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.
The circuit shown was found in the 1994 National Semiconductor Linear Applications Handbook. The...
We found this circuit in a documentation for radio amateurs from 1975. The FET can be the BF245 and...
This circuit is from an old documentation making use of a 3,579,645 MHz analog color television...