LM317 variable voltage regulator circuit LM317 Tutorial: These two diodes protect the IC from damage by providing an alternate path to the high current.įinally, a 470uf capacitor is used in parallel to make the output more stable. If a wrong high voltage supply is given to the IC, it may get damaged. Two 1N4007 Diodes are connected to the IC in the reverse direction. Pin number 3 is the input terminal and 2 is the output terminal, while the first pin is the adjust pin.
A 10kohm potentiometer is used to vary the voltage at adjust terminal of IC.
The output voltage depends on the voltage divider circuit formed by the 220ohm resistor and a 12kohm resistor. This three-terminal IC can regulate output voltage from 1.25V to 37V. Capacitive filter:Ī capacitive filter of 1000uf filters out most of the ripples from the output of the bridge rectifier. It converts sinusoidal AC input to a unidirectional DC pulsating voltage which is not stable and contains ripples. It steps down 220V AC to 24V AC having lesser amplitude. This circuit is consist of the following components Transformers:
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