This circuit was found in documentation from the 90s, being indicated for the deflection of cathode ray tubes. It consists of a DC voltage amplifier and operates at frequencies up to 1 kHz.
The phototransistor can be of any type and the adjustment potentiometer 4M7. This circuit was...
We found this circuit in a Popular Electronics from the 90s. Its purpose is to monitor a power...
This configuration can be made based on other operational amplifiers. For other frequencies, the...