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 is the circuit of a hearing aid amplifier manufactured by Sony in the 1960s. The circuit was...
Here we show a configuration in which we have a control voltage applied from a voltage divider, which...
This circuit was found in Motorola's 1968 documentation. The SCRs are then replaceable with...