simple stabilizer
Encyclopedia of radio electronics and electrical engineering / Surge Protectors
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In amateur radio practice, there is often a need for a laboratory power supply that regulates voltage from almost zero. Similar devices have been repeatedly presented on the pages of the magazine "Radio". However, in most cases they are quite complex. Below is a variant of a simple stabilizer for a laboratory power supply (see diagram).
The function of the regulating element is performed by the composite transistor VT2VT3, which is controlled by the op-amp DA1. A voltage proportional to the output is applied to the inverting input of the op-amp, and part of the exemplary variable resistor R7 from the engine is applied to the non-inverting input. This resistor regulates the output voltage of the stabilizer.
The device provides protection against exceeding the load current of the set value. When overloaded, the voltage drop across the sensor - resistor R1 (C5-16V) - increases, the transistor VT1 opens. LED HL1 signals the inclusion of protection. In addition, the voltage through the R4VD1 circuit is supplied to the inverting input of the op-amp. As a result, the stabilizer enters the current limiting mode at the set level. The value of the overload current is regulated by a tuning resistor R3.
The control transistor must be installed on a heat sink with an area of at least 250 cm2.
To increase stability, you can replace the resistor R6 with a current stabilizer 10 ... 20 mA on a field-effect transistor.
Author: Yu.Shipanov, Penza
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