LM3900 Rectangular Oscillator (CB25179E)

This 1 kHz oscillator uses a Norton LM3900 operating system. The frequency depends on C1 and R1 and can be changed.

Digitally Controlled Oscillator (CB18268E)
We can control the frequency of an oscillator from digital circuits or from the output of a...
Dimmer with triac (CB26092E)
We recommend adding a 470-ohm resistor in series with the potentiometer in this dimmer circuit...
Automatic Gain Control for Recording (CB24224E)
We found this circuit for old tape recorders in the December 1972 Radio Electronics magazine. The...