We found this relaxation oscillator in a 1967 General Electric documentation. The frequency is given by the capacitor. The obtained waveforms are shown.
This simple robot or motor control circuit using a photocell as a sensor was found in the magazine...
This circuit uses an operational amplifier to modulate the light emitted by an LED with audio...
Equivalent transistors, such as the BC548, can be used in this circuit that we find in...