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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LM3909 2Hz Fast Flasher (CB25424E)
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Emitter Coupled Multivibrator (CB18238E)
This different than configurable configuration uses transistors coupled by the emitter. The...
Dalayed Turn-On Gate (CB123)
This circuit can be used to add a delay to a logic signal as shown by the input and output...