Based on an integrated circuit of the time, this circuit appeared in the October 1979 issue of Radio Electronics magazine. The circuit monitors voltages in the range of 10.5 to 16.0 V.
Using 4 operational amplifiers this circuit generates 4 different tones. The circuit is from an...
In the figure we have an application of an oscillator 4013 as voltage multiplier. It consists of a...
This Colpitts crystal oscillator was found in an American publication for amateurs in the 1980s....