Transistor analogue of a zener diode. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Transistor analogue of a zener diode. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur

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If there is no zener diode for the required voltage at hand, a simple two-transistor device will replace it.

Transistor analogue of a zener diode

By rotating the engine of the variable resistor R2, the transistor VT1 is opened to a greater or lesser extent. followed by VT2. By changing the internal resistance of the transistor VT2 in this way, the required voltage value is set on it using R2.

The BC547 transistor can be replaced by any low-power silicon transistor, for example, the KT315, KT312 series, with h21e>100. and BC557 - with a medium power transistor, for example, KT814 or KT816.

In one of the magazines "Modeler-Constructor" a few years ago, a diagram of an analogue of a zener diode was published. When I needed to stabilize the "non-standard" voltage, I remembered this circuit, found its drawing in my notebook and assembled it. It turned out that she regularly performs her functions. It can be used instead of any zener diode within 3 ... 25 V.

Author: Ya.Ochakovskiy, Petropavlovskoe village, Altai region

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