Found in an Electronic Design from the 80's, this circuit monitors a three-phase line, activating a relay when one of the phases is missing.
This circuit was obtained in a 1975 magazine and can be implemented with BC548 transistors. The...
The circuit presented is from the Linear Databook of Motorola of 1990. With it we emulated a NOR gate...
This circuit can generate signals from 100 kHz to 1 MHz depending on the L1 coil. For the medium...