Found in a 90's EDN, this circuit can be used as a shield. The components depend on the MOSFETs and the load that must be controlled. The logic is TTL.
Disabling this circuit from a 2002 documentation can only be done by pressing 4 keys in a correct...
This circuit was found in a 1979 magazine. We can use any JFET like MPF102 or BF245. The relay is 12 V...
This circuit was obtained in a 90’s documentation. The operational amplifiers are from that time....