Ripple Rejection You May Not Believe

Our new test setup and old ripple rejection source shows that the redesigned Superpower continues to perform beyond our expectations. To see how Superpower compares to other commercially available regulators, an SPJ78, SPM78 and 5 other regulators were tested. Here is what we measured, where higher numbers represent better rejection, thus less ripple that gets to the regulator output:

Ripple rejection comparison

The test is done as described below using ±0.5V sine wave on top of 15Vdc. The new ultra–quiet design and better test equipment means low frequency PSRR is now visible above the noise floor starting at about 500Hz. It measures -90dBV at 40KHz!

Our customers' comments that their systems sound so much better with Superpower are backed up by measurements—order one to hear for yourself, it really is this good.

To see our original PSRR page with real world measurements of power supply ripple removal, go here. If you would like to see spectra of the other devices, contact us via email at email

The source fixture uses a DC+AC driver based on the LM3886 as seen in the schematic below (click for full view). The LM3886 has wide bandwidth, sufficient output power and slew rate to deliver a good sine wave on top of a DC voltage.

Ripple rejection test source schematic

We did direct comparison measurements by setting up the fixture, calibrating Vin and frequency and plugging in each of the regulators in turn. Test conditions:

  • Vin=15VDC+1VppAC
  • Vout=12V
  • Load = 240Ω
  • Output current = 50mA
Iout is low enough to be fair to the regulators that cannot deliver high currents. Vin AC was calibrated after each frequency change. LM317 and LT3080 were connected with appropriate resistors and capacitors to give 12V output and be optimally stable per their data sheets.

A 16 bit 195K sample/second autoranging A/D was used for the FFT measurements. A 4 digit true RMS DMM was used to calibrate the RMS value of Vin(ac) to 0.3535V after each frequency change. Measurements were made from 50Hz to 40KHz.

SPZ is here!

SPZ, a small 3A SPJ replacement that fits into the space for a monolithic TO-220.

  • Same low noise
  • Same blazing step response
  • Same great ripple rejection
  • More current: 3A
AND it's small enough to directly replace a LM1117 or LM7805! Order now from our store.

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. Now for sale on our order page See more information in the data sheet here.

Authorized Upgrade Centers

Always wanted to improve your system but modifying it makes you nervous? Now you can let a professional do it! Go to our Authorized Upgrade Centers page to find companies that can replace your existing regulators with Belleson Superpower.

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