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

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

andy butler wrote:
> Ryan Reid wrote:
>> 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.
> 
> 
> It's possible, in the same way that it's possible that the 12.5V supply 
> might not cause problems. It's even possible that the Vortex circuitry 
> in a bit different
> in the power circuitry, the Jamman/Alex/Reflex are all basically the 
> same circuitry overall,
> but the Vortex is different.
> 
> Personally, though, I wouldn't risk it.

Always a good starting point, until checking schematics..

The Vortex PSU is pretty simple, just some rectifying diodes, capacotors 
and 78xx and LM2930 voltage regulators.
With a 12 volt adapter, you'll burn a little more heat, due to dropping 
more voltage across the regulators.
All capacitors are overrated 50 volt (in the schematics, haven't checked 
on the board, but won't expect crappy low-voltage ones).
In the long run, use a 9 volt adapter. Until then, niçio problema.

-- 
rgds,
van Sinn