We found this circuit in an old documentation, but the components used offer no difficulty in obtaining it. The CMOS integrated circuits are powered by a 6V supply.
It is an electronic capacitor where the capacitance "seen" by an external circuit connected to...
We found this circuit in an American documentation from the 90s. Through an LED it indicates the...
This circuit trips, changing state, when the input voltage exceeds a value determined by R1 and...