This circuit was found in a 1980s documentation for amateur radio. The circuit is for 9 MHz signals and values in parentheses for FI of 455 kHz. The circuit can be adapted to other frequencies.
The input frequency of a signal applied to this circuit will be divided by one to 9999 in this...
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This configuration triggers an external circuit or simply an LED for time given by R1 and C1 (T =...