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.
Found in a Hands On Electronics of the 80s, this circuit makes use of an integrated circuit of the time...
We found this automotive alarm circuit in a 90's Popular Electronics circuit. The circuit emits a...
This circuit uses a phototransistor as sensor. The changes in the resistance of the transistor,...