The speed indication of this circuit is made on an analog instrument. The circuit is used to count pulses (rpm) and was found in April 1976 Radio Electronics magazine.
This circuit uses a symmetrical power supply, and the motor is for the voltage indicated in the...
We found this circuit in an old documentation, but it is still current. General purpose...
The circuit exemplified in figure 8 is suggested by National Semiconductor and is based on an...