Universal speed control (CB20783E)

This control, which may appear in other versions on this site, was found in documentation from the 1970s. SUS is an uncommon component today.

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Variable range moving point (CB25154E)
The figure shows how to use an LM3914 with a variable range moving point. The circuit has an...
Voltage-tunable VFH oscillator (CB9430E)
This circuit was found in a 90s Popular Electronics. It uses a varicap that admits equivalents. The...
500 Hz to 5 kHz OA oscillator (CB10490E)
This circuit is from an Electronics Now from 1998 and can be easily assembled with other JFET...