Suggested by an Electronic Engineering, this circuit uses components of the time. Modern equivalent components can be used according to the motor current.
This circuit is from a 1978 Texas Instruments optoelectronics manual. The trimpot adjusts the LED...
This circuit with the ICL8068 was taken from an article in the February 1981 Radio Electronics magazine....
The circuit presented is from 1994 and can be developed with more modern operators. We found the...