This power supply circuit was obtained from the February 1993 Radio Electronics magazine. The integrated circuit and power transistors must be provided with heatsinks.
This polarity test or indicator indicates the polarity of a power line by LEDs. The circuit is...
This is the circuit of a digital clock published in the January 1975 issue of Radio Electronics magazine....
Found in an Elektor from the 90s, this circuit can be powered directly by the power grid. The...