Found in American documentation from the 90s, this circuit uses TTL technology and is therefore compatible with microcontroller drives. The circuit must be powered by a 5V power source.
This circuit locks when the sensors are opened. The relay can be 6 or 12 V depending on the power...
The indicator instrument of this transistor tester, from an Argentine publication of the 1970s,...
Found in American documentation from the 90s, this circuit uses TTL technology and is therefore...