Showing posts with label power. Show all posts
Showing posts with label power. Show all posts
Wednesday, December 25, 2013
Memory Save on Power down Circuit Diagram
Memory Save on Power down Circuit Diagram. The auxiliary output powers the memory, while the main output powers the system and is connected to the memory store pin. When power goes down, the main output goes low, commanding the memory to store. The auxiliary output then drops out.
Memory Save on Power down Circuit Diagram
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Friday, December 20, 2013
Build a 13KV High voltage Power supply Circuit Diagram
This 13KV High voltage Power supply Circuit Diagram has an inverter around Q1 that supplies 150-V pulses to the converter of SCR1 and C2. The output of ?2 is a 4.5-kV pulse that is multiplied by the voltage-tripler network (right) to produce 13.5 kV. R1 is a 3k to 500K CT transistor audio transforfiler, L2 is a flash tube trigger transformer with a 6-kV secondary.
13KV High voltage Power supply Circuit Diagram
Wednesday, June 12, 2013
10 Amp 13 8 Volt Power Supply Circuit
10 Amp 13.8 Volt Power Supply Parts List :
R1 1.5K ¼ Watt Resistor (optional, tie pins 6 & 5 of IC1 together if not used.)
R2,R3 0.1 Ohm 10 Watt Resistor (Tech America 900-1002)
R4 270 Ohm ¼ Watt Resistor
R5 680 Ohm ¼ Watt Resistor
R6,R7 0.15 Ohm 10 Watt Resistor (Tech America 900-1006)
R8 2.7K ¼ Watt Resistor
R9 1K Trimmer Potentiometer (RS271-280)
R10 3.3K ¼ Watt Resistor
C1,C2,C3,C4 4700 Microfarad Electrolytic Capacitor 35 Volt (observe polarity)
C5 100 Picofarad Ceramic Disk Capacitor
C6 1000 Microfarad Electrolytic Capacitor 25 Volt (observe polarity)
IC1 LM723 (RS276-1740) Voltage Regulator IC. Socket is recommended.
Q1 TIP3055T (RS276-2020) NPN Transistor (TO-220 Heat Sink Required)
Q2,Q3 2N3055 (RS276-2041) NPN Transistor (Large TO-3 Heat Sink Required)
S1 Any SPST Toggle Switch
F1 3 Amp Fast Blow Fuse
D1-D4 Full Wave Bridge Rectifier (RS276-1185)
T1 18 Volt, 10 Amp Transformer Hammond #165S18 (Digi-Key HM538-ND)
10 Amp 13.8 Volt Power Supply Circuit
Friday, May 31, 2013
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Tuesday, April 30, 2013
Transformerless 5 Volt DC Power Supply
An increasing number of appliances draw a very small current from the power supply. If you need to design a mains-powered device, you could generally choose between a linear and a switch-mode power supply. However, what if the appliance’s total power consumption is very small? Transformer-based power supplies are bulky, while the switchers are generally made to provide greater current output, with a significant increase in complexity, problems involving PCB layout and, inherently, reduced reliability.
Is it possible to create a simple, minimum part-count mains (230 VAC primary) power supply, without transformers or coils, capable of delivering about 100mA at, say, 5 V? A general approach could be to employ a highly inefficient stabilizer that would rectify AC and, utilizing a zener diode to provide a 5.1 V output, dissipate all the excess from 5.1 V to (230×√2) volts in a resistor. Even if the load would require only about 10mA, the loss would be approximately 3 watts, so a significant heat dissipation would occur even for such a small power consumption.
Is it possible to create a simple, minimum part-count mains (230 VAC primary) power supply, without transformers or coils, capable of delivering about 100mA at, say, 5 V? A general approach could be to employ a highly inefficient stabilizer that would rectify AC and, utilizing a zener diode to provide a 5.1 V output, dissipate all the excess from 5.1 V to (230×√2) volts in a resistor. Even if the load would require only about 10mA, the loss would be approximately 3 watts, so a significant heat dissipation would occur even for such a small power consumption.
At 100mA, the useless dissipation would go over 30 W, making this scheme completely unacceptable. Power conversion efficiency is not a major consideration here; instead, the basic problem is how to reduce heavy dissipation and protect the components from burning out. The circuit shown here is one of the simplest ways to achieve the above goals in practice. A JVR varistor is used for over-voltage/surge protection. Voltage divider R1-R2 follows the rectified 230 V and, when it is high enough, T1 turns on and T3 cannot conduct.
When the rectified voltage drops, T1 turns off and T3 starts to conduct current into the reservoir capacitor C1. The interception point (the moment when T1 turns off) is set by P1 (usually set to about 3k3), which controls the total output current capacity of the power supply: reducing P1 makes T1 react later, stopping T3 later, so more current is supplied, but with increased heat dissipation. Components T2, R3 and C2 form a typical ‘soft start’ circuit to reduce current spikes — this is necessary in order to limit C1’s charging current when the power supply is initially turned on. At a given setting of P1, the output current through R5 is constant.
Thus, load R4 takes as much current as it requires, while the rest goes through a zener diode, D5. Knowing the maximum current drawn by the load allows adjusting P1 to such a value as to provide a total current through R5 just 5 to 6mA over the maximum required by the load. In this way, unnecessary dissipation is much reduced, with zener stabilization function preserved. Zener diode D5 also protects C1 from over voltages, thus enabling te use of low-cost 16 V electrolytics. The current flow through R5 and D5, even when the load is disconnected, prevents T3’s gate-source voltage from rising too much and causing damage to device. In addition, T1 need not be a high-voltage transistor, but its current gain should exceed 120 (e.g. BC546B, or even BC547C can be used).
When the rectified voltage drops, T1 turns off and T3 starts to conduct current into the reservoir capacitor C1. The interception point (the moment when T1 turns off) is set by P1 (usually set to about 3k3), which controls the total output current capacity of the power supply: reducing P1 makes T1 react later, stopping T3 later, so more current is supplied, but with increased heat dissipation. Components T2, R3 and C2 form a typical ‘soft start’ circuit to reduce current spikes — this is necessary in order to limit C1’s charging current when the power supply is initially turned on. At a given setting of P1, the output current through R5 is constant.
Thus, load R4 takes as much current as it requires, while the rest goes through a zener diode, D5. Knowing the maximum current drawn by the load allows adjusting P1 to such a value as to provide a total current through R5 just 5 to 6mA over the maximum required by the load. In this way, unnecessary dissipation is much reduced, with zener stabilization function preserved. Zener diode D5 also protects C1 from over voltages, thus enabling te use of low-cost 16 V electrolytics. The current flow through R5 and D5, even when the load is disconnected, prevents T3’s gate-source voltage from rising too much and causing damage to device. In addition, T1 need not be a high-voltage transistor, but its current gain should exceed 120 (e.g. BC546B, or even BC547C can be used).
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.
Thursday, April 11, 2013
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]
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.
Saturday, March 30, 2013
MOSFET IRF 350 as Power Follower
The circuit consists of an N-Channel MOSFET voltage follower T1 (common Drain) and current source T2 (NPN Darlington). Current source is set to 2.2 Amps. With 40V of supply voltage the circuit is able to deliver about 17W into an 8 Ohm loudspeaker. The amplifier will take 88W from the power supply all the time. Bandwidth (-3dB) is from 4Hz to 250 kHz. Rise time is 1.5 us. Output resistance is 0.16 Ohm. The circuit is very tolerant of different kinds of load. Input resistance is 10 KOhm (R0), but can be increased up to 100 KOhm (R4) by omitting R0. Input capacitance remains relatively high, about 1500 pF. For this reason, the preamp should not have higher output impedance than 1 KOhm to maintain high frequency limit about 100 kHz. An input potentiometer can be used instead of R0.
If the value of the potentiometer is 5 kOhm then the high frequency limit will be about 70 kHz. The power follower can be connected directly to the output of CD player, and for reduction of volume potentiometer 5 kOhm can be used.
Normally, the thermal coefficient of zener voltage of 3V type is negative, and so is Ube voltage of the Darlington transistor. As Ube is reduced by -2mV/°C, zener voltage also goes down with increasing temperature inside a box (but the zener is not on the heat sink of the MOSFET and should not be). In fact there was a fluctuation of 40mA at 2A constant current, from my point of view it is negligible. Of course the heat sink for T1 and T2 should be better than 0.5°C/W for each transistor, so four such heat sinks are needed for stereo.
If the value of the potentiometer is 5 kOhm then the high frequency limit will be about 70 kHz. The power follower can be connected directly to the output of CD player, and for reduction of volume potentiometer 5 kOhm can be used.
Normally, the thermal coefficient of zener voltage of 3V type is negative, and so is Ube voltage of the Darlington transistor. As Ube is reduced by -2mV/°C, zener voltage also goes down with increasing temperature inside a box (but the zener is not on the heat sink of the MOSFET and should not be). In fact there was a fluctuation of 40mA at 2A constant current, from my point of view it is negligible. Of course the heat sink for T1 and T2 should be better than 0.5°C/W for each transistor, so four such heat sinks are needed for stereo.
12 volt DC Power Supply from USB port
Description :
Using this circuit we can convert 5V DC from the computer USB port to 12V DC and a circuit like this will find a lot of application in USB powered systems. The heart of this circuit is IC LT1618 which is a constant current, constant voltage boost converter. The IC has a wide input voltage range of 1.8 to 18V DC and output voltage can be up to 35V DC.
In the circuit resistors R1, R2 sets the output voltage. Pin number 9 is the shutdown pin, less than 0.3V to this pin will shut down the IC. Pin number four is the current sense adjust pin. The current sense voltage can be reduced by applying a DC voltage to this pin. If this adjustment is not needed connect this pin to ground and you can omit components R3, R5 and Q1.
Circuit diagram of 12 volts dc power supply:
Circuit Diagram-12Volts DC power supply from USB port
Notes :
- C2 and C3 must be rated at least 15V.
- Less than 0.3V at the shutdown pin will shutdown the IC.
- Output voltage is governed by the following equation R1 = R2 ( (Vout /1.263V) -1).
Other Circuits Related to Power
Wednesday, March 27, 2013
Power Supply Circuit with Emergency Backup
The circuit shown below was requested by one of the readers, it is a power supply circuit which trickle charges a battery when AC mains is available, and also feeds the output with the required DC power via D1. Now, the moment AC mains fails, the battery instantly backs up and the compensates the output failure with its power via D2.
All Diodes = 1N5402 for battery up to 20 AH, 1N4007, two in parallel for 10-20 AH battery, and 1N4007 for below 10 AH.
R1 = volt/charging current (Ohms)
Transformer Current/Charging current = 1/10 * batt AH
C1 = 100uF/25
zBot 10 A Power Stage for DC Motor
If you look at the chassis of the zBot vehicle1, you’ll find two parts requiring intelligent control: the steering servo and the DC motor. The so called H-bridge is the normal circuit for electronic control of revolution speed and direction. The DC motor of a Tamiya car is powerful enough to propel zBot at up to 20 miles per hour.
The motor then consumes more than 10 A, so we choose high-current power MOSFETs for the driver stage. There are lots of different devices to choose from. The MOSFET we require has to supply the maximum motor current and, importantly, it has to be switched with gate voltages of about 5 V. In this case, the microcontroller switches the power stage (‘low side’) directly. For high side driving level shifters are necessary. The schematic of the H-bridge power stage shows a few inverters, NAND gates and two tri-stateable drivers. These logic functions are very important as the easier way, i.e.., directly controlling all four MOSFET has a fatal disadvantage.
In case of a software crash it could happen that two ore more MOSFETs are switched on incor-rectly for exam-ple, T4 and T7. In that case, the current through the transistors is limited by the internal resistors of the MOSFETs (about 10 mO) only. Such a fatal error would destroy the MOSFETs. The logic functions configured here effectively avoid illegal states.To control the DC motor, three signals are needed: DIR, PWM and STOP. DIR controls the direction of the motor revolution, PWM the speed, and STOP brakes the motor.
The software module for the DC motor is called dcm.c.(070172-I) The complete document called Zbot the Robot Experimental Platform is available for free downloading from the Elektor Electronics website. The file number is 070172-11.zip (July/August 2007).
Author: Jens Altenburg Copyright: Elektor
Tuesday, March 26, 2013
Simple 5V Power Supply Digital Circuit
This circuit is a small +5V power supply, which is useful when experimenting with digital electronics. Small inexpensive wall tranformers with variable output voltage are available from any electronics shop and supermarket. Those transformers are easily available, but usually their voltage regulation is very poor, which makes then not very usable for digital circuit experimenter unless a better regulation can be achieved in some way. The following circuit is the answer to the problem.
This circuit can give +5V output at about 150 mA current, but it can be increased to 1 A when good cooling is added to 7805 regulator chip. The circuit has over overload and therminal protection.
Circuit diagram:
power supply Circuit diagram
The capacitors must have enough high voltage rating to safely handle the input voltage feed to circuit. The circuit is very easy to build for example into a piece of veroboard.
Pinout of the 7805 regulator IC
- 1. Unregulated voltage in
- 2. Ground
- 3. Regulated voltage out
Component list
7805 regulator IC
100 uF electrolytic capacitor, at least 25V voltage rating
10 uF electrolytic capacitor, at least 6V voltage rating
100 nF ceramic or polyester capacitor
Summary of circuit features
- Brief description of operation: Gives out well regulated +5V output, output current capability of 100 mA
- Circuit protection: Built-in overheating protection shuts down output when regulator IC gets too hot
- Circuit complexity: Very simple and easy to build
- Circuit performance: Very stable +5V output voltage, reliable operation
- Availability of components: Easy to get, uses only very common basic components
- Design testing: Based on datasheet example circuit, I have used this circuit succesfully as part of many electronics projects
- Applications: Part of electronics devices, small laboratory power supply
- Power supply voltage: Unreglated DC 8-18V power supply
- Power supply current: Needed output current + 5 mA
- Component costs: Few dollars for the electronics components + the input transformer cost
Modification ideas
More output current
If you need more than 150 mA of output current, you can update the output current up to 1A doing the following modifications:
Change the transformer from where you take the power to the circuit to a model which can give as much current as you need from output
Put a heatsink to the 7805 regulator (so big that it does not overheat because of the extra losses in the regulator)
Other output voltages
If you need other voltages than +5V, you can modify the circuit by replacing the 7805 chips with another regulator with different output voltage from regulator 78xx chip family. The last numbers in the the chip code tells the output voltage. Remember that the input voltage muts be at least 3V greater than regulator output voltage ot otherwise the regulator does not work well.
source :tkk
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
Sunday, March 24, 2013
Six LED Bar Audio Power Indicator
Useful to monitor audio power delivered to loudspeakers No power supply no setup required
This device, connected to the loudspeaker output of an audio amplifier, will indicate the instantaneous output power delivered to the loudspeaker(s) by means of six LEDs illuminating one after another by voltage values increasing little by little, providing the visual impression of a luminous bar or column, increasing and decreasing in height following the increase and decrease of the signals level.
The input signal is first rectified by D1 and then sent to six different voltage dividers, one for each LED. In this way, the indication provided by the LEDs illumination of this "Power Display", will be related to the instantaneous power sunk by the whole loudspeaker cabinet.
Six output power levels are displayed by the LEDs in a 2W - 80W range (no setup required). Each nominal power level indication into 8 Ohms load is reached when the respective LED illuminates at full brightness.
Circuit Diagram:
Six-LED Bar Audio Power Indicator Circuit Diagram
| Parts | Description |
| R1 | 220R 1/2W Resistor |
| R2,R5,R6,R8 | 100R 1/4W Resistors |
| R10,R12,R14 | 100R 1/4W Resistors |
| R3 | 220R 1/4W Resistor |
| R4,R7 | 330R 1/2W Resistors |
| R9 | 560R 1/2W Resistor |
| R11 | 820R 1/2W Resistor |
| R13 | 1K2 1/2W Resistor |
| D1 | 1N4004 400V 1A Diode |
| D2,D4,D6 | BZX79C2V7 2.7V 500mW Zener Diodes |
| D3,D5,D7,D8,D9,D10 | Red LEDs (Any dimension and shape) (See Notes) |
Notes:
- The output power indicated by each LED must be doubled when 4 Ohms loads are driven.
- The circuit can be adapted to suit less powerful amplifiers by reducing the number of LEDs and related voltage dividers.
- LEDs of any dimension can be used, but rectangular shaped devices will be more suitable to be compacted in bars or columns.
- For a stereo amplifier, two identical circuits are required.
Source : www.redcircuits.com
Saturday, March 23, 2013
Adjustable Stabilized Power Supply 0 15V 5A
Adjustable Stabilized Power Supply 0-15V / 5AThis adapted ability accumulation can be adapted amid a few volts and 15V with P1 and with P2 acclimatize the high absolute ( 15.0V ). R6 amount is 0.7V / Imax area Imax is the best current. At Imax = 5A, R6 is 0.14Ω
T1 and T2 charge accept heatsinks because ability losses are abundant at a low achievement voltage and a Imax according accepted but you can affix the lamp L to abate this losses.
I’ve body this adjustable ability accumulation and works great! I achievement you’ll adore it too and accept fun body this abundant counterbalanced ability supply.
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