MINI MICROPHONE PRE-AMPLIFIER USING LM358

This is easy to construct microphone pre-amplifier project using compact electret condenser microphone. The pre-amplifier is important building block of many audio communication systems. Circuit has been built around Op-Amp LM358.    Power supply : 5 to 12 VDC @ 10 mA  Output: Gain Approx. 100  On-Board electret condenser microphone   Header connector for connecting of power supply input and audio

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4 Channels Optically Isolated I/O Board Using 6N137 Optocoupler

4 Channel Opto isolated board has been designed around 6N137 Opto-coupler, the 6N137 optocoupler is designed for use in high-speed digital interfacing applications that require high-voltage isolation between the input and output. Applications include line receivers, microprocessors or computer interface, digital programming of floating power supplies, motors, and other control systems. The 6N137 high-speed optocoupler consists of a GaAsP light-emitting

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