Variable Voltage Regulator

Circuit Notes

As Ron suggests, controlling the output voltage from a regulator can be made variable in three ways:-

1. Using a fixed reference zener diode to increase the output by the value of the zener

2. A variable resistor for variable output, note that a voltage less than the nominal regulator is not possible

3. A chain of diode such as 1N4001, this increases the output by +0.7 V for every diode used.

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