[sdiy] Prophet 5 supply voltages problem

[ASSI]

On Mittwoch 31 Oktober 2007, Gil W. wrote:
> The only problem is that I get 36v on the 22 rails. I
> used a 230v, 3.2A , 2x18 center tap transformer, as on
> the schematics (there it says 2x115v, 2.8A, 30VCT).

On the scan I have it's quite hard to read, but it appears to say 36VCT, 
which is a better fit to your 2x18V anyway.

> Am I using the wrong type of transformer ?

Probably not, although you are using a higher rated version.  A current 
rating of 3.2A instead of 2.8A may cause it to have less voltage sag 
under load - I'd check if the heat sinking is still sufficient under 
full load.  The 22V rail is unregulated and you are not loading any of 
the rails yet, right?  Anyway, I think that the only place that is 
using the "+V (22V)" is the power detection circuit, everything else is 
using the regulated voltages as far as I can make out.


Achim.
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