The LM317 adjustable voltage regulator power supply module converts an input voltage of 4V to 35V DC into a stable, variable output of 1.25V to 27V DC with a maximum current of 1.2A. It has a built-in multi-turn potentiometer for easy voltage adjustment, which makes it ideal for powering electronic modules and testing DIY circuits.
Specification
The quick technical specification of the circuit board is given below.
| Module Type | Power Supply |
| Chip Used | LM317 |
| Input Type | DC |
| Input Voltage Range | 4V to 35V |
| Input Terminal | 1 |
| Output Type | Variable DC Voltage |
| Output Voltage Range | 1.2V to 27V |
| Output Terminal | 1 |
| Output Current | 1.2 Ampere Max. |
| PCB Colour | Blue |
Circuit Diagram
Schematic of lm317 adjustable voltage regulator power supply module circuit as shown below.
The components are used in the circuit boards are - U1: LM317 IC, C1: 100nF 0608 SMD Ceramic Capacitor, R1: 220R 1/4W Resistor, PR1: 10K Multi-turn Potentiometer, C2: 47uF 50V Electrolytic Capacitor, and H1 H2: 2-Pin Screw Terminal Connector.
Circuit Working Explanation
The working of the adjustable voltage regulator power supply module based on the 3-pin LM317 integrated circuit is simple.
When an input voltage in the range of 4V to 35V is applied to the input connector (H1) of the circuit board. Capacitor (C1) protects against noise from the input source, especially if the source is more than 6 inches away from the module.
Initially, the LM317 chip develops and maintains a nominal reference voltage of 1.25V (VREF) between its output and adjustment terminals. This reference voltage is converted into a programming current (IPROG) by the fixed resistor R1, and this constant current flows through potentiometer (PR1) to ground. By adjusting the potentiometer, a wide range of stable DC output voltages (1.2V to 27V) can be obtained, with a maximum current of 1.2A. Capacitor (C2) smooths the output voltage, which is available at the terminal (H2).
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