I am looking for a power supply for the Pass B1 buffer preamp. The requirements, quoting Nelson Pass:

"The buffer uses an external power supply from 18 to 24 Volts DC. You can power it with batteries, but most convenient is an external regulated supply running off the wall. The preamp typically draws fewer that 0.02 Amps, so current is not much of an issue. A regulated supply is better, but the circuit is pretty good at ignoring noise on the supply and minor fluctuations."

My reading suggests that most people prefer Vout ~ 24vdc, and the excellence of the Placid and its ability to adjust Vout are attractive. Thus, do you think the Placid HD 2.1 is a good choice for my application?

Many thanks,
Pete

BTW, I recently inquired about the availability of the LCBPS which would power the Analog Signal Processor (ASP) of my Linkwitz Orions (i.e., I'm looking for two power supplies for different applications; I'm not confused).

Edited by user Wednesday, October 1, 2014 3:51:24 PM(UTC)  | Reason: remove discussion trouble with the Vout calcuation in the manual, not really relevant.

Thanks, very helpful. Unless someone here sees a problem, I will go ahead and order in the next day or two. / Pete

Thanks!! I'm very interested, but not in a big rush either. Let me know what you think once you have had time to try it. / Pete

I was able to test this, but only for a short time. Everything seems to work just fine. I was using a 15v+15v trafo in series, so ~30V input. This brought the rectified voltage up way to high for the standard smoothing cap (35V), but I was able to adjust the output voltages to 25VDC and adjust a range of shunt currents.

I would probably up the smoothing cap to 50V in your situation, just to make sure there is plenty of room, but I think it will work fine.

I could swap a 50V/15kuF cap in to the kit in place of the standard 35V/10kuF if you want.

Just placed my order! Thanks..