# AAL - Symmetrical linear power supply

Low-noise symmetrical linear PSU PCB for DIY audio, DAC and analog projects.

- **Seller:** [Analog Audio Lab's store](https://lectronz.com/stores/aalab), LES MONTS D AUNAY, Calvados, France
- **Price:** €70.00 (EUR, before shipping and taxes)
- **Availability:** In stock
- **Categories:** Equipment, Power
- **Country of origin:** France
- **Product page:** https://lectronz.com/products/aal-symmetrical-linear-power-supply

## Options

**Fully or Partially Assembled**

- Fully Assembled (4 left)
- Partially Assembled (2 left)

**Voltage output**

- ±12V (1 left)
- ±15V (5 left)
- ±18V (0 left)
- ±9V (0 left)
- Custom voltage [Add €2.00] (0 left)

## Images

![AAL - Symmetrical linear power supply](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NzEwNDIsInB1ciI6ImJsb2JfaWQifX0=--0c0ab14644b575b71c858103c8cd5b041c92a103/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGVnIiwicmVzaXplX3RvX2xpbWl0IjpbOTYwLDY0MF0sInNhdmVyIjp7InN0cmlwIjp0cnVlfX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--4e27bac8cdfb621fb828f6a3a5982fe1a423b516/Alim%20Sym%C3%A9trique%20-%20Top%20View%202.jpeg)
![AAL - Symmetrical linear power supply](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NzEwMzAsInB1ciI6ImJsb2JfaWQifX0=--a692c9bb843a0e48d743ff8ae9b4fce5c9ecbcdb/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGVnIiwicmVzaXplX3RvX2xpbWl0IjpbOTYwLDY0MF0sInNhdmVyIjp7InN0cmlwIjp0cnVlfX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--4e27bac8cdfb621fb828f6a3a5982fe1a423b516/Alim%20Sym%C3%A9trique%20-%20Left%20Side%20View.jpeg)
![AAL - Symmetrical linear power supply](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NzEwMzQsInB1ciI6ImJsb2JfaWQifX0=--9abd16f3a6c06b45c00d32c1ee4e68acf0d6c146/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGVnIiwicmVzaXplX3RvX2xpbWl0IjpbOTYwLDY0MF0sInNhdmVyIjp7InN0cmlwIjp0cnVlfX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--4e27bac8cdfb621fb828f6a3a5982fe1a423b516/Alim%20Sym%C3%A9trique%20-%20Top%20View.jpeg)
![AAL - Symmetrical linear power supply](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NzEwMzgsInB1ciI6ImJsb2JfaWQifX0=--0b93b2c723da5e9c3e4207bd387a98bf24b81e83/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGVnIiwicmVzaXplX3RvX2xpbWl0IjpbOTYwLDY0MF0sInNhdmVyIjp7InN0cmlwIjp0cnVlfX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--4e27bac8cdfb621fb828f6a3a5982fe1a423b516/Alim%20Sym%C3%A9trique%20-%20STAR_0V.jpeg)
![AAL - Symmetrical linear power supply](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NzEwNDYsInB1ciI6ImJsb2JfaWQifX0=--0c65b1f675d831c9edbb73d46b7abb7e66db49d8/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGVnIiwicmVzaXplX3RvX2xpbWl0IjpbOTYwLDY0MF0sInNhdmVyIjp7InN0cmlwIjp0cnVlfX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--4e27bac8cdfb621fb828f6a3a5982fe1a423b516/Alim%20Sym%C3%A9trique%20-%20Tab%20View.jpeg)
![AAL - Symmetrical linear power supply](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NzEwNTAsInB1ciI6ImJsb2JfaWQifX0=--e304dd61a45372f3c356645ba2ce1f47494fab46/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGVnIiwicmVzaXplX3RvX2xpbWl0IjpbOTYwLDY0MF0sInNhdmVyIjp7InN0cmlwIjp0cnVlfX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--4e27bac8cdfb621fb828f6a3a5982fe1a423b516/Alim%20Sym%C3%A9trique%20-%20Kit%20Thermique.jpeg)
![AAL - Symmetrical linear power supply](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NzEwNTQsInB1ciI6ImJsb2JfaWQifX0=--32c9eea0a09ac4777bd4a08dc930b8bfc3b3662c/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGVnIiwicmVzaXplX3RvX2xpbWl0IjpbOTYwLDY0MF0sInNhdmVyIjp7InN0cmlwIjp0cnVlfX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--4e27bac8cdfb621fb828f6a3a5982fe1a423b516/Alim%20Sym%C3%A9trique%20-%20Female%20connectors.jpeg)
![AAL - Symmetrical linear power supply](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NzEwNTgsInB1ciI6ImJsb2JfaWQifX0=--b030230ead817c571259eac2881707b9356dd54e/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGVnIiwicmVzaXplX3RvX2xpbWl0IjpbOTYwLDY0MF0sInNhdmVyIjp7InN0cmlwIjp0cnVlfX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--4e27bac8cdfb621fb828f6a3a5982fe1a423b516/Alim%20Sym%C3%A9trique%20-%20Empty%20LM317.jpeg)
![AAL - Symmetrical linear power supply](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NzEwNjIsInB1ciI6ImJsb2JfaWQifX0=--cff06d3382663e0884a0987066d6723236616a04/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGVnIiwicmVzaXplX3RvX2xpbWl0IjpbOTYwLDY0MF0sInNhdmVyIjp7InN0cmlwIjp0cnVlfX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--4e27bac8cdfb621fb828f6a3a5982fe1a423b516/Alim%20Sym%C3%A9trique%20-%20Empty%20LM337.jpeg)
![AAL - Symmetrical linear power supply](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NzEwNjYsInB1ciI6ImJsb2JfaWQifX0=--174c5b14790ebd46bdb83d970230f934b0e26388/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGVnIiwicmVzaXplX3RvX2xpbWl0IjpbOTYwLDY0MF0sInNhdmVyIjp7InN0cmlwIjp0cnVlfX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--4e27bac8cdfb621fb828f6a3a5982fe1a423b516/Alim%20Sym%C3%A9trique%20-%20Empty%20resistors.jpeg)

## Description

##What is it?

The **AAL – Symmetrical Linear Power Supply** is a low-noise linear PSU PCB based on the LM317 / LM337 and designed with particular attention to signal integrity, robustness and proven analog design practices.

Designed for audio and sensitive analog projects requiring a cleaner, quieter and more reliable supply than generic switching modules.

**Included**

- Fully or partially assembled PCB (depending on selected version)
- Female PCB connectors for input and output connections

**Transformer not included**

**Features**

- Symmetrical AC input (dual secondary transformer)
- Supported AC input range: 2×9V to 2×18V AC
- Typical regulated output voltages: ±9V / ±12V / ±15V / ±18V
- Adjustable depending on regulator resistor configuration

**Maximum output current**

Maximum current depends on:

- Transformer used
- Thermal dissipation and heatsinking of regulators

**Example:** up to approximately **1.34A continuous output current** with appropriate cooling.

##Why did you make it?

Many DIY audio and analog projects deserve something better than noisy generic PSU modules.

The **AAL – Symmetrical Linear Power Supply** is an ideal companion for DIY preamps, headphone amplifiers and demanding analog audio projects.

This board was designed to provide a robust, low-noise and audio-friendly linear power supply suitable for demanding analog circuits.

**Typical Applications**

- Audio preamps
- Headphone amplifiers
- DAC analog stages
- Analog signal processing
- Sensitive analog electronics projects

##What makes it special?

- Low-noise linear topology (LM317 / LM337)
- Regulated symmetrical outputs
- Centralized **star-ground (0V) layout** to reduce ground loop issues
- HF noise suppression network on the 0V reference
- Oversized rectification and filtering for better load stability
- Carefully selected and positioned decoupling capacitors for regulator stability
- Fast protection diodes around regulators
- PCB routing optimized for analog performance

**Notes:**

**Skill level:** Beginner to experienced DIYers

**Assembly notes**

Basic through-hole soldering skills are recommended.

If you choose the DIY version and are unsure about the final voltage configuration, the regulator-setting resistors can be left unassembled and supplied separately for flexibility.

Basic understanding of linear power supplies is recommended.

##Why this price?

Built using carefully selected high-quality components (Wima, Vishay, Panasonic, KEMET, STMicroelectronics, etc.) chosen for performance, reliability and long-term durability.

All parts are sourced from reputable suppliers to ensure quality and traceability.

##Who did it?

Designed, hand-assembled and individually tested in France by **AAL — Analog Audio Lab**.

*Practical electronics designed to solve real-world problems.*

[analog.audio.lab@gmail.com](mailto:analog.audio.lab@gmail.com)