High Frequency VFO (CB21141E)

Found in Popular Electronics from the 1990s, this variable frequency circuit generates signals in the shortwave range. FETs admit equivalents.

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High Speed Single Pulse (CB6351E)
This high-speed circuit was found in 1980s Linear Technology documentation. The circuit makes use...
TwoTransistor Amplifier (CB987E)
The transistors of this amplifier for 8-200 headphones may be the BC548 or equivalent to replace...
Pulser with relay (CB23666E)
The frequency of this pulser depends on the capacitor and the characteristics of the relay. The...