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.
We found this configuration in National Semiconductor's Linear applications Handbook. The circuit...
This circuit is connected to the input of a good amplifier serving as a follower of audio signals or...
This basic oscillator with tunnel diode generates a 100 kHz signal with 1 uW output power. The...