Signal Meter Circuit


Posted on Feb 6, 2014

The CA3189 IC integrates a symmetrical limiter, a phase demodulator, an audio amplifier, and a logarithmic detector-amplifier. The logarithmic detector-amplifier is the most interesting part of the IC for the above featured circuit. It can be used to enhance the logarithmic signal meter  of shortwave receivers to make the signal reading more acc


Signal Meter Circuit
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urate. Building the circuit is very simple. It must be built in such a way that it will work up to 30 MHz. To do that, follow these guidelines: connect the input to a 50 © line; make the circuit wiring as short as possible; and the input signal must be shielded.




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