Field-strength-meter

  
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.
Field-strength-meter - schematic

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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