We found this circuit with duty cycle adjustment in the May 1988 Radio Electronics magazine. The source must be symmetrical, and the frequency given by R3 and C1.
Using one unijunction transistor and two bipolar transistors, this circuit generates a signal from...
This circuit was found in an American 80s circuit manual. The components used are unusual. The...
We found this circuit in 1969 American documentation. FETs admit equivalents, as do transistors. The...