This mono circuit for 10 LEDs was found in the January 1991 Radio Electronics magazine. It is powered by 12 V.
This filter for 100 Hz was found in a Radio Electronics of the 90s. The circuit uses a 741...
The figure shows how to obtain a locking relay for an alarm circuit with sensors in series and in...
This 1977 circuit is a simple and straightforward application of an SCR, already explored in many...