Frequency meter (CB7383E)

Found in a Popular Electronics from the 90s, this circuit reaches 100 kHz and battery power is recommended.

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Current Source For Electromagnet (CB1163E )
The purpose of this circuit is to provide a constant current to an experimental electromagnet. The...
Two-phase motor control (CB7269E)
Suggested by Sprague in the 90's documentation, this circuit applies to AC motors. The...
Digital Voltage Indicator (CB25335E)
This indicator with the integrated circuits CA3162E and 3161E was published in the July 1990 issue...