[sdiy] Siel OR400 Transformer needed

Dave Manley dlmanley at sonic.net
Fri Jul 26 22:40:07 CEST 2013

I want to thank the sdiy community for responding so helpfully to Maeghan's request for help.  I suggested she try here after getting a sh&t storm of useless noise on AH.  There are a great bunch of people here and the responses have been technical and to the point.

Let's hope it stays that way!  :-)


-------- Original Message --------
 From: M Maeghan Skala <synth.diy at pulsewidthmod.com>
 Sent: Fri, Jul 26, 2013 12:57 PM
 To: ASSI <Stromeko at nexgo.de>
 CC: Synth-diy at synth-diy.org
 Subject: Re: [sdiy] Siel OR400 Transformer needed

>here's the schematics for the synth https://docs.google.com/file/d/0B8AGUCtwqUz4bnNFQnNWUGVrMk0/edit?usp=sharing
>hope this helps
>On Jul 26, 2013, at 3:48 PM, ASSI <Stromeko at nexgo.de> wrote:
>> On Friday 26 July 2013, 11:16:04, Steve Lenham wrote:
>>> BTW, it is OK to use a higher VA-rated transformer if it is easier to
>>> source and will physically fit.
>> If this is intended as a replacement for something built pre 1985 or so, 
>> then I'd not make that recommendation without looking at the indivdual 
>> circuit.
>> Most often a the higher rated transformer will have less voltage drop under 
>> load (depending on the core material and winding style used this could be 
>> more than 10%).  This, in combination with the now higher line voltage (up 
>> from nominally 220V to 230V and in most places another 5V higher on average) 
>> is enough to push some aged components over the edge, especially if their 
>> rating was somewhat borderline to start with.
>> Regards,
>> Achim.
>> -- 
>> +<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+
>> Factory and User Sound Singles for Waldorf rackAttack:
>> http://Synth.Stromeko.net/Downloads.html#WaldorfSounds
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