Jeff Rowland Design Group offer battery powered amplification since early 90'sWhen things were linear and Class-A/B then this could have helped reduce noise ect, but with their new class-D stuff today, batteries can't solve the biggest problem they have, which is the Class-D switching noise filtering. Cheers George |
I used a capacitance multiplier circuit on a preamp once, worked very well, bit hard to do on a poweramp though. http://electronics-diy.com/electronic_schematic.php?id=486 Cheers George |
Wow it’s been a while, since looking at them. And you can get 48v 83 farad for a "cheap" $1,300 each you’ll need two. Great ESR as well,can you imagine the inrush current!!!!!!! No BS boutique ac voodoo fuses here, you'll need massive circuit breakers http://www.mouser.com/ProductDetail/Maxwell-Technologies/BMOD0083-P048-B01/?qs=sGAEpiMZZMuDCPMZUZ%252bYl9uUUNJQGTDeS0ZKH5mj4e4%3d Wonder who’s going to be the first linear amp manufacturer to start using them, my bets on Dan D’Agostino . Cheers George |
defiantboomerang Easy to do for preamps, phono stages, ect using single rail power supplies. But to do for poweramps with positive CT negative rails is harder, back in the 80/90’s (as you can tell by the ad) Nelson Pass was said to be the designer of one for a company called N.E.W. A20.1 http://www.canuckaudiomart.com/details/649334581-new-p3-new-201/images/1459271/ Two Nelson Pass designed tow box models for memory N.E.W. DCA-66 and DCA-33 had a bank of those black rechargeable brick shaped alarm system type batteries arranged in series/parallel to give +24v 0 -24v this way you get a 0 centre tap to ground. https://tangentsoft.net/elec/bitmaps/vgrounds/ctap-battery1.png When working properly it did sound very good to me. The only problem I believe with it was if there was more current draw on one side more than the other or the battery lost more charge on one side than the other, the battery rails became unbalanced with age, which then results in higher distortion and can lead to dc offset problems. Cheers George |
