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DC motor speed controller

I will introduce the constant speed controller for DC motor.
It detects and controls the rotational speed of the motor. When lower than the specification speed, it increases a control electric current. When higher than the specification speed, it reduces a control electric current. It is possible to use when wanting to keep constant speed even if the load to the motor changes.
With the circuit this time, I used a motor for the speed detection apart from the main unit motor. The speed can be detected in the other way, too. LEDs are lit up to confirm the control situation of the motor.
A circuit like "Light controller" is used for the control unit of this circuit.

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