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Friday, December 27, 2013

Burglar Alarm With Timed Shutoff Circuit Diagram

When SI (sensor) is closed, power is applied to U2, a dual timer. After a time determined by C2, CI is energized after a predetermined time determined by the value of C5, pin 9 of U2 becomes low, switching off the transistor in the optoisolater, cutting anode current of SCR1 and de-energizing Kl. The system is now reset. Notice that (i6x C2) is less than (R7xC$). The ON time is approximately given by:(R7xC5)-(R6xC2) = Ton

Burglar Alarm With Timed Shutoff Circuit Diagram

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Tuesday, August 13, 2013

Latest British Police Car Siren circuit Schematic With explanation

British Police Car Siren circuit diagram

This is the sound generator which will simulate British police car siren. The circuit is built using 2 pieces of timer IC 555 to generate sound frequency.

How the circuit work:

The 555 on the right is wired as an alarm sound generator and the second 555 timer on the left is a 1 Hz astable multivibrator. The output of the left timer is to modulate the frequency of the right timer. This process will cause the right timers frequency to alternate between 440Hz and 550Hz at a 1 Hz cyclic rate. The transistor 2N3055 is used to amplify the sound signal to the loudspeaker. This circuit should be nice for newbie hobbysts.

Tags: british police siren, electronic siren, police car siren, police siren, police siren circuit diagram,

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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

C4 = 10uF
C5 = 2200uF
C6 = 47uF

C7 = 100uF

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Wednesday, June 12, 2013

UM3561 based 4 sound effect generator circuit schematic with explanation

This is a really simple sound effect generator based single sound generator chip UM3561. The UM3561 will generate four kinds of sound effects. The basic operation is that the UM3561 will generate the sound signal, then the signal delivered to 2N3706 (as speaker driver) to be amplified so you can hear the sound from a speaker.

Each switch position will generate the follofing sound effect:

position 1 –> Police Siren
position 2 –> Fire Engine Siren
position 3 –> Ambulance Siren
position 4 –> Machine Gun

Download the UM3561 datasheet for sound effect generator circuit reference:
» Download Link

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Car Horn circuit schematic with explanation

The following diagram is the schematic diagram fo Car Horn, you may try this circuit for your car modification…

Components List:

R1 = 68K
R2 = 2K2
R3 = 56K
R4 = 3K3
R5,R6 = 4K7
R7 = 10K Pot/trimpot

C1,C2 = 22nF
C3,C5 = 100nF
C4 = 1nF
C6 = 220µF/25V
IC1,IC2 = 7555 or TS555CN CMOS Timer ICs
IC3 = TDA7052
SPKR = 8 Ohm

Car Horn Circuit Description:

This car horn circuit reproduces the sound of contemporary vehicle horns. It had been mainly created for models and toys but, applying a high output energy audio amplifier IC, it could be implemented as well in further complicated projects.
Circuit operation

To receive a realistic automobile horn sound, two different tones mixed collectively are essential and the interval they’ll type ought to be a so known as minor third (in musical terms). This can be implemented by two 7555 CMos Timer ICs wired as astable multivibrators and generating a square wave of about 440Hz and 523Hz respectively. These frequencies ought to be quite precise, so the uncommon values necessary for your timing resistors are obtained by wiring two common worth resistors in series.

The square wave frequencies produced by IC1 (440Hz) and IC2 (523Hz) are mixed via R5 and R6 and shaped by C3, C4 and R7 in order to obtain a far more realistic tone. The resulting composite audio signal is ultimately sent for the audio power amplifier IC3 which, in turn, drives the loudspeaker. R7 needs to be adjusted to acquire a satisfactory output level.

Car Horn Circuit Notes:

The loudspeaker may be of any form and diameter. Certainly it need to withstand a energy of at the least 1 Watt if the TDA7052 Audio power amplifier IC is chosen.
The TDA7052 IC was used since it permits a minimum parts count and very excellent functionality. Wanting to make use of a distinct audio power amplifier IC, you are able to pick the much less effective but straightforward to find LM386 (see the Cuckoo-song Generator project).
In any case, try a great sized device, as a way to receive finest outcomes.
Needing a a lot more effective amplifier chip, it is possible to use the TDA2003 10W Car Radio Audio Amplifier IC or the TDA1516BQ 24W BTL Vehicle Radio Power Amplifier IC .

Source: RedCircuits

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Friday, April 12, 2013

Battery Switch With Low Dropout Regulator

In the form of the LT1579 Linear Technology (www.linear-tech.com) has produced a practical battery switch with an integrated low-dropout regulator. In contrast to previous devices no diodes are required. The circuit is available in a 3.3 V version (LT1579CS8-3.3) and in a 5 V version (LT1579CS8-5), both in SO8 SMD packages. There is also an adjustable version and versions in an SO16 package which offer a greater range of control and drive signals. The main battery, whose terminal voltage must be at least 0.4 V higher than the desired output voltage, is connected to pin IN1. The backup battery is connected to pin IN2. The regulated output OUT can deliver a current of up to 300 mA. The LDO regulator part of the IC includes a pass transistor for the main input voltage IN1 and another for the backup battery on IN2.

Battery_Switch_With_LDO_Regulator_Circuit_Diagramw

The IC will switch over to the backup battery when it detects that the pass transistor for the main voltage input is in danger of no longer being able to maintain the required output voltage. The device then smoothly switches over to the backup battery. The open-drain status output BACKUP goes low to indicate when this has occurred. When neither battery is able to maintain the output voltage at the desired level the open-drain output DROPOUT goes low. The LT1579 can operate with input voltages of up to +20 V from the batteries. The regulator output OUT is short-circuit proof. The shutdown input switches off the output; if this feature is not required, the input can simply be left open.

Streampowers

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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]

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Monday, April 8, 2013

Complete your home theater setup with home theater seating

After a full day of work and mind bubbling activities in the workplace, the last entry in a young professional’s diary is to go to a movie theater to relax. The sight and sound of a movie theater relaxes and easily entertains even the most stressed moviegoer. The problem with this however is the fact that even before you reach the movie theater, traffic jam may be a hindrance to your enjoyment. Traffic jam usually makes you more stressed than you currently are. It may be best if you can bring home the relaxation and entertainment. Having to sit and relax with your spouse in your own home theater maybe best to eradicate the tiredness that you feel.

This is why the concept of home theater is born. Because of the growing popularity of home theater systems, you may easily find home theater furniture like home theater seating system and home theater equipments that will suit your requirements. This modern concept is slowly receiving a grand welcome from people because in the end, having home theater set up in your home may prove to be economical. Home theater system including home theater seating that completes the set up is not only available for the rich and the famous.

Slowly, the knowledge of the basic home theater design such as the three major components and home theater seating options is getting to be a concept known to the middle class citizenry. Home theater system with the addition of home theater seating options may be a neat gift of the older people because they can enjoy watching movies even without having to leave the house. Home theater seating options include lumbar back support and motorized reclining mechanism, especially designed for people who need to give their back a rest.

It may be worthy to mention what are the three basic components of a home theater system. You may not need to add home theater seating if the room is quite small, only the three basic components may be able to give you that home theater entertainment you long for. Do not mind home theater seating if you do not have big budget for the home theater system, a recliner may do the part especially if your living room has limited space. The three basic components of a home theater system are television set which should not be smaller than 27 inches; three speakers placed on the right, the left and on the center for a surround sound; and finally, the DVD player, you may need to find one with progressive scan because this will give you sharp images and flicker-free pictures. If you have all these basic home theater components, even without home theater seating, you may be able to experience the almost theatrical experience.

Relax and enjoy the entertainment your home theater system may provide. Sit beside your family in your home theater seating designed to your whole family, the kids will surely love to see a movie with you on your very own home theater system. You may not need home theater seating to complete the set up if the room is quite small. However, if you have a bigger room for your home theater system, including the home theater seating in the set up may be able to complete the best home theater package. You may even add television cabinet to compliment the design and your home theater seating which may be made of the same wood as your television cabinet.

Additionally, because the basic three speakers’ requirement is only good for smaller rooms, if you have a bigger room, you may need to add more speakers. You can even put six speakers and a subwoofer to complete that surround sound you love in a movie theater. All these will complete the grand package of your home theater. You may need to consider high-end home theater seating to help you relax you tired body from working all day. Relax and enjoy life with your family, your home theater system may do a lot of good for you.

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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.

Parts List

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

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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 Audio Amplifier with Bass boost 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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