This circuit is based on the light comparison of two LDR sensors. We found it in a 90s Popular Electronics. The transistor must be according to the indicator or load being driven.
In this phase shift circuit, the transistor can be any general-purpose transistor. The circuit is from...
This simple circuit was obtained from Popular Electronics in December 1990. The magazine no longer...
This circuit was found in an old American documentation. Its purpose is a proportional scanning signal...