Low frequency multiplier (CB8239E)

This circuit was found in a 90s Electronic Design. The integrated circuits are from that time. Frequency multiplication can be done for odd integers.

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Noise canceler (CB8774E)
Suggested by the 90s ARRL Handbook edition, this circuit aims to reduce or cancel noise at the...
Oscillator and Divider up to 16,384 using the 4060 (CB385E)
The frequency of a XTAL (up to 1 MHz) can be divided by powers of 2 up to 16,384 using the CMOS IC...
3.5 MHz Loop Antenna (CB4758E)
This loop antenna was found in a 1990s documentation. The circuit includes a field strength meter. The...