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Circuits – LM386 Audio oscillator

LM386 Audio oscillator This one is excellent application of widely used audio amplifier IC LM386.Its output is square wave at no load condition. Its frequency is governed by supply voltage. It can be used as code practice oscillator, even as side tone for your qrp radio. The LM386 is an widely abused integrated circuit containing …

Circuits – Pippin QRP Transmitter

This pippin QRP transmitter is basically a conventional colpitts type crystal oscillator with output taken from a low value collector load resistor  and direct coupling is made into the base of PNP transistor used as an amplifier. This simple circuit develops around one watt output with 12V as power supply.