Economical voltage stabilizer 15/5-12 volts 100 milliamps. Scheme, description

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Economical voltage stabilizer 15/5-12 volts 100 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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The features of the stabilizer, the circuit of which is shown in the following figure, are the ability to operate at a reduced input voltage (15 V) and a relatively low own current consumption. This allows us to recommend it for self-powered equipment. The output voltage of the stabilizer can be adjusted by a variable resistor R4 in the range from 5 to 12 V. Thanks to the use of a field-effect transistor V1 and a high-resistance load in the regulating element, it was possible to obtain fairly good characteristics: a stabilization coefficient of more than 200, an output resistance of 0,3 ... 1,5 Ohm at maximum load current up to 100 mA.

Economical voltage regulator 15/5-12 volts 100 milliamps

A current stabilizer is assembled on transistor V4, which plays the role of an economical source of exemplary voltage. The minimum allowable voltage drop across the control transistor V2 is 1,5 V (at a load current of up to 30 mA). The maximum load current can be increased by replacing V2 with a more powerful one. It is allowed to replace the transistor V4 with a resistor with a resistance of 2 ... 5 kOhm, and the resistor R4 with a KS133A zener diode, i.e. replacement of the current stabilizer with a conventional parametric stabilizer. However, this will significantly increase the current consumed by the stabilizer. According to the indicated scheme, it is possible to assemble stabilizers for an output voltage of up to 30 V, respectively selecting (in the direction of increase) the values of the resistors R2, R3, R4.

Publication: cxem.net

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