This small control for DC motors up to approximately 1 A uses an operational amplifier that admits equivalent. The transistor can be TIP29 for currents up to 1 A or BD135 for 500 mA.
This circuit was found in a 1977 American manual. The integrated circuit is from the time....
Using an integrated circuit from the time, this circuit was found in Radio Electronics from the...
This circuit shows how to use common logic functions to divide a frequency by 7. The output signal...