5-35VDC or 5-22VAC to 1-34VDC LM317T Adjustable Step Down Linear Regulator Module

📋 Overview

The LM317T adjustable voltage regulator module converts DC input from 5V to 35V, or AC input from 5V to 22V, into a clean, regulated DC output continuously adjustable from approximately 1V to 34V using the onboard multi-turn potentiometer. An integrated rectifier bridge allows both AC and DC input sources, and a large 1000µF filter capacitor reduces ripple, noise, and interference from common switching power supplies.

This module is ideal for repurposing surplus computer power supplies, wall adapters, and laptop chargers as a clean, adjustable DC power source for electronics, radios, and other equipment. For example, a 19V laptop power supply can provide a regulated, adjustable output from a few volts up to approximately 16V.

🚀 Getting Started

1. Connect your DC or AC power source to the input screw terminals (observe polarity for DC input).
2. Connect your load or device to the output screw terminals.
3. Apply power — the onboard LED will illuminate to confirm input voltage is present.
4. Adjust the multi-turn potentiometer to set your desired output voltage. Use a multimeter on the output terminals to verify the voltage before connecting sensitive equipment.

⭐ Key Features

• Wide Input Range: Accepts 5V–35V DC or 5V–22V AC input, compatible with a wide variety of power sources
• Adjustable Output: Continuously variable output from approximately 1V to 34V DC via onboard multi-turn potentiometer
• AC and DC Input: Built-in rectifier bridge allows direct connection of AC power sources without an external rectifier
• Low-Noise Output: Large 1000µF input filter capacitor reduces ripple, hash noise, and interference from switching power supplies
• Power Indicator: PCB-mounted LED illuminates when input voltage is applied
• Easy Connections: Screw terminal connectors for both input and output — no soldering required
• Compact Design: Small form factor with integrated heatsink for thermal management

📊 Specifications

⚠️ Important Notes

• This is a step-down linear regulator — the input voltage must be at least approximately 2.5V greater than the desired output voltage.
• When the difference between input and output voltage exceeds 10V, keep output current below 400mA to prevent overheating.
• At higher ambient temperatures or higher output currents, active cooling such as forced airflow may be required.
• Always verify the output voltage with a multimeter before connecting sensitive equipment.
• Do not exceed the maximum input voltage ratings: 35V DC or 22V AC.

📦 What's in the Box

• 1x LM317T AC/DC to DC Adjustable Linear Voltage Regulator Module

📄 Documentation & Resources

• LM317T User & Hookup Guide
• All Linear Regulator Module User Guides

Sold and supported by Envistia Mall. Ships from the USA. For wiring diagrams, setup instructions, and troubleshooting, see the User Guide. The manufacturer and Envistia LLC (dba Envistia Mall) are not responsible for any damages or losses resulting from the use of this product. Always follow proper electrical safety practices when working with electronic components. Specifications are based on manufacturer data and are subject to change without notice.