24 Hour Clock (CB6462E)

This circuit divides the grid 60 Hz frequency to obtain 20 Hz to drive mechanical watches used at the time. The circuit is from a 1970 CQ magazine.

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5 MHz oscillator with 250 kHz variation (CB13852E)
We found this oscillator in a documentation for radio amateurs from the 1970s. The circuit can use...
Impedance Matcher (CB15540E)
Many oscilloscopes have high impedance inputs that make it difficult to observe high frequency signals...
Optical Communicator – Receiver (CB25536E)
This is the receiver for the previous circuit we found in the December 1992 Radio Electronics...