Suggested for the control of photographic enlargers, this 1967 General Electric circuit uses still common components. The circuit directly controls a lamp for exposing negatives.
Found in a publication for radio amateurs from the 1980s, this circuit amplifies signals in the 60...
Found in 1967 General Electric documentation this circuit uses a PUT and a diac to generate 1 kHz...
This audio oscillator has its frequency determined by C1, C2 and the inductor. The inductor can be...