Debouncer (CB20546E)

This anti-ringing circuit was found in an English documentation from 1996. The integrated circuit is the 74LS14.

Telephone Conversations Automatic Recording (CB17296E)
This circuit automatically activates the relay when the phone is answered, closing the record...
Battery Discharger (CB23713E)
This circuit consists of a controlled charge to discharge batteries under test. The circuit is...
CMOS Logic Proof (CB5892E)
This circuit was obtained from an English publication from the 70's. The circuit is still current for...