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Circuit 211: Discreet 7.4V Zener diode
Setup information
Install the two transistors and the five resistors as shown in Fig. 2.211. The eleven jumper wires come next.
Check the placement on the board again and only then connect the battery.
Experiment
This circuit delivers constant voltage at the output, even if battery voltage is fluctuating. It behaves just
like a properly wired Zener diode . In our case, we have an output voltage of 7.4 V. The battery voltage may
fluctuate between 8V and 9V.
The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.211.
236
Components required:
1 x 2N3904 transistor,
1 x 2N3906 transistor,
2 x 1 kΩ resistors,
2 x 10 kΩ resistors,
1 x 100 kΩ resistor,
1 x breadboard, 1 x 9V
battery with clip con-
nector
Fig. 2.211: Active 7.4V Zener
diode
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