This flasher for incandescent lamps was found in Radio Electronics magazine from July 1968. The frequency and duration of the pulses are adjusted in R1 and R3 depending also on C1.
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...