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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Logic Controlled Regulator (CB25734E)
We found this circuit in the July 1994 issue of Electronics Now magazine. The circuit can use...
Square Wave Generator (CB19372E)
The transistors in this 80's documentation project may be BC548, the most modern equivalents of...
Alternator Voltage Regulator (CB6375E)
This circuit was found in an Electronic World of 1968. The circuit uses power transistors of the...