Recommended for automotive applications, this circuit was found in an April 1982 Radio Electronics magazine. The transistor supports equivalents. Sensitivity adjustment is made by R1.
This digital indicator circuit was found in the June 1988 issue of Radio Electronics magazine. The circuit...
This circuit is from a Popular Electronics from the 90s. The circuit has a tone frequency...
This circuit serves to receive optical signals modulated in amplitude providing an audio signal at its...