SPX Noise compared to new generation regulators

How does SPX noise compare with other voltage regulators? See the noise spectra below and judge for yourself. All devices were tested with the same input supply, gain of 1000  measurement amplifier, and spectrum analyzer. All were measured as the AC component of 12VDC output, with no load. The vertical scale of all spectra was lowered by 60dB to adjust for the 1000x gain.

Baseline Test System Noise

Noise test baseline noise measurement

This is the noise level of the test setup with input grounded. Spectrum is captured from a Handyscope HS3 from Tiepie Engineering. How low can you go? The small spike is power line noise leaking through at 60Hz, -155dBVpk.

new SPX78

SPX78 Noise spectrum across audio bandwidthBelleson's new SPX has the same low noise as our standard SPZ (below), with about 8µVrms.


SPZ78 Noise spectrum across audio bandwidth
Our SPZ has very low noise of about 8µVrms.

Sparkos Labs

Sparkos Labs voltage regulator noise spectrum across audio bandwidthSparkos Labs SS7812 has very low noise, about 6µVrms in our test setup.


LT3045 Noise spectrum across audio bandwidthLT3045 measures just over 2µVrms.

Dexa/NewClassD LC7812 UWB Mk2

SPX78 500mA dynamic response
Surprisingly, the new Dexa LC7812 UWB Mk2 measures about 110µVrms in our test setup.


TPS7A4700 noise over audio spectrumVery low noise, measures about 3.5µVrms in our fixture.


This site is being gradually updated. If you have any problems please email super@belleson.com

The Industry Standard SPX

Order now from our store.

  • 5V to 30V output
  • World's lowest output impedance
  • Superb ripple rejection (135dBV)
  • Instant step response
  • Extreme low noise
  • TO-220 footprint
  • No thermal pad needed!

High Voltage!

Tube lovers—SPHV is BACK!

  • Variable output 5V to 450V
  • Up to 500mA output current
  • Super low 0.5V drop-out at 100mA
  • Small TO-220 footprint!
  • Low output impedance
  • Fast response
  • Low noise

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SPHP—1000 Watts for your music server!

SPHP, a 10A Superpower with adjustable output voltage from 5V to 100V

  • Same low noise
  • Same blazing step response
  • Same great ripple rejection.
Just lots more current and much higher output voltage. For sale on our order page See more information in the data sheet here.

Build a power supply

A PCB and parts list for building a compact dual positive or positive+negative power supply are on this new page.

Transformer Calculator!

Use the Belleson Transformer Calculator to calculate the minimum Vrms voltage of a transformer for your Superpower based supplies.

It's Official

We're proud to announce the U.S. Patent and Trademark Office has granted patent 8,294,440 to the Superpower design.

Use the Superpower regulator in...

  • Headphone amps
  • DACs
  • Buffers
  • Clocks and reclockers
  • Preamps
  • Microphone preamps
  • Phono stages
  • Phono motors
  • Tube preamps and input stages
  • Line powered guitar effects boxes
  • Anywhere an extremely clean, quiet, dynamic power source is needed