This circuit of a Popular Electronics from the 90s makes use of components of the time. The circuit has sampling and retention capabilities and a conversion rate of 1V / kHz.
This circuit controls the passage of the signal from an input to an output using a DC signal from a...
This audio level indication system for microphones was found in Radio Electronics from the 90s....
This 5-range current measurement circuit was found in the September 1989 issue of Radio...