A Superpower Supply

Many of you have built your own power supplies. Here is a buy and assemble kit, given as a PCB file, a parts list and a schematic, to serve as a starting point or final hardware for either a dual positive supply or a positive and negative supply. It's configured with the regulators at the card edge to allow them to be easily attached to heat sink(s).

Positive+Negative Superpower Supply assembly photo.

The PCB, supplied as an ExpressPCB file, can fit either a Triad or Amveco toroid. The regulator connections are for LM78xx and LM79xx for positive and negative output, so you can use this with two SPX78s or one SPX78 and one SPX79. Or you can go cheap and use standard monolithic devices. Either transformer can be wired with secondaries in series to increase (double) Vrms, note that this limits the circuit to a single output.

The two circuits have isolated ground reference connections that can be tied together at the load to prevent ground current cross–talk between the two power supplies.

Positive+Negative Superpower Supply Schematic

Positive+Negative Superpower Supply schematic.

Dual Positive Superpower Supply Schematic

Dual Positive Superpower Supply schematic.

Positive + Negative PCB

Positive+Negative Superpower Supply PCB.

Dual Positive or Positive/Negative Supply

We offer two different PCBs, one with dual positive supplies and one with positive and negative supplies. Both use dual primary/dual secondary toroidal transformers. The dual primary allows 120V input (inputs in parallel) or 240V input (inputs in series). The PCBs are 2.5x3.8 inches each.

Dual secondaries can be connected in series for higher voltage or in parallel for higher current. If the secondaries are placed in series, only a single supply can be built. Two transformers are in the parts list, the Triad can be used for dual outputs at 2A each, with regulated Vout between 3.3V and 7V (positive or negative depending on your selection). At 3.3V out, the regulator(s) will dissipate 10W at 2A and thus the need for the heat sink you see in the photo.

Parts List

All parts except PCB, heat sink and Amveco transformer are available at http://www.mouser.com/, Amveco transformer available at http://www.digikey.com/, PCB and heat sink available from the links given.

Qty Ref. Des. Value
Description Part Number
1 Positive+ Negative PCB from OSH Park see text Download Gerber/Excellon files (zipped) to order positive+negative PCB After you download the zipped file, go to http://www.oshpark.com/ and submit it, you get 3 boards for about $48(US).
1 Dual Positive PCB from OSH Park see text Download Gerber/Excellon files (zipped) to order dual positive PCB After you download the zipped file, go to http://www.oshpark.com/ and submit it, you get 3 boards for about $48(US).
1 Positive+ Negative PCB see text Download ExpressPCB file to order positive+negative PCB Download PCB software from ExpressPCB and order, you get 3 boards for about $90(US).
1 Dual Positive PCB see text Download ExpressPCB file to order dual positive PCB The 3 boards must be the same, so you can't order dual positive and positive/negative together.
1 SPX78 * Superpower voltage SPX78, specify voltage [note that standard LM78xx can be used]
1 SPX79 * Superpower voltage regulator SPX79, specify voltage [note that standard LM79xx can be used]
2 DB1,DB2 600VA 4A
Genesic SiC bridge rectifier KBL406G
2 C1, C2 0.01?F
Kemet Film Capacitor 63volts 0.01uF 10% LS=5mm SMR5103K63J01L4BULK
2 C3, C4 10000?F
Nichicon Audio Grade UKA1C103MHD
1** Transformer Regulator Vout = dual 6V to 15V
or bipolar up to +/-15V
max 1A per supply Triad VPT24-1040
1** Transformer Regulator Vout = dual 3.3V to 5V
or bipolar +/-5V
max 2A per supply Triad VPT12-2080
1** Transformer Regulator Vout = dual 6V to 15V
or bipolar up to +/-15V
max 400mA per supply Amveco 70042K
Connector Plug

Omron I/O Connectors 4P CABLE PLUG CONN 28-20 AWG XN2A-1470
Connector Socket

Omron I/O Connectors 4P CABLE PLUG CONN 28-20 AWG XN2D-1471
R1‡, R2‡
Static Load Resistor
Static load to improve transient performance
Select a value Vout/0.015 to draw 15mA from the regulator
C5‡, C6‡ 100µF Nichicon 50V capacitor, add this capacitor to the load circuit PCB UVR1H101MPD
1 Heat sink 2.5"/ 63mm, height 0.8"/ 20mm, depth 1.5"/ 37mm

Sunetec SS314 Aluminum Black Heat Sink

SS314 (from Hong Kong via eBay)
1 Positive+Negative Schematic Download positive+negative supply schematic) DipTrace Schematic for Positive+Negative Superpower supply
1 Dual Positive Schematic Download Dual positive supply schematic) DipTrace Schematic for Dual Positive Superpower supply

*For dual positive supply, get two SPX78 positive Superpower regulators with Vout as needed.
For positive/negative supply, get one SPX78 and one SPX79.

** Order the transformer that meets your Vout and power (VA) needs. Select transformer voltage rating (either in series or parallel) above and close to [(Vout + 1) /√2 ]. Use our Transformer Calculator page to determine your transformer VA and voltage needs.
Choose a transformer that fits on the PCB! For a given size, the Triad has more VA capability.

‡ These components are not on the Superpower Supply, they are mounted on the load circuit (your DAC or preamp or mixer or whatever).


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

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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