Sawtooth oscillator (CB21816E)

This transistor circuit was found in Mullard's 1960s transistor manual. The transistors are germanium from the time.

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Passive Bass and Treble Control (CB25826E)
We found this passive circuit in the February 1995 Electronics Now magazine. The circuit is...
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This 1975 circuit for automotive applications replaces the mechanical vibrator found in old cars...
Peak Detector using the LM3915 (CB23673E)
This circuit was obtained from National Semiconductor's Linear Applications Handbook from 1994. The...