Triggered Oscillator (CB18275E)

The circuit shown in the figure generates a rectangular signal that depends on R and C, when its input goes to the high level.

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High Q Filter (CB25362E)
This 1/2 hertz high selectivity filter was found in the December 1990 issue of Radio Electronics...
Relaxation oscillator Using Bipolar Transistors (CB884E)
The frequency in this circuit is adjusted by P1 and given by C1. Short pulses, as the ones...
CW oscillator (CB20530E)
This Hartley telegraphy oscillator operates with the transmitter signal generating a tone in a...