This circuit is from 1999 documentation. The integrated circuit used is not very common today. Both transistors are used if the motor current is greater than 500 mA.
Using the CMOS 4001 we found this circuit in the October 1974 Radio Electronics magazine. The...
This circuit for testing sources up to 10 A was found in the magazine Radio Electronics Special...
This bridge-biased transistor test circuit measures gain in the range 0 to 300. Circuit is from...