Amazing line regulation thanks to extreme isolation

With only two internal connections to the raw DC input, Superpower has superb line regulation almost by definition. The novel output pre-driver allows fast, accurate control of the output voltage based only on the internal reference voltage and not on unwanted input signal changes. It also works over a broad frequency band, not just the audio bandwidth.

The graphs below illustrate line regulation as the rejection of 60 and 120 Hz line noise from a raw voltage supply, also rejection of other frequencies. You may have to order one to convince yourself it really is this good.

No-load spectrum—input (red), output (blue)

Line Regulation - low frequency rejection

This spectrum illustrates the line rejection of 60Hz and its harmonics at 180Hz, 300Hz, 360Hz, etc. The input is from an internally regulated 13.8V power supply (Tripp Lite PR-10) rated at 7.5A continuous, 10A pulsed. You can see the fundamental at 60Hz and the next two odd harmonic components are about 80-85dB down from 5.657Vp-p (2Vrms), giving approximately 0.5mV of AC per harmonic. The Superpower output is consistently below -120dB and largely below -126dB out to 40KHz.

This is under no load, except the Superpower itself. A better test comes when we pull significant current from the power supply. As you know, rectifier voltage ripple increases in direct proportion to delivered DC current.

Spectrum with 300mA DC load, no pre-regulator, input (red), output (blue)

Line regulation, 300mA load

To show the true abilities of the Superpower, the Tripp Lite cover was removed and the supply voltage was taken directly from the rectified voltage, before its internal regulator.
The (red) input signal from the filtered unregulated rectifier shows the spectrum of a 120Hz sawtooth wave, typical for a rectifier delivering current. Notice that the regulated output supplying 300mA is virtually unchanged from the unloaded (<10mA) output, with harmonics and noise well below -120dB, roughly 6µV. That's a 100dB improvement!
Note—due to sampling discontinuity, the red input spectrum has numerically generated high frequency content that folds into the passband and gives it a slope. The fundamental at 120Hz and its harmonic peaks above the sloped portion are the signal components of interest.

Spectrum, Input 12.5Vdc+1Vpp ripple (red),
Output 10Vdc out, 300mA DC load (blue)

Line regulation, 10VDC, 1Vpp ripple

Above is a spectrum from a fully controlled test, using a regulated 12.5V input source with 1Vpp ripple added at 160Hz. The 10V output signal is at or below -120dB from DC to 20KHz, notice the small spike at 160Hz. Performance was also measured at 60Hz and 333Hz and is just as good. The Superpower regulator is almost as good as the measurement device. This is with a 300mA load and compares favorably with line regulation of a Jung Super Regulator as seen here.

Oscillogram, Input=12.5Vdc+1Vpp ripple (bottom),
Output=10Vdc, 300mA load (top)

Oscillogram, 10Vdc out, 1Vpp input ripple

Here you see the time domain input (bottom) and output (top) of the 12.5Vdc+1Vpp input test. Test frequency is 55Hz, to differentiate from 50 or 60Hz power line frequencies. Both signals are AC coupled to the oscilloscope, which is band limited to 20MHz. The input scale is 1V per division, which was verified with a DVM to be 0.353Vrms, or 1Vpp. The output scale is 2mV per division and is essentially flat at this scale, showing total 20MHz wideband noise. Horizontal scale shows 55Hz.

The king is dead,
long live the King!

SPX has replaced SPZ

  • Variable output 5V to 30V
  • World's lowest output impedance
  • Better ripple rejection (135dBV@60Hz!)
  • Faster step response
  • Same low noise
  • Same TO-220 size physical form factor
  • No thermal pad needed
Order now from our store.

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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