Transient suppressors for sensors (CB24381E)

These circuits prevent bouncing in alarm systems. The circuit indicated is for sensors connected in parallel.

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400 Hz square generator (CB8954E)
This circuit was found in a 1968 documentation. The circuit generates three rectangular signals...
Varicap Voltage Controlled Oscillator (CB13347E)
We found this circuit in an old documentation from the 70s. The circuit can use any varicap and...
Touch switch (CB9377E)
Found in American documentation from the 90's, this circuit is very current and can be implemented with...