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Sunday, April 23, 2017

The 6 Channel Field Coil Supply


Some photos of a field coil power supply which has been finished recently.

It is meant to supply a pair of speakers with 3 field coil drivers per side.

All in one chassis.

Completely passive choke filtered supplies, independent for each driver.

Voltages can be adjusted in 5% steps with a common set of switches per section (bass, midrange and tweeter). Digital meters monitor voltage and current of each of the 6 independent supplies.

Adjustment is done by selection of different primary and secondary taps on the power transformers to avoid any regulation circuitry.

LCLC filtering of each of the 6 voltages, so 12 chokes in total.

The finished unit weighs over 50kg!

Best regards



  1. or hot?
    There are no Kühlschlitze on top!!!

  2. How do you like the Wima MKP6 compared to the ASC x386 ?

    1. The caps uses here are very different in capacitor values compared to the ASC i use so not really comparable in a meaningful way

  3. Hello. I'm need to thank you for such a wonderful website. What manufacturer makes the digital panel meters you are using for displaying the voltage and current? I'm constructing a power supply and would like to incorporate such meters.