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Source for reasonably priced R-core or toroidal 32v 100va transformer for maxed M3 w/ a11?

post #1 of 5
10/17/10 at 10:29pm
Thread Starter 

Like it says in the title - at long last i am really truly thinking about doing right by my trusty old M3 amp board. And using it as a low-wattage power amp.

 

It would appear from the docs at amb's site that what I'm looking for is a 32v or 2x16v 100va transformer to achieve ~3a of 36v from an a11 board.

 

Doesn't seem to be a common transformer - 30v and 36v transformers seem to be far more common.

 

The target enclosure used to be a 2U ethernet switch, so the vertical measurement of the transformer is limited to about 2 inches.. This probably means that an R-core is ideal. EI-core transformers are simply not likely to fit. A lot of the toroids I've seen are near 3 inches thick and won't fit.

 

I've come to terms with the fact that i may pay well over $60 after shipping.

 

But where do i get it?

 

Also, have people used 36v trafos to get 36v out of one of amb's power supply boards without issues?

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post #2 of 5
10/18/10 at 12:14am
Email Richard at sumR, if he can't make what you desire, he'll surely point you in the right direction.
http://www.sumr.com/
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post #3 of 5
10/18/10 at 1:30am

I would go slightly lower even, another vote for richard here, he does excellent work with toroids and should be able to sort you out. I have run the sigmas at 36v, as long as the regulation is good then 35-36vac should work well. its right on the edge of performance though and some parts need to be changed. if you want potted from him, with shipping might be a bit over your 60, though not too much.

 

note, I did not do any load testing with 35-36 input/output, but I think it should work fine. unloaded it managed it without sweating, but I did change caps to 63 and 100v


Edited by qusp - 10/18/10 at 1:33am
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post #4 of 5
10/18/10 at 4:43am

Antek

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post #5 of 5
10/19/10 at 12:14pm
Thread Starter 

ah, antek was the vendor i was trying to remember. Thanks.

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