The circuit is from a Radio Electronics magazine from October 1987. The Triac must be equipped with a heatsink and the transistors are general purpose.
Found in a 90s Popular Electronics, this circuit generates high voltage for radiation detecting...
In this circuit found in the December 1972 Radio Electronics magazine. R can be from 1k to 22k,...
This circuit allows you to vary the duty cycle without changing the frequency. An interesting...