This circuit turns off a load after an interval of 8 to 80 seconds adjusted on the potentiometer. The circuit is from a Radio Electronics June 1970. The time depends on C1 and can be changed.
This stage circuitry for amplifying microphone signals makes use of germanium transistors as indicated...
This transmitter emits signals in the FM range, reaching a few meters away. The modulation...
This circuit generates signals with precise intensities for oscilloscope calibration. The circuit,...