Using 5 V relays, this circuit can be used as a control shield for microcontrollers. The circuit uses relays, and the motor voltage is independent of the control voltage.
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...