Hughes suggests this circuit in a 1968 documentation. The circuit uses old transistors that can be replaced with equivalents. MOSFET is the critical component of the circuit.
This configuration has already been given in several articles and circuits on this website and...
This circuit is from a Harris Semiconductor datasheet from the 80s. However the circuit can be...
We found this logic level tester in a 1976 documentation. The circuit is powered by the voltage of the...