack, so you want to use the \"Out\" & \"In\" connections for an out of doors impacts unit. Alternatively, the input jack can be utilized to connect an outside preamp to the ability amp, disconnecting the preamp.
The speaker connections allow as much as eight Ohm speaker cabinets (giving 4 Ohms). Do not use not as a lot as 4 ohm heaps on this amplifier - it's no lengthyer designed for it, & wont give dependable service!
The speaker connections allow as much as eight Ohm speaker cabinets (giving 4 Ohms). Do not use not as a lot as 4 ohm heaps on this amplifier - it's no lengthyer designed for it, & wont give dependable service!
All the low value (i.e. zero.1 & 0.22 ohm) resistors must be rated at 5W. The zero.22 ohm resistors will get heat, so mount them faraway from different parts. Needless to assert, I recommend using the PCB, as this has been designed for superior performance, and the amp gives an awesome account of itself. So good in reality, that it's going to even be used as a hi-fi amp, and it sounds very good. In case you have been to make use of the amp for hi-fi, the bias present should be elevated to 50mA. Ideally, you could probably use higher (faster / more linear) output transistors as well, however even with these distinctive the amp performs well certainly. This is essentially because they are run at comparatively low energy, and the extreme non-linearity impacts would predict with best transistors don't occur as a end result of the parallel output stage.
Make positive that the bias transistor is hooked up to of the motive forces (the PCB is laid out to make this easy to do). A some quantity of warmth sink compound in addition to a cable tie will do the job smartly. The diodes are there to offer safety to the amp from catastrophic failure must the bias servo be incorrectly wired (or set for maximum present). All diodes needs to be 1N4001 (or 1N400? - anything within the 1N400x vary is fine). A heat sink will not be wanted for any of the driver transistors.
The life of a guitar amp is a difficult, and I counsel that you simply use the largest warmth sink you can afford, on the grounds that it is common to have increased temperatures on stage (chiefly because of all the gentleing), and this scale backs the securety margin that typically applies for domestic gear. The warmth sink must be rated at zero.5° C/Watt to allow for worst case long term operation at as so much as 40°C (this is now not unusual on stage).
Make positive that the speaker connectors are remoted from the chassis, to keep the integrity of the earth isolation sections in the power supply, & to ensure that the excessive impedance output is maintained.
Make positive that the speaker connectors are remoted from the chassis, to keep the integrity of the earth isolation sections in the power supply, & to ensure that the excessive impedance output is maintained.
Friday, April 12, 2013
1W BTL Audio Amplifier Circuit Diagram
The TDA8581(T) from Philips Semiconductors is a 1-watt Bridge Tied Load (BTL) audio power amplifier capable of delivering 1 watt output power into an 8-Wload at THD (total harmonic distortion) of 10% and using a 5V power supply.
The schematic shown here combines the functional diagram of the TDA8551 with its typical application circuit. The gain of the amplifier can be set by the digital volume control input. At the highest volume setting, the gain is 20 dB. Using the MODE pin the device can be switched to one of three modes: standby (MODE level between Vp and Vp–0.5 V), muted (MODE level between 1 V and Vp–1.4 V) or normal (MODE level less than 0.5 V). The TDA8551 is protected by an internal thermal shutdown protection mechanism. The total voltage loss for both MOS transistors in the complementary output stage is less than 1 V.
Circuit diagram:
1 Watt BTL Audio Amplifier Circuit Diagram
Using a 5-V supply and an 8-W loudspeaker, an output power of 1 watt can be delivered. The volume control has an attenuation range of between 0 dB and 80 dB in 64 steps set by the 3-state level at the UP/DOWN pin: floating: volume remains unchanged; negative pulses: decrease volume; positive pulses: increase volume Each pulse at he Up/DOWN pin causes a change in gain of 80/64 = 1.25 dB (typical value).
When the supply voltage is first connected, the attenuator is set to 40 dB (low volume), so the gain of the total amplifier is then –20 dB. Some positive pulses have to be applied to the UP/DOWN pin to achieve listening volume. The graph shows the THD as a function of output power. The maximum quiescent current consumption of the amplifier is specified at 10 mA, to which should be added the current resulting from the output offset voltage divided by the load impedance.
Thursday, April 11, 2013
Circuit Guards Amplifier Outputs Against Overvoltage
A universal requirement for automotive electronics is that any device with direct connections to the wiring harness must be able to withstand shorts to the battery voltage. Though brutal, this requirement is necessary for reliability and for safety. One example of the need for this protection is an audio amplifier that produces indicator noises in the automotive interior. Though operating from a voltage of 3.3 or 5V, which is lower than the battery voltage, the amplifier must be able to stand off the full battery voltage.
Circuit diagram :
During normal operation, the amplifier outputs’ dc components are at one-half of the VCC supply—2.5V in this case, for which VCC is 5V. The 11V gate drive fully enhances the MOSFETs, and the shunt-regulator output is off because its feedback input, Pin 5, is below its internal 0.6V threshold. If either output exceeds 5V, current flows through D3 into the R5/R6 divider, pulling the feedback terminal above its threshold. The shunt-regulator output then pulls the MOSFET-gate voltage from 11V almost to ground, which blocks high voltage from the amplifier by turning off the MOSFETs. The MOSFETs easily withstand the continuous output voltage, and the circuit returns to normal operation when you remove the short. Because the circuit does not respond instantaneously, zener diodes D1 and D2 provide protection at the beginning of a fault condition.
Figure 2. In Figure 1, one of U1s two audio outputs (top trace) is protected when its external terminal accidentally contacts an 18V supply voltage (2nd trace).
The waveforms of Figure 2 represent an operating circuit. One of the amplifier’s outputs (Trace 1) is a 1-kHz sine wave biased at a dc voltage of 2.5V. Trace 2 is the signal on the wire harness. It also starts as a 1-kHz sine wave biased at a 2.5V-dc voltage, but, at 200 µsec, it shorts to an 18V supply. Trace 3 is the shunt regulator’s output, initially biased at 11V but pulled to ground in response to the overvoltage condition. Trace 4 is current in the wire harness. Initially a sine wave, this current drops to zero in response to the overvoltage condition.
The components in Figure 1 optimize this circuit for 5V operation. For other voltages, you can adjust the R5/R6 resistor values. The shunt regulator must be able to function in saturation and, therefore, requires a separate supply pin in addition to the shunt output pin. The circuit repeatedly withstands 28V shorts without damage.
Circuit diagram :
Figure 1 : This output circuit provides continuose protection against overvoltge faults
You can also use a protection network appropriate for these amplifiers for other automotive circuits (Figure 1). A dual N-channel MOSFET disconnects the amplifier’s outputs from the wiring harness in response to a high-voltage condition on either output. The MOSFETs, Q1A and Q1B, are normally on; zener diode D4 and its bias components drive the MOSFETs’ gates to approximately 11V. Dual diode D3 provides a diode-OR connection to the dc voltage on each output, thereby producing a voltage that controls the output of shunt regulator IC2. The circuitry protects IC1, a 1.4W Class AB amplifier suitable for audible warnings and indications for the automotive electronics. During normal operation, the amplifier outputs’ dc components are at one-half of the VCC supply—2.5V in this case, for which VCC is 5V. The 11V gate drive fully enhances the MOSFETs, and the shunt-regulator output is off because its feedback input, Pin 5, is below its internal 0.6V threshold. If either output exceeds 5V, current flows through D3 into the R5/R6 divider, pulling the feedback terminal above its threshold. The shunt-regulator output then pulls the MOSFET-gate voltage from 11V almost to ground, which blocks high voltage from the amplifier by turning off the MOSFETs. The MOSFETs easily withstand the continuous output voltage, and the circuit returns to normal operation when you remove the short. Because the circuit does not respond instantaneously, zener diodes D1 and D2 provide protection at the beginning of a fault condition.
Figure 2. In Figure 1, one of U1s two audio outputs (top trace) is protected when its external terminal accidentally contacts an 18V supply voltage (2nd trace).The waveforms of Figure 2 represent an operating circuit. One of the amplifier’s outputs (Trace 1) is a 1-kHz sine wave biased at a dc voltage of 2.5V. Trace 2 is the signal on the wire harness. It also starts as a 1-kHz sine wave biased at a 2.5V-dc voltage, but, at 200 µsec, it shorts to an 18V supply. Trace 3 is the shunt regulator’s output, initially biased at 11V but pulled to ground in response to the overvoltage condition. Trace 4 is current in the wire harness. Initially a sine wave, this current drops to zero in response to the overvoltage condition.
The components in Figure 1 optimize this circuit for 5V operation. For other voltages, you can adjust the R5/R6 resistor values. The shunt regulator must be able to function in saturation and, therefore, requires a separate supply pin in addition to the shunt output pin. The circuit repeatedly withstands 28V shorts without damage.
Source : http://www.ecircuitslab.com/2012/06/circuit-guards-amplifier-outputs.html
Wednesday, April 10, 2013
300W POWER AMPLIFIER FOR SUBWOOFER CIRCUIT DIAGRAM
300W POWER AMPLIFIER FOR SUBWOOFER CIRCUIT DIAGRAM
Continuous power into 8 ohms is typically over 150W (250W for ±70V supplies), and it can be used without additional transistors at full power into an 8 ohm load all day, every day. The additional transistors are only needed if you want to do the same thing into 4 ohms at maximum supply voltage
Although I have shown MJL4281A and MJL4302A output transistors, because they are new most constructors will find that these are not as easy to get as they should be. The alternatives are MJL3281/ MJL1302 or MJL21193/ MJL21194.
Because this amplifier circuit operates in "pure" Class-B (something of a contradiction of terms, I think), the high frequency distortion will be relatively high, and is probably unsuited to high power hi-fi. At the low frequency end of the spectrum, there is lots of negative feedback, and distortion is actually rather good, at about 0.04% up to 1kHz. My initial tests and reports from others indicate that there are no audible artefacts at high frequencies, but the recommendation remains.
Tuesday, April 9, 2013
Wide Voltage Range 1 8 Watt Audio Power Amplifier with Short Circuit Protection
This is a design circuit for audio power amplifier using protection circuit. This circuit is based on LM4951A. This is the figure of the circuit;
The LM4951A is an audio power amplifier designed for applications with supply voltages ranging from 2.7V up to 9V. The LM4951A is capable of delivering 1.8W continuous average power with less than 1% THD+N into a bridge connected 8Ω load when operating from a 7.5VDC power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4951A does not require bootstrap capacitors, or snubber circuits.
The LM4951A features a low-power consumption active-low shutdown mode. Additionally, the LM4951A features an internal thermal shutdown protection mechanism and short circuit protection. The LM4951A contains advanced pop & click circuitry that eliminates noises which would otherwise occur during turn-on and turn-off transitions. The LM4951A is unity-gain stable and can be configured by external gain-setting resistors.
[Circuit schematic source: National Semiconductor Notes]
Saturday, April 6, 2013
Spirit Amplifier Schematics
Amplifier circuit built-up is pretty nice not always complex. There are a series of amplifiers that I saw a picture of the kit immediately. The circuit is quite simple, there was the most complex in the pre-amp and its protector.
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| Click to view larger | CSE-Circuit Schematic Electronics |
How a series of ...Op-amp stage 1 is the heart of the circuit, the input stage with enough power to drive the power transistor. Sensor1 ntc & 2 can be attached to the main heatsink, this is optional so it can be eliminated, its functions to lower the bias voltage value if the heatsink overheating. There is no bias trimpot, R6 and R8 instead divide the voltage so we get <= 0.6V at the base driver tr.
If the voltage is just a little more driver transistors can be damaged and could trigger the final transistor is damaged in congregation / pairs. These transistors are used frequently broken, but after replaced by Sanken, safe. Thus the risk of the snaps without a limiter amplifier.
A pair of Q1 & Q2 transisitor drivers are the main transistor amplifier, while the other three pairs of transistors that form the current dumping circuit mode so it will work if there is a signal (especially bass). Final installation of this transistor is in the Blazer, hercules, Eti300w / new Giant. The design of this kind are designed to produce a stomping bass tones, the clarity about the number two, but here the driver transistor is working at grade A.The heat generated quite a bit because of using this mode (current dumping) plus the number of final / power transistor which is more than one pair. I used to use a minimal amount of the final two pairs of transistors to avoid this summer.
Installation of the load resistor should still be there at the foot of the emitter. R16 and C4 are usually intended to stabilize (reduce) the frequency of ultra treble.All use of Sanken transistors. Supply 63V 800VA toroid ct. Reservois capacitors used for stereo 2x 10.000uF/100VEstimated power ...500W rms at 8 ohms and 1000W at 4 ohms, but supply is limited in the 800VA transformer. Confused with a power output of this? Do not worry about who is more important than that is the loud speaker and the supply has not decreased. With the supply of the transformer between them are quite satisfied to control the speaker says 18 ".If I may be wrong image, R4-220K-C2 in parallel with 68pF
A pair of Q1 & Q2 transisitor drivers are the main transistor amplifier, while the other three pairs of transistors that form the current dumping circuit mode so it will work if there is a signal (especially bass). Final installation of this transistor is in the Blazer, hercules, Eti300w / new Giant. The design of this kind are designed to produce a stomping bass tones, the clarity about the number two, but here the driver transistor is working at grade A.The heat generated quite a bit because of using this mode (current dumping) plus the number of final / power transistor which is more than one pair. I used to use a minimal amount of the final two pairs of transistors to avoid this summer.
Installation of the load resistor should still be there at the foot of the emitter. R16 and C4 are usually intended to stabilize (reduce) the frequency of ultra treble.All use of Sanken transistors. Supply 63V 800VA toroid ct. Reservois capacitors used for stereo 2x 10.000uF/100VEstimated power ...500W rms at 8 ohms and 1000W at 4 ohms, but supply is limited in the 800VA transformer. Confused with a power output of this? Do not worry about who is more important than that is the loud speaker and the supply has not decreased. With the supply of the transformer between them are quite satisfied to control the speaker says 18 ".If I may be wrong image, R4-220K-C2 in parallel with 68pF
Friday, April 5, 2013
Power amplifier for TV audio
In this amplifier circuit using IC TDA8944J as the main amplifier with dual-channel audio amplifier with 2 x 7W output power at 8 Ω impedance. And a minimum supply voltage of 9-18 Volts. In this ic contains two Bridge Tied Load or BTL amplifier.
The circuit is often found in audio amplifier in a series of television, besides TDA2003, TDA2006 and so forth. PCB for a series of amplifiers using IC TDA8944J is very compatible with all other types of IC in IC TDA894X family unit , and below is a schematics.
Wednesday, April 3, 2013
Tube Power Amplifier 35W Push Pull
Tube Power Amplifier 35W Push Pull is made using a tube and eventually compiled configuration push-pull amplifier. Tube Power Amplifier 35W Push Pull tube til it using EL-34 as the amplifier end.
In the power amplifier that is made with a tube at a glance looks simple because the use of active components that are not complex. It should be noted that the use of tubes in Tube Power Amplifier 35W Push Pull require a high voltage supply, therefore in the process of making and finishing must be careful of high voltage and radiation. Detailed series of Tube Power Amplifier 35W Push Pull can be seen in the following figure. Tube Power Amplifier Series 35W Push Pull
Sign Components Tube Power Amplifier 35W Push Pull
R1 = 470K 0.5 W
R2-5 = 2K2 0.5W
R3 = 150K 0.5W
R4 = 220K 0.5W
R6-10 = 56K 0.5W
R7 = 3.9K 0.5W
R8 = 220R 0.5W
R9 = 1M 0.5W
R11 = 39K 1W
R12-23 = 180K 0.5W
R13-21 = 820K 0.5W
R14-22 = 5K6 0.5W
R15-20 = 680K 0.5W
R16-19 = 100K 0.5W
R17-18 = 3K3 1W
R24 = 470R 2W
TR1-2 = 470R 1W Variable (adj. 270Ω)
C1-3-6-7 = 0.1uf 630V
C2 = 220pF 600v
C4-5 = 16uF 550V
C8-9 = 0.1uF 630V
C10-14 = 0.47uF 630V
C11-13 = 25uF 40V
V1 = E80CC
V2 = E80CC
V3-4 = EL34
Rectifier tube = Z2C
Audio Transformer for T1 = 2x EL34 Push Pull
Power amplifier with tubes often become the choice for a small slewrate so that the resulting audio quality is guaranteed. Tube Power Amplifier 35W in the circuit that is required to supply a high DC voltage is +220 VDC ddengan order to work properly.
Monday, April 1, 2013
1500W Stereo Power Amplifier Schematic
Circuit Power Amplifier has a power output of up to 1500W RMS power amplifier circuit is often used to power sound systems keperlun for outdor. In the final image can be seen a series of power amplifiers using 10 sets of power transistors for the ending.
This power amplifier circuit using a transistor amplifier from the front, signal splitter, driver and power amplifier. Current consumption required is quite large power amplifier that is 15-20 A 1500W power amplifier circuits for this. Supply voltage needed by the power of this amplifier is the optimal working order symmetrical 130VDC (130VDC-130VDC ground). 1500W amplifier circuit below is a picture series of mono, stereo if you want to make it necessary to make two copies of the circuit. For more details can be viewed directly image the following 1500W power amplifier circuit.
The series of High Power Amplifier 1500W With Transistor
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| Click Image to view larger |
In the above series of power amplifer 1500W is equipped to control a DC Offset function to set the power amplifier is turned on at the moment and with no input signal then the output should be 0VDC. Then also equipped with a flow regulator to the power amplifier bias. Final part of this power amplifier requires adequate cooling to absorb the heat generated. Power amplifier is not equipped with a speaker protector, therefore it is necessary diapsang protector on the speaker output so that when the power amplifier is not the case turned on the beat to the speaker that can damage the speaker.
Monday, March 25, 2013
USB Powered Audio Power Amplifier
This circuit of multimedia speakers for PCs has single-chip-based design, low-voltage power supply, compatibility with USB power, easy heat-sinking, low cost, high flexibility and wide temperature tolerance. At the heart of the circuit is IC TDA2822M. This IC is, in fact, mono-lithic type in 8-lead mini DIP package. It is intended for use as a dual audio power amplifier in battery-powered sound players. Specifications of TDA2822M are low quiescent current, low crossover distortion, supply voltage down to 1.8 volts and minimum output power of around 450 mW/channel with 4-ohm loudspeaker at 5V DC supply input.
An ideal power amplifier can be simply defined as a circuit that can deliver audio power into external loads without generating significant signal distortion and without consuming excessive quiescent current. This circuit is powered by 5V DC supply available from the USB port of the PC. When power switch S1 is flipped to ‘on’ position, 5V power supply is extended to the circuit and power-indicator red LED1 lights up instantly. Resistor R1 is a current surge limiter and capacitors C1 and C4 act as buffers. Working of the circuit is simple. Audio signals from the PC audio socket/headphone socket are fed to the amplifier circuit through components R2 and C2 (left channel), and R3 and C3 (right channel)
USB Powered Audio Power Amplifier Circuit diagram:
Potmeter VR1 works as the volume controller for left (L) channel and potmeter VR2 works for right (R) channel. Pin 7 of TDA2822M receives the left-channel sound signals and pin 6 receives the right-channel signals through VR1 and VR2, respectively. Ampl i f ied signals for driving the left and right loudspeakers are available at pins 1 and 3 of IC1, respectively. Components R5 and C8, and R6 and C10 form the traditional zobel network. Assemble the circuit on a medium-size, general-purpose PCB and enclose in a suitable cabinet. It is advisable to use a socket for IC TDA2822M. The external connections should be made using suitably screened wires for better result.
Sucre: http://www.ecircuitslab.com/2011/06/usb-powered-audio-power-amplifier.html
Saturday, March 23, 2013
300w Subwoofer Power Amplifier Wiring Diagramskema Rangkaian
Subwoofer Speaker Wiring Diagram Subwoofer Review.
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Discuss Ep4000 Maelstrom X Ii In The Diy Subwoofers Forum.
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Bazooka Subwoofer Wiring Diagram.
Need Sum Help Wiring Dual Coil Sub And Box Build Trinituner Com.
Car Subwoofer Wiring By Mustafa.
Sub 2 Output Is An Excellent Way To Connect Your Subwoofers The Total.
Friday, March 22, 2013
Portable 9v Headphone Amplifier
High Quality One-IC unit, Low current consumption
After several requests by correspondents, the decision of designing a 9V powered Headphone Amplifier was finally taken. The main requirement was to power the circuit by means of a common, PP3 (transistor radio) alkaline battery. So, implementing a low current drawing circuit was absolutely necessary, though preserving a High Quality performance.
Circuit Diagram:
Portable 9v Headphone Amplifier Circuit Diagram
Parts:P1 = 22K
R1 = 18K
R2 = 68K
R3 = 68K
R4 = 68K
R5 = 18K
R6 = 68K
C1 = 4.7uF-25v
C2 = 4.7uF-25v
C3 = 22pF
C4 = 220uF-25v
C5 = 220uF-25v
C6 = 4.7uF-25v
C7 = 22pF
C8 = 220uF-25v
J1 = 3.5mm Stereo Jack
B1 = 9V Alkaline Battery
IC1 = NE5532-34
SW1 = SPST Toggle Switch
The appearance of the 5534 low-noise op-amp at a reasonable price was much appreciated by audio designers. It is now difficult or impossible to design a discrete stage that has the performance of the 5534 without quite unacceptable complexity. 5534 op-amps are now available from several sources, in a conventional 8-pin d.i.l. format. This version is internally compensated for gains of three or more, but requires a small external capacitor (5-15pF) for unity-gain stability. The 5532 is a very convenient package of two 5534s in one 8-pin device with internal unity-gain compensation, as there are no spare pins.
The 5534/2 is a low-distortion, low-noise device, having also the ability to drive low-impedance loads to a full voltage swing while maintaining low distortion. Furthermore, it is fully output short-circuit proof. Therefore, this circuit was implemented with a single 5532 chip forming a pair of stereo, inverting amplifiers, having an ac gain of about 3.5 and capable of delivering up to 3.6V peak-to-peak into a 32 Ohm load (corresponding to 50mW RMS) at less than 0.025% total harmonic distortion (1kHz & 10kHz). If we consider that the mean current drawing at a power output of 15mW per channel is around 12-13mA (both channels driven), this Headphone Amplifier will become a must for many DIY enthusiasts needing a High Quality, High Performance portable device.
Sensitivity:
200mV RMS for 15.6mW RMS output
350mV RMS for 50mW RMS output
Maximum undistorted output: 3.6V Peak-to-peak
Frequency response: flat from 40Hz to 20KHz; -2.3dB @ 20Hz
Total harmonic distortion @ 1KHz: <0.025% at all power outputs up to 50mW RMS
Total harmonic distortion @10KHz: <0.02% at all power outputs up to 50mW RMS
Total current drawing @ 9V supply (both channels driven):
Standing current: 8.5mA
Mean current drawing @ 15mW RMS per channel: 12mA
Mean current drawing @ 35mW RMS per channel: 17mA
Source : www.redcircuits.com
Thursday, March 21, 2013
10W Audio Amplifier With Bass Boost
High Quality, very simple design, No preamplifier required
This design is based on the 18 Watt Audio Amplifier, and was developed mainly to satisfy the requests of correspondents unable to locate the TLE2141C chip. It uses the widespread NE5532 Dual IC but, obviously, its power output will be comprised in the 9.5 - 11.5W range, as the supply rails cannot exceed ±18V. As amplifiers of this kind are frequently used to drive small loudspeaker cabinets, the bass frequency range is rather sacrificed. Therefore a bass-boost control was inserted in the feedback loop of the amplifier, in order to overcome this problem without quality losses. The bass lift curve can reach a maximum of +16.4dB @ 50Hz. In any case, even when the bass control is rotated fully counterclockwise, the amplifier frequency response shows a gentle raising curve: +0.8dB @ 400Hz, +4.7dB @ 100Hz and +6dB @ 50Hz (referred to 1KHz).
Circuit diagram :
10W Bass Boost Amplifier Circuit Diagram
Parts:
P1_________________22K Log.Potentiometer (Dual-gang for stereo)
P2_________________100K Log.Potentiometer (Dual-gang for stereo)
R1_________________820R 1/4W Resistor
R2,R4,R8___________4K7 1/4W Resistors
R3_________________500R 1/2W Trimmer Cermet
R5_________________82K 1/4W Resistor
R6,R7______________47K 1/4W Resistors
R9_________________10R 1/2W Resistor
R10________________R22 4W Resistor (wirewound)
C1,C8______________470nF 63V Polyester Capacitor
C2,C5______________100µF 25V Electrolytic Capacitors
C3,C4______________470µF 25V Electrolytic Capacitors
C6_________________47pF 63V Ceramic or Polystyrene Capacitor
C7_________________10nF 63V Polyester Capacitor
C9_________________100nF 63V Polyester Capacitor
D1_________________1N4148 75V 150mA Diode
IC1_________________NE5532 Low noise Dual Op-amp
Q1_________________BC547B 45V 100mA NPN Transistor
Q2_________________BC557B 45V 100mA PNP Transistor
Q3_________________TIP42A 60V 6A PNP Transistor
Q4_________________TIP41A 60V 6A NPN Transistor
J1__________________RCA audio input socket
Power Supply :
Power Supply Circuit Diagram
Power supply parts:
R11______________1K5 1/4W Resistor
C10,C11__________4700µF 25V Electrolytic Capacitors
D2_______________100V 4A Diode bridge
D3_______________5mm. Red LED
T1_______________220V Primary, 12 + 12V Secondary 24-30VA Mains transformer
PL1______________Male Mains plug
SW1______________SPST Mains switch
Notes:
- Can be directly connected to CD players, tuners and tape recorders.
- Schematic shows left channel only, but C3, C4, IC1 and the power supply are common to both channels.
- Numbers in parentheses show IC1 right channel pin connections.
- A log type for P2 will ensure a more linear regulation of bass-boost.
- Do not exceed 18 + 18V supply.
- Q3 and Q4 must be mounted on heatsink.
- D1 must be in thermal contact with Q1.
- Quiescent current (best measured with an Avo-meter in series with Q3 Emitter) is not critical.
- Set the volume control to the minimum and R3 to its minimum resistance.
- Power-on the circuit and adjust R3 to read a current drawing of about 20 to 25mA.
- Wait about 15 minutes, watch if the current is varying and readjust if necessary.
- A correct grounding is very important to eliminate hum and ground loops. Connect to the same point the ground sides of J1, P1, C2, C3 &C4. Connect C9 to the output ground.
- Then connect separately the input and output grounds to the power supply ground.
Technical data:
Output power:
10 Watt RMS into 8 Ohm (1KHz sinewave)
Sensitivity:
115 to 180mV input for 10W output (depending on P2 control position)
Frequency response:
See Comments above
Total harmonic distortion @ 1KHz:
0.1W 0.009% 1W 0.004% 10W 0.005%
Total harmonic distortion @ 100Hz:
0.1W 0.009% 1W 0.007% 10W 0.012%
Total harmonic distortion @ 10KHz:
0.1W 0.056% 1W 0.01% 10W 0.018%
Total harmonic distortion @ 100Hz and full boost:
1W 0.015% 10W 0.03%
Max. bass-boost referred to 1KHz:
400Hz = +5dB; 200Hz = +7.3dB; 100Hz = +12dB; 50Hz = +16.4dB; 30Hz = +13.3dB
Unconditionally stable on capacitive loads
Source :www.redcircuits.com
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