Passive tunable filter (CB7407E)

Found in American documentation from the 1980s, this circuit is a basic signal rejection filter network using only passive components.

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Debouncer (CB20546E)
This anti-ringing circuit was found in an English documentation from 1996. The integrated circuit is...
Higher gain stage (CB25057E)
The figure shows how to increase the gain of the amplifier stage of the previous circuit. The...
Voltage Controlled Function Generator (CB18882E)
This circuit uses unusual operational amplifiers, but equivalents can be tried. FETs can also be...