Found in Popular Electronics from the 90s, this circuit mutes a scanner's speaker in the absence of a voice signal, thus eliminating the hiss.
This circuit was found in an Electronics World of 1969. The components of the time. The...
This circuit was obtained from Linear Technology documentation from the 80's. Powered by 5 V it...
This circuit is built around a component that is not very common today. It consists of a precision...