Square sawtooth converter (CB8926E)

We found this circuit in a 1967 American documentation. The diodes are general-purpose and the input frequency can be between 80 and 800 Hz.

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Water Alarm (CB12275E)
This flood or humidity alarm was found in an English publication in 1991. It can still be fitted...
Narrowband Audio Filter (CB20085E)
We found this circuit in an old American publication from the 1980s. Transistors can be...
Bistable 7400 (CB19314E)
This TTL bistable or flip-flop with the 7400 was found in an 80's publication. It is a didactic...