Saturday, August 18, 2012

Electronic Stethoscope Circuit

This is an electronic stethoscope circuit diagram. The operation of the circuit is very simple. It's work is similar to general home audio system. The heartbeat sounds catched by electret microphone and then the amplifier amplify the signal.

Thursday, May 24, 2012

Simple Pre-Amp with One Transistor

Simple Pre-Amplifier circuit with One Transistor

This is a very simple pre-amp circuit which use a transistor as a active component to boost the input signal. Its simplicity makes this circuit easy to built and inexpensive. The microphone used in this circuit is electret type which is very sensitive detecting the sound around its.

Sunday, April 22, 2012

Stereo OTL Audio Amplifier

The following diagram is the circuit of Stereo OTL Audio Amplifier. It based on IC circuit, so the circuit looks simple. You can use IC LM379,LM377,LM378 for this amplifier project.

2x6W Stereo OTL Audio Amplifier circuit diagram