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25 Volt Adjustable Voltage Regulator Circuit

admin May 7, 2010 4 Comments

Circuit Description

The circuit diagram of 25V Adjustable Regulator has been given here. This circuit is based on LM 117 IC which is the central part of this circuit. The LM117 IC is an adjustable 3-terminal positive voltage regulator. This voltage regulator is able to provide in excess of 0.5A over a 1.2V to 37V output range. The added advantages of this circuit is that the ease of handling and the use of only two external resistors for setting the output voltage.

In this circuit, voltage adjustment is done by using the resistors R1 and R2. This power supply for this circuit is able to deliver a maximum of 0.5A current. By adjusting the potentiometer R2, required voltage can be obtained. To reduce min output voltage from 1.2 volt to 0V, connect two IN4007 diodes in series to the output.

Circuit Diagram

25 Volt Adjustable Voltage Regulator Circuit

25 Volt Adjustable Voltage Regulator Circuit

LM 117 Pin Diagram

lm117 pin diagram

lm117 pin diagram

Notes

  • For getting a 1.2A output current replace LM117 with LM317.
  • This circuit is easy to assemble and provides great results.
  • Adequate heat sink should be provided for IC LM 117.
  • To get a 1.2A output current replace LM117 with a LM317.
  • You can use as less as 5V DC as input voltage. Here a minimum 28V, 2A DC input is needed for the IC as shown in figure.
  • If exact value components are not available then try the nearest ones.
Comments
  • […] 25 Volt Adjustable Voltage Regulator Circuit | Amplifiers-Electronic amplifier circuits, power ampli… […]

  • August 12, 2010

    25 Volt Adjustable Voltage Regulator Circuit…

    This circuit is based on LM 117 IC which is the central part of this circuit. The LM117 IC is an adjustable 3-terminal positive voltage regulator……………..

  • sakthi
    September 6, 2011

    Hi friends i am using gprs and rfid device. in this i have to give 12v supply to GPRS with help of regulator i have to give 5v supply to RFID.For testing i am using 12v adapter. when i am using this 12v adapter for testing regulator will convert 12v to 5v, after a few minutes its decreased 5v to 2.2v.so i can’t give 5v supply to RFID. if i am using 12v Battery supply means it’s working,is there any other idea for increase the voltage level

  • sakthi
    September 6, 2011

    I am using This LM117 IC

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