ZENER Diode - 4 |
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THE
STABILIZING ZENER The experiment suggested through the outline of figure 5 must begin with the cursor of potentiometer the R2 completely rotated towards the line of negative feeding to 9 V, so that diode zener DZ remains shorted and the voltage, on its terminals, is of 0 V.
Fig. 5 - Through this simple circuit he is easy to interpret the behavior of a diode zener correctly inserted in the outline, with polarization invert.
Components:
Therefore
it is begun to slowly rotate the hinge of R2 towards the R1 resistance,
that is towards the positive clip of the local p0wer source and the
behavior of the index of the tester is observed, that it must commutated
in the function of voltmeter for d.c. voltages and on the 25 V deep-scale. One will also notice to us that the voltage knows them
from the zero begins them until catching up the value of 5,6 V. From
which more does not bear away, continuing to speed up in its race the cursor
of R2. And this is the effect provoked from diode zener
DZ, for which a model with voltage zener of 5,6 V has been chosen
obviously.
Fig. 6 - Practical outline of the demonstrative experiment of the behavior of a diode zener inversely polarized. It aims them positive of the tester goes connected with finishes centers them them of potentiometer the R2 (cursor) .
In
the practical current, replacing the tester with a loaded electrical
worker, this it would come constantly fed with the voltage of 5,6 V,
also assuming that one of feeding the value of 9 V maximums and being
able also to vary in the time (maneuvers on the potentiometer). If the diode zener comes inserted in the same circuit of figure 5 with directed polarization, like marked in the outline electrical worker of figure 7, the semiconductor is behaved like a whichever diode , that is in the way already analyzed in the outline of figure 1, in which the voltage remains stabilized on the value of 0,7 V.
Fig. 7 - In this circuit, in which the diode zener is inserted with direct polarization, that is with the anode turned towards the line of the positive voltage and the cathode towards that negative, the semiconductor is behaved as a silicon diode.
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