In this charger the current is limited by the incandescent lamp. Lamps from 40 to 100 W can be used and even connected in parallel, depending on the load.
This crystal-controlled 1000 kHz oscillator was found in 1980s American documentation. The...
This project was published in the April 1989 issue of Radio Electronics magazine. It drives LEDs...
This circuit was obtained in a magazine Hands-On Electronics of June 1987. It is a circuit that...