Suggested by an American publication of 1964 this circuit is intended for the capture of signals from film tracks recorded by optical systems, common at the time.
This configuration based on a conventional astable multivibrator was found in a 1982 publication. The...
Operational amplifiers used in this 80's circuit is not very common today, but the setting can be...
This circuit was found in an Electronic Design from 1967. The circuit uses two triacs being T2...