Shunt voltage regulator

At a glance


  • high-end shunt regulator for audio devices created by the journal “Klang + Ton”
  • capable for up to 400 mA
  • based on the precision voltage source LM431
  • PCB available in our shop

This PCB has been designed after a circuit published in the German DIY magazine “Klang + Ton”. The quiescent current is provided by a LM317 as a constant current source. A resistor defined the current. This circuit can be used from about 50-300 mA. It is recommended to use at least twice of the current that is required by the powered circuit.


There is an old version of the circuit available on This old version consists of a single regulator. Also external cabling is needed to use it as a positive or negative regulator. With the new version, you do can simple use is as a “normal” regulator with an input and an output.

The voltage difference between input and output must be at least 3.5 Volts, but I recommend to have 5 Volt (or even more if you like).

The heat sinks are Fischer SK104. Depending on the current drawn and the voltage difference between input and output, you may use smaller heat sinks or larger. In our tests these SK104 worked well with 5V voltage difference from input to output and 250 mA current. Note that more current drawn by the consuming circuits means less power dissipation at the voltage regulator.

Additional information

8 thoughts on “Shunt voltage regulator

    1. matuschd Post author

      Use the regulator between GND and the negative voltage. The current limiter will be used in the negative power supply. I will post a picture later. But there is also a version for symmetrical power supply in that handles all this.

  1. Georg

    Hi Daniel,

    I’m trying to figure out the pin layout of input and output. Is it possible to post the pin layout? A typical wiring diagram (e.g. unisieb, shunt regulator, platina) should be very helpfull too :-)


  2. Mr.Mac

    I would like to order your High End Power Supply Kit, the “symmetrical version”,
    any chance?

  3. Markus B

    Hello there, can you say me how to set the jumpers? That is the quiescent current i know, but how is how and what does what in the audio result?
    is it possible to post an schematic of the finally version here? i did not found in the whole internet on any ressources you had linked.


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