This circuit is from an 80's Radio Electronics. It triggers a load powered by the power grid from the audio signal captured by the microphone.
This circuit, from a 2005 documentation, brings together in a single device a mixer and a...
We found this circuit in a 2002 documentation. This die shows numbers 1 to 6 on a common anode...
We found this circuit in the October 1991 issue of Radio Electronics magazine. The circuit uses...