This circuit allows the listening of undersea sounds using a special transducer. Operational amplifiers can be of any type. The circuit was found in a Popular Electronics from the 90s.
We found this interesting bistable photoelectric control circuit in a 1988 documentation. The...
The integrated circuit used in this oscillator is no longer common in our market, as the...
This circuit was found in a 1970s documentation. The integrated circuit used is uncommon today....