[sdiy] Siel OR400 Transformer needed
M Maeghan Skala
synth.diy at pulsewidthmod.com
Fri Jul 26 18:54:15 CEST 2013
So I decided to test the poet supply once more so I connected everything back up and did some readings … out's for each of the IC"s are as follows:
Just to make sure I tested at the Ribbon cable out:
So the synth is giving a constant noise, it's also modulating it's pitch. When I hit the keyboard, it does nothing. I guess when the power supply short circuited … it arced over to other components. This is a really really sad day for me. I can't afford to send it off to get to get fixed. It's all over most of tracks :(
I don't know what to do.
I purchased the schematics from music parts.com … :( I don't know what the hell I'm doing.
On Jul 26, 2013, at 6:16 AM, Steve Lenham <steve at bendentech.co.uk> wrote:
> On 26/07/2013 10:39, M Maeghan Skala wrote:
>> So, I"m looking for a 30VA transformer, center tapped … which has two
>> secondaries rated at 15VAC.
>> Please correct me if I am wrong.
> That's about right.
> To be absolutely clear, a transformer will only be described as centre-tapped if it has three secondary pins (two ends and one centre tap). It may also be described as, say, 15-0-15 or 30VCT.
> Here in Europe at least, pretty much all transformers now seem to be made with two separate secondaries, i.e. four secondary pins. These are not strictly centre-tapped. They can be wired centre-tapped as I described, but can also be used in other configurations which is why the modern parts are made that way. They may be described as 2 x 0-15 or 2 x 15V.
> BTW, it is OK to use a higher VA-rated transformer if it is easier to source and will physically fit.
> Steve L.
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