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Low-noise symmetrical linear PSU PCB for DIY audio, DAC and analog projects.
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.
Links to code and documentation
No additional links provided for this product.
Shipping policy
No information available.
AAL - Symmetrical linear power supply
Sold by Analog Audio Lab's store
$79.09
No tax for United States [change]
Stock available: 4
The seller
Electronics enthusiast since childhood, musician, and longtime engineer, I design and build electronic devices combining analog audio, embedded systems, and practical everyday innovation.
My background includes:
IT systems & network engineering
analog audio electronics
microcontroller and robotics projects
studio recording and live sound for more than 10 years
Today, through AAL (Analog Audio Lab), I develop DIY and boutique electronic solutions ranging from audio devices and signal conditioning tools to smart everyday electronics designed for reliability, simplicity, and real-world usefulness.
My background includes:
IT systems & network engineering
analog audio electronics
microcontroller and robotics projects
studio recording and live sound for more than 10 years
Today, through AAL (Analog Audio Lab), I develop DIY and boutique electronic solutions ranging from audio devices and signal conditioning tools to smart everyday electronics designed for reliability, simplicity, and real-world usefulness.