Motor stabilizer, 5,5-14/5 volts 150 milliamps. Scheme, description

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Motor stabilizer, 5,5-14/5 volts 150 milliamps. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Surge Protectors

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Currently, many imported car radios produced in the 80s ... 90s of the last century are ending their "life cycle".

The wear and tear of mechanics and the disappearance of compact cassettes as a carrier of audio information made it inappropriate to use car radios as a tape player, and the aging of radio elements and the difficulty in acquiring discontinued spare parts make the repair, restoration and further operation of such devices impractical.

In the tape drive mechanism of the car radio, you can find from one to three small-sized electric motors. From the electric motor designed to pull the magnetic tape, you can remove a miniature speed stabilizer board.

By a simple alteration of this stabilizer, you can get a constant voltage stabilizer. Figure 1 shows a negative polarity voltage regulator circuit.

Engine stabilizer, 5,5-14/5 volts 150 milliamps

The electronic stuffing was used from a worn-out microelectric motor type MC1-5U3LCKS manufactured in 1997.

In order for this node to work in the voltage stabilizer mode, the resistor R1 (conditional numbering) is shorted with a wire jumper.

This greatly reduces the positive current feedback when the output voltage of the regulator rises as the load current increases. In addition to the jumper, capacitors C2 and C4 are added to prevent self-excitation of the stabilizer and reduce output voltage ripple. After the upgrade, resistor R2 and capacitor C3 become unnecessary, and, if desired, they can be removed from the board. The stabilizer includes an integrated circuit with the designation on the body 6605SP. presumably AN6605SR. It is advisable to solder a small brass or copper heat sink to its heat sink flange.

The appearance of the stabilizer is shown in Fig.2.

Engine stabilizer, 5,5-14/5 volts 150 milliamps

A thin round circuit board removed from the electric motor is glued with quick-drying glue to a 50x30 mm single-layer mounting plastic. Capacitors C2 and C4 are glued with the same glue. Flat plate capacitors for surface mounting are used to keep the height of the device low.

With an input voltage of 10 V, the stabilizer consumes a current of about 4,2 mA. The output voltage of the stabilizer can be adjusted with a trimmer resistor R3 within 4,2 ... 5,8 V. When the input voltage changes from 7 to 14 V, the output voltage of the stabilizer increases by 10 mV at a load current of 200 mA. When the load current changes from 0 to 150 mA, the output voltage increases by 100 mV (with an input voltage of 10 V). Thus, the output impedance of the stabilizer is negative, which makes it possible, with an increase in the load current, to compensate for the voltage drop on the connecting wires and thin printed tracks. The thermal power dissipated by the microcircuit should not exceed 1 W.

If this stabilizer is connected to the output of a rectifier that does not have a ripple-smoothing capacitor, then the capacitance C2 must be increased by a factor of 20 ... 50. By reducing the resistance R4 and setting the trimmer resistor R3 of greater resistance, you can expand the range of output voltage adjustment. When the resistance R3 decreases, the output voltage rises.

To increase the output current of the stabilizer, you can install an emitter follower, for example, on a transistor from the KT819 series. In this case, the output resistance of the stabilizer can become positive.

Author: A.Butov, p. Kurba, Yaroslavl region

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