This circuit for a digital module was found in the September 1989 Radio Electronics magazine. The source must be symmetrical to the operational amplifier.
We can control the frequency of an oscillator from digital circuits or from the output of a...
We recommend adding a 470-ohm resistor in series with the potentiometer in this dimmer circuit...
We found this circuit for old tape recorders in the December 1972 Radio Electronics magazine. The...