With the configuration shown in the figure, we have the relay being activated when the microphone picks up a sound and shutdown when the X1 reset sensor is activated.
This circuit was found in a 1967 RCA manual. The transistors are of the time. The adjustment is made to...
The L coil of this field strength meter depends on the frequency range in which it must operate. The...
This adjustable regulator uses the 741 and power transistors and can supply a current of up to 1...