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DISCLAIMER: Vacuum tube circuits work with dangerously high voltages. Do not attempt to build circuits presented on this site if you do not have the required experience and skills to work with such voltages. I assume no responsibility whatsoever for any damage caused by the usage of my circuits.

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Tuesday, March 18, 2014

Field Coil Power Supplies

Hi!

Two field coil power supplies just finished:




Both contain two independent supplies for left and right speakers. One will power Kilimanjaro woofers:




And the other will be used for GIP laboratory midrange horn drivers:




The power supplies are passively filtered using Lundahl LL2733 filament chokes. I used my filament transformers to supply the AC. Rectification is done with Schottky diodes.




Some means of adjustment is provided by a set of switches:




The two switches on the right allow aadding or subtracting about 10% by selection of different transformer taps. In addition +/- 5% fine adjustment can be done with the left switches which select different primary taps of the transformers.

Digital LCD displays show voltages and currents for left and right:





Best regards

Thomas



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