Re: Vortex power supply - AC, but can take DC?

[van Sinn <vansinn@post.cybercity.dk>]

Goddard, Duncan wrote:
> why not just modify one of y'r DC supplies? take out the bridge 
> rectifier & smoothing capacitor & run the AC straight to the vortex.
>  
> the jamman is slightly fussy about the voltage it gets, & if one extends 
> the power cable on the low voltage side, or runs the psu off of slightly 
> low mains supply, the jamman will keep resetting itself.
>  
> my understanding is that the vortex has slightly less inside it, & uses 
> slightly less current.


Just an ordinary 4-diode rectifier bridge, caps, three voltage 
regulators and a few more diodes.  Geez! I checked this when I got my 
Vortex with a US adapter, and forgot I'm using a 9 volt DC stabilized 
PSU (my own build, shame on me not even remembering). Just checked.
Feeding DC into a rectifier bridge is just fine; the bridge will simply 
be superflous, allowing DC to flow through - which is what diodes are 
there for anyways :)


> ------------------------------------------------------------------------
> From: Ryan Reid [mailto:ryanreidfl@gmail.com]
> Sent: Friday, December 21, 2007 2:53 AM
> To: Loopers-Delight@loopers-delight.com
> Subject: Vortex power supply - AC, but can take DC?
> 
> Hello,
> 
> It feels a bit tacky to make my first post to the list a query. But I'm 
> in a bit of a bind.
> 
> I purchased a Vortex, of course, without an adapter. Impulsively, I 
> plugged in a supply I have that's 12.5VAC 2500mA - I know, stupid. But 
> with eBay and UPS and all, there was kind of a pressure to make sure it 
> worked. In fact, it did, and I ran it for about 10 minutes. I decided to 
> stop there though, as the over-voltage might cause problems in the 
> longer term.
> 
> I have already spent $100 on power supplies in the last couple of 
> months, and so I'm trying to be as thrifty as possible. Honestly, I 
> didn't research the Vortex PS requirement until it arrived. The best 
> deals I've found for a pro-audio 9VAC 1000mA supply are around $20-25. 
> In searching the archives, I found someone stated that the Vortex alone 
> can run on DC, while its "adapter-mates" like the Jamman cannot. Can 
> anyone confirm or contradict this? If it's true, I assume it would need 
> a few more volts. I have tons of extra DC supplies, and can easily build 
> a highly-filtered one, but transformers in this range are a bit pricey 
> themselves.
> 
> Thank you, and I'll be sure to be more of a contributor than an 
> info-leech in the future.
> 
> -R


-- 
rgds,
van Sinn