Found in an American documentation from 1969, this astounding circuitry makes a relay operate on 3 Hz cycles. The relay is of the high voltage type of the time.
In the figure we have a configuration that allows to test NPN transistors and with the addition of a...
We found this circuit for 330 MHz using PIC in the magazine Electronics Now of December 1994. The...
We found this battery monitor in a 2005 Linear Technology application manual. The circuit uses...