This circuit was found in the May 1982 issue of Radio Electronics magazine. The circuit inverts the polarity of a power supply to obtain a voltage of -5 V.
This latching alarm circuit using relays was found in American documentation. Sensors are...
Pressing and releasing S1 remains one of the neon lamps. Which one will be, it is not possible to...
Found in an Electronic Design, this small power source uses a battery as a voltage reference,...