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