DISCLAIMER

All rights of photos and text reserved. Usage of photos or text from my blog on other websites or for any other purpose only with prior permission. If you want to use any material from my blog please contact me by email.

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



No comments:

Post a Comment