This circuit is from a 90s American documentation. The circuit can use complementary pairs according to the power. The power voltage can be between 5 and 12 V.
The circuit in the figure uses two of the 4001's four gates to trigger a relay in a timed manner. The...
Found in a 90s Popular Electronics, this circuit aims to find the voltage of a zener diode up to...
Picoammeter (CB9661E) This circuit is designed to measure very weak currents, in the order of...