This circuit tests the offset current of an operational with the aid of an oscilloscope. The circuit is from an Electronic Design from the 90s.
This amplifier with very high input impedance was suggested by Texas Instruments in a manual of...
Using only a ULN5804 integrated circuit, stepper motors up to 500 mA can be controlled from TTL...
Constant current sources are used in applications such as battery chargers, electrolytic tanks, etc....