This circuit limits the intensity of an audio signal from a control voltage. The circuit is from a 90’s Radio Electronics. The coupler is a type that uses LDR.
This circuit is from an Argentine publication from 1973 but can be assembled with BC558 and BC548...
This two-stage amplifier circuit with RC coupling was obtained in a 1977 Radio Handbook. The...
This control for motors up to 1 A was found in a Siliconix documentation using its own component....