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Bent 28th July 2005 01:43 AM

FS: SMPS 50-0-50 regulated DC

I have 10 amplifier SMPS's for sale. I would use them except they are 110vAC and I am in Australia :-( where the voltage is 240vAC

50-0-50v DC @ at least 3.5 amps continuous, but these were made for a 4 ohm Class AB subwoofer rated at 180wRMS so there is plenty of current potential. They are regulated and rock solid on their voltage when at 3.5 amp load.

There is also a 2 amp current limited supply at 25-0-25v DC.

They are built by ALESIS for audio, so be quick, they are really nice.

Oh, US$60/ea delivered worldwide anywhere! that is definately a bargain - they are new also!

Cheers, Graeme (

Bent 29th July 2005 06:50 AM

No takers? I am surprised, these are really great items

Is the price too high or too low? seems like a good deal to me.

I am open to hearing offers.

Best, Graeme

Jan Dupont 29th July 2005 12:57 PM

Do you have a picture ;)

Bent 1st August 2005 01:36 AM

2 Attachment(s)
Hi, I guess that is a fairly good idea.

The SMPS is physically small which is great!

About 15cm x 8cm x 7cm at a guess.

please see attached picture

Eva 1st August 2005 02:05 AM

This SMPS looks like the classic half bridge used in AT and ATX PC PSUs. In other words: There may be a way to wire it for 240V operation.

Bent 2nd August 2005 03:37 AM

Hi Eva,

Thanks for that info.

I would like nothing more than to set it up for 240v operation, unfortunately my understanding ofb the SMPS is not enough.

Maybe I will look for a hualf bridge circuit and compare.

Many thanks, Graeme

Eva 2nd August 2005 03:46 AM

If I'm right about the circuit, then it can be configured for 115V or 230V operation depening on how the diode bridge (that four-legged thing in the left side of the heatsink) and those two big capacitors are wired.

This is a typical schematic showing 115V/230V selection. The "input filter" is inside that steel or iron box in the left side. D21, D22, D23 and D24 constitute the diode bridge. C5 and C6 are those two big capacitors. You may even find a PCB jumper for voltage selection in place of the switch shown in the schematic.

Bent 25th August 2005 08:08 AM

Thanks eva
Thanks for your advice, the SMPS indeed does run on 110v fine - even when on the 240v setting!

I have re posted them for sale.

Mains caps are 350v @ 1200uF, pretty good!

Thanks again, Graeme

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