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.
We can implement this filter with more modern equivalent operational amplifiers, since the LM110 is...
This circuit is from an October 1980 Radio Electronics magazine. The circuit indicates when the...
This circuit can be used as a shield when its supply is 5 V. in this case we can exchange the...