[sdiy] Siel OR400 Transformer needed

[ASSI]

On Friday 26 July 2013, 12:54:15, M Maeghan Skala wrote:
> 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:
> 
> IC1:		-10.3
> IC2:		9.5

This is too far off from what you'd reasonably expect from a 12V output, 
especially when no load is present.  What is the voltage after the 
rectifier, across the load caps?

> IC3:		-6
> IC4:		5.9

That on the other hand might be good enough.

> 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.

If it sparked over onto the power supply only, then the most likely 
culprits, given your readings, would be the rectifier bridge and the load 
caps.  These caps are somewhat under-dimensioned anyway, so replace them 
with ones rated 100µF/35V (or even 50V if they fit physically) once you are 
sure the rectifier works correctly.  Then check the output voltages after 
the regulators again, first without load and then check that things are 
stable under load.


Regards,
Achim.
-- 
+<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+

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