[sdiy] Transformer question

[Jerry Gray-Eskue]

Here is an old trick I have seen on production lines more than once. You can parallel two matched power transformers to get very near to twice the power out. You must make sure they are in phase with each other or you will smoke both of them. If hard wiring them in parallel makes you uncomfortable you can also run them into rectifiers and parallel the output of those as your raw voltage supply.



-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Mykolas
Sent: Thursday, February 24, 2011 4:15 AM
To: synth-diy
Subject: [sdiy] Transformer question

Hi guys,

I'm about to build ±15V psu using LM317/LM337, but there is question
about transformer. In my local shops I can get 2x15V 1A rated
transformer, but not bigger :( there is option 2x18V 2x1.1A (but it
has couple more secondaries), link:
http://www.evita.lt/en/det-1562-transformer-tp60-9-2x18v-2x1.1a-10.6v-0.6a-5v-0.5a.html

Can I use 2x15V 1A transformer or do go with 2x18V and leave secondaries free.

Many thanks.

-- 

Mykolas
+370 67626261
www.analogas.uzrasai.lt
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