This circuit for incandescent lamps was found in the February 1972 Radio Electronics magazine. The triac is rated according to the lamp power and the sensitivity adjustment is made in R1.
This simple circuit makes it possible to test diodes and transistors for generating use and medium...
This 2.5 A power supply was found in a 90's QST magazine. The power transistor must be mounted on a...
This circuit is a digitally controlled variable capacitor. We found it in American documentation from...