This motor speed control with tachometer sensor was found in the 1993 Radio Experimenter Special Projects. The maximum current is 2.4 A.
This circuit generates a pulse of approximately 1 second when the light incident on the sensor...
The 3403 operational amplifier is not common today, but the configuration can be implemented with...
This circuit, published in 1978, can use any general purpose NPN transistor such as the BC548 and...