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Field-Strength Meter |
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| 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. It's designed for a single-ended power supply, will provide at least 20-dB dc gain, and the output current is self-limiting. The pointer can't be pinned. | ||
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