Scratch Filter (CB6655E)

We found this circuit in a Radio Electronics. The circuit can be seen elsewhere on this site. The supply is made with relatively high voltage.

Alternate Action Switch (CB145)
This circuit turns on and off when a short pulse is applied by SW to the input of the first...
Modulated Voltage Regulator (CB6292E)
This circuit was found in a 1970 US publication. Transistors are still common and the circuit can be...
CMOS Touch Key with Lock (CB1275E)
This circuit locks after a short touch on the sensor. The circuit can be powered by voltages from 5...