When there is no zener diode. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Radio amateur designer
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Silicon transistors in "diode" inclusion can successfully replace low-voltage low-power zener diodes. To do this, the terminals of the base and collector are connected to each other, and the resulting "diode" is fed, as well as to the zener diode, reverse bias (Figure a).
The stabilization voltage depends on the type of transistor and to some extent on the particular instance of the transistor. For most transistors, it is close to 5...6 V.
Experimenting with various types of transistors, the author did not find any with a stabilization voltage of more than 8 V.
If the stabilization voltage obtained is less than the required one, then one or two low-power silicon diodes (Figure 6) or another transistor - the "Zener diode" (Figure c) can be connected in series with the "zener diode" transistor.
The range of stabilized currents approximately corresponds to Zener diodes with a maximum power dissipation of 400 mW.
Author: P.HAWKER
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