LM317 LM337 Adjustable Dual DC Linear Power Supply Module
LM317 LM337 Adjustable Dual DC Linear Power Supply Module
LM317 & LM337 Dual Positive/Negative Adjustable Linear DC Power Supply Module
Take full control of your electronics projects with this versatile LM317 & LM337 dual-rail linear power supply module. Designed for engineers, hobbyists, and electronics enthusiasts, this compact buck step-down board delivers both positive and negative adjustable output voltages — making it ideal for op-amp circuits, audio amplifiers, sensor platforms, and custom embedded systems that require a symmetric dual-rail supply.
The module pairs the classic LM317 positive voltage regulator with the LM337 negative voltage regulator, allowing you to independently tune each rail with precision. Its linear regulation design ensures a clean, low-noise output — essential for sensitive analog and audio applications.
Key Specifications
- Module Models: LM317 (positive) & LM337 (negative)
- Module Type: Linear Power Supply
- Input Voltage: ±3V to ±40V
- Output Voltage: ±1.25V to ±37V (adjustable)
- Output Current: 1A (MAX)
- EU LVD Compliance: Low voltage — below 50V AC or 75V DC
Why Choose This Power Module?
- ✅ Dual-rail output — simultaneous positive and negative adjustable rails for symmetric power supply needs
- ✅ Wide input range — accepts ±3V to ±40V input for flexible bench and in-circuit use
- ✅ Low-noise linear regulation — ideal for audio, RF, and precision analog circuits
- ✅ Compact board design — easy to integrate into enclosures or prototype builds
- ✅ Industry-standard ICs — built on the proven LM317/LM337 chipset, widely documented and supported
Typical Applications
- Operational amplifier (op-amp) dual-supply circuits
- Audio preamplifier and amplifier boards
- Bench power supply builds and DIY lab equipment
- Sensor and instrumentation circuits
- Microcontroller and Arduino accessory power rails
Package Includes
- 1× LM317 LM337 Power Supply Module
Note: Due to lighting conditions and display screen variations, the actual product color may differ slightly from images shown. Please allow a measurement tolerance of 1mm–1cm due to manual measurement.
Made in Mainland China.
For more information on electrical safety standards for low-voltage electronics, visit the U.S. Consumer Product Safety Commission (CPSC). For safe electronics handling and workplace standards, refer to OSHA's Electrical Safety guidelines.
Frequently Asked Questions
Q: What is the difference between the LM317 and LM337 on this power supply module?
A: The LM317 is a positive adjustable voltage regulator that controls the positive rail of the power supply, while the LM337 is its negative counterpart, regulating the negative rail. Together on this board, they provide a symmetric dual-rail output (e.g., +12V and -12V simultaneously), which is commonly required in audio amplifier and op-amp circuit designs.
Q: What input voltage does this LM317 LM337 power supply module require?
A: The module accepts an input voltage range of ±3V to ±40V, making it compatible with a wide variety of AC-DC or DC-DC power sources. The output can then be adjusted between ±1.25V and ±37V depending on the resistor configuration on the board.
Q: Is this module suitable for audio amplifier projects?
A: Yes. Linear power supply modules like this LM317/LM337 board are particularly well-suited for audio applications because linear regulation produces significantly less electrical noise compared to switching (buck/boost) regulators, resulting in cleaner power delivery to sensitive audio circuits.
Q: What is the maximum output current of this adjustable power supply board?
A: The module supports a maximum output current of 1A per rail. For applications requiring higher current, an external pass transistor can be added in conjunction with the LM317/LM337 ICs, though this would require circuit modification beyond the stock board.