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May 2012

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C I R C U I T L A B

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Guitar and Microphone Amplifier Using TDA2005M (New)

This simple audio power amplifier works with guitars and microphones, delivering an output power of around 20W over a load of 4 ohms.

Versatile DC - DC Converter (New)

This versatile power coupler connects a device to 5V-19V DC generated from AC mains by a power adaptor. Sometimes the power adaptor may have a voltage rating higher than the required voltage. With the converter circuit given here, the adaptor can be used to power any device at a lower voltage.

Intercom Using LM386

Use this intercom circuit for bidirectional communication. The advantage of this circuit is that there is no talk/ listen switch as many intercoms have. The circuit is built around two low-power LM386 audio amplifiers.

Servo Motor Tester

This servo motor tester checks the working of a servo motor by feeding it pulses of varying width and checking the response angle of motor.

Dual-Color Stroboscope

This stroboscope circuit produces light pulses in two colors, red and green. Stroboscope is a device used to make a cyclically moving object appear slow-moving or stationary.

Simple Soldering Iron Temperature Regulator

This temperature regulator circuit provides manual temperature control of an ordinary 12V AC soldering iron.

Safe Cigarette Lighter Power Socket

This circuit lets you use the cigarette lighter socket to power your electronic gadgets without the fear of draining the car’s battery.

Ultrasonic Transmitter and Receiver

Presented here are the circuits of ultrasonic transmitter and receiver that use two CD4017 decade counters and ultrasonic transducers.

Laptop Audio Amplifier

This circuit uses a power amplifier IC LA 4440 and two 6 watt speakers to amplify the audio output of a laptop.

Portable Signal Wand

This is a circuit of a battery-operated, LED-based portable signal wand. The wand produces flashing lights in two colors.

Peak Level Monitor

The peak level monitor shown here can be used for testing amplifiers, digital circuits and anything that produces an output of about +7V to – 7V peak.

Audible Resistance-Checker

This is a circuit of a resistance checker which provides an audible assessment of the resistance. It tests open circuit and short circuit conditions, and checks resistance between two points.

Automatic Sprinkler Control System

Automatic Sprinkler Control System circuit is designed as an expansion module to automatic sprinkler systems. It can be fitted in place of existing solenoid in the system to add new sprinkler wires without having to update the controller or run new wiring.

Guitar Effect Pedal Power

This circuit provides solution for the guitar players who use guitar pedals. It reduces the wiring and provides all amplification and effects on a PCB. It can be used to design pedals for upto five effects.

Flasher For Deepawali

It is a circuit for a portable electric lamp and LED flasher. It contains a bulb and 9 LEDs. The bulb and LEDs glow alternately, depending on the frequency set in the circuit.

Electronic Metronome

It is a circuit for designing an electronic metronome which can generate regular beats in the range of 40 to 200 beats per minute. The tempo and the pitch can be changed by using the knobs in the circuit.

Motion Sensor for Security Light

This is a system based on PIR motion detector module BS1600 (or BS1700) that can be used for security or corridor lighting in power-saving mode. It contains a CFL that glows when it detects motion. When there is no motion, it glows for ten seconds, remains turned off for thirty seconds and then lights up again.

Bipolar Transistor Tester

This tester is primarily meant to test bipolar transistors. It can indicate the type of the transistor as well as identify its base, collector and emitter pins

Mobile Electronic Workbench

It is a circuit for a cost-effective mobile electronic workbench for testing and assembling circuits.

Computerised Morse Code Generator Transmitter

This is a circuit for a computerised telegraph which can transmit telegraph messages. The data entered through keyboard is converted into Morse code into computer using the Pascal program code given here. Then, this signal is transmitted in the form of a FM signal that can be received by any receiver tuned to the frequency of the signal being transmitted.

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