⚡Compact variable voltage source with LM317T integrated circuit for protoboard

In this video we will see how to assemble an adjustable power supply, with the lm317 integrated circuit, and other electronic components. This project is ideal, if you want to put together an economical source, easy to make, and perfect to insert into our protoboard. Included is the printed circuit.

The LM317t is a monolithic integrated circuit in TO-220, intended to be used as a positive adjustable voltage regulator.
It is designed to supply more than 1.5 A of charging current with an adjustable output

voltage in a range of 1.2 to 37 V. The rated output voltage is selected by a resistive divider, which makes device exceptionally easy to use.

For use it only requires two external resistors to get the output value. In fact the load and regulation line is better than in fixed regulators. In addition to the best characteristics with respect to fixed regulators, it has protection for current limitation and excess temperature, being functional overload protection, even if the control terminal is disconnected.

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Pinout

Specifications

  • : Adjustable
  • Number of outputs: 1
  • Minimum input voltage: 4.2 V
  • Maximum input voltage: 40 V
  • Minimum adjustable output voltage 1.2 V
  • Maximum adjustable output voltage: 37 V
  • Output current: 1.5 A
  • Minimum operating temperature: 0oC
  • Maximum operating temperature: 125oC
  • Encapsulated: TO-220
  • 3 pins

WHAT IS A VOLTAGE SOURCE

A voltage source is a circuit like the one that can provide constant voltage and current. For this purpose the LM317 circuit requires an input voltage source. For example, the difference between the input and output of the LM317 controller should be at least 4.2V and a maximum of 40V.

The LM317 voltage regulator has the characteristic of having a variable configuration. This adjustable source is controlled via variable resistance.

CIRCUIT LM317

The LM317 circuit has different configurations to regulate voltage. For example, the most commonly used configuration is that of variable controller from 1.2V to 37V. To achieve this adjustable power supply, it is required to connect the next circuit. This source requires a resistance of 470 Ohm and a potentiometer of 10k. Then, two of the potentiometer terminals will connect to each other (one in the center and one edge). These connections will be attached to the resistor terminal and the controller adjustment pin. Also the other terminal of the potentiometer is grounded as well as the ground of the input source. The regulated voltage output (the center pin) is connected to the 1k resistor terminal. Finally, the positive of the input source is connected to pin 3. The following figure shows the resulting circuit.

Circuit

Materials:

A heatsink
Lm317T integrated regulator
10Kohm Print Potentiometer
Male pins in total 4
0.1 uF ceramic disc capacitor
1 uF x 50 Volt electrolytic capacitor
Printed circuit
Download gerber file Gerber_lm317_fuente_regulada
LM317T data sheet

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