Wednesday, September 13, 2017

Circuit Schematic Variable Power Supply from 1.2V to 30V at 1 Amphere using LM317

Robometricschool. - This is one of the application of LM317 IC to build variable power supply for you. So, you can generate variable output voltage using this IC with more than 1 amphere output current. 

In here we will show you one of the circuit schematic of Variable Power Supply from 1.2V to 30V at 1 Amphere using LM317 look like shown in Figure 1 below. There are many component needed but the main component in here is LM317 IC.

Circuit Schematic

Figure 1. Circuit schematic of Variable Power Supply from 1.2V to 30V at 1 Amphere using LM317 (Source: Electronicshub.org)

Component Parts

  • Transformer 2A
  • Bridge diode
  • Resistors
  • Diode
  • LM317 IC
  • Capacitors
  • Variable resistor

Description

Accordingly Electronicshub site that published this circuit describe that a transformer is used to step down the AC supply to 24V at 2A. A bridge rectifier is used to convert this voltage to DC.

This pulsating DC is filtered using the capacitor to get a clean DC and is given to LM317 which is a variable voltage regulator IC.

In order to vary the output voltage, two variable resistors of values 1KΩ and 10KΩ are used. 10KΩ POT is used for large change in voltage while 1KΩ POT is used for fine adjustments.

Depending on the settings of the POT, the ADJ pin of LM317 receives a small portion of the output voltage as feedback and the output voltage is varied.

A capacitor is used at the output of the voltage regulator so that the output voltage doesn’t have any spikes.


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