Posted on Aug 6, 2012

The untuned, but amplified FSM can almost sense that mythical flea`s whisper-from 3 through 148 MHz no less-and yet, is so immune to overload that the meter pointer won`t pin. The key to the circuit is the amplifier, a 324 quad op amp, of which only one section is used.

Click here to download the full size of the above Circuit.

It"s designed for a single-ended power supply, will provide at least 20dB de gain, and the output current is self-limiting. The pointer can"t be pinned.

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