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.
This non-inverting AC amplifier was found on a Popular Electronics. The setting applies to any...
This circuit was found in an old American publication. It makes use of an integrated circuit...
This photoelectric circuit was found in a 70’s Ferranti's documentation. The circuit uses an...