Express Battery Tester without Power Supply by 555 Timer

The circuit was designed without the use of a power supply or a moving coil voltmeter to create a quick battery tester which can test 1.5 V to 15 V battery cells with a two-LED display.

LM3886 Based 300W Audio Power Amplifier Project

Full audio power amplifier project based on six LM3886 high performance ICs providing 300 watts of power into 4 Ohm speakers.

Bass Boosting Audio Amplifier

The design of the circuit aims to create an audio amplifier that would provide more attention to the boosting of bass frequency while giving a power of 10 Watts into 8 Ohms load.

Touch Controlled Capacitive Sensor Circuit

The circuit was specially designed for shop windows animation as it makes use of a capacitive sensor that is triggered by touch control system.

Breathe Out Operated Electronic Candle

The amusing circuit of electronic candle was designed to react by blowing or giving a puff to a microphone, causing the bulb or LED to turn OFF like a normal candle.

Equipment Indicator Using Two LED

This simple circuit aims to provide an indication of an appliance if it is ON or OFF with the use of green and red LEDs.