CW Monitor (CB21439E)

This circuit for monitoring telegraphy transmissions was found in a 1975 CQ magazine. Transistors may be modern equivalents.

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7.5 V x 1 A Power Supply (CB1179E)
We found this circuit in a 1987 Hands On Electronics. It was indicated at the time to power...
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This high current regulator was found in documentation from 1977. Transistors are types of power at...
Frequency Doubler (CB13738E)
This circuit, obtained from old documentation, doubles the frequency of the pulses applied to the...