DC motor speed stabilizer. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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The traditional circuit of the DC motor shaft speed stabilizer in portable cassette recorders, implemented on two transistors or on a transistor microassembly and one transistor, has been used by our industry for more than 15 years unchanged. Modern radio elements make it possible to build speed stabilizers that are simpler in terms of circuitry, but with more advanced characteristics.
In the proposed version of the stabilizer, only six radio elements were used (not counting the electric motor), but it was possible to achieve higher stability when the ambient temperature and the voltage of the power source changed. The supply voltage range for this circuit is 6...20 V.
If it is necessary to shift the speed control range to the region of low revolutions of the motor shaft, change the polarity of the zener diode or replace it with another one with a lower stabilization voltage.
The value of the resistance of the resistor R3 depends on the resistance of the armature circuit (Rya) of the motor used and is approximately equal to 1,5 Rya.
Instead of the K140UD6 microcircuit, the operation of the K140UD7 was checked. The KT815A transistor can be replaced with KT815 and KT817 transistors with any letter index. Trimmer resistor R1 type CP5-2.
Author:P.Leonenko
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