Here this circuit is based on the principle of audio amplification using operational amplifier and pulse width modulation using 555 Timer. In this article we are describing the principle, design and ...

The purpose of the design of the circuit is to demonstrate the effectiveness of the preamplifier circuit and microphone over any audio signal. The purpose of the design of the circuit is to ...

[Alan’s] friend came to him with a problem. He loved listening to his scanner, but hated the volume differences between stations. Some transmitters would be very low volume, others would nearly blow ...