Found in a 90’s Popular Electronics, this circuit uses a component that can be difficult to obtain today. It achieves a 10 dB noise reduction with the indicated components.
We found this circuit in a 1967 RCA SCR manual. The circuit uses components from the era. The...
A simple bistable configuration can be obtained based on just one amplifier, as shown in the...
This series sensor circuit is from 1995 Popular Electronics. The circuit can use any SCR and the...