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Cheap PSU for M^3?

post #1 of 8
2/22/11 at 10:12am
Thread Starter 

Recently picked up a M^3, and looking to get a more suitable PSU for it. Using an ELPAC WM1024-760, and from what I can tell, it's a switching PSU, which is less than ideal for the M^3.

 

The WM080-1950-760 seems to be backordered everywhere, and Allied doesn't have any ETA on them, which leaves me with next to no choices. This Jameco one seems to work (24V, 0.5A, regulated linear), but can anyone confirm? https://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_174879_-1 If not, can anyone suggest a reasonably priced alternative?

 

I'm looking at building a sigma11 in the near future, but want to get my feet wet with a mini3 before handling something that's more advanced to build.

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post #2 of 8
2/22/11 at 10:31am

I thought the Elpac is linear actually, and it's definitely an option.

 

The Jameco one has been recommended before.

 

Building something like a Sigma11 would definitely be a good alternative, though it's considerably more expensive than a regular regulated wallwart.

 

You can always build something like a TREAD (simple LM317-based power supply).

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post #3 of 8
2/22/11 at 10:34am

AMB makes the sigma 25 which is his own version of something kind of sort of like the Tangent Tread which was the default M3 PS for quite some time. 

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post #4 of 8
2/22/11 at 10:45am
Thread Starter 
Quote:
Originally Posted by FallenAngel View Post

I thought the Elpac is linear actually, and it's definitely an option.

 

The Jameco one has been recommended before.

 

Building something like a Sigma11 would definitely be a good alternative, though it's considerably more expensive than a regular regulated wallwart.

 

You can always build something like a TREAD (simple LM317-based power supply).


Judging from the small size, I'd be inclined to say the WM1024 is a switching supply (isn't stated that it's linear anywhere, hence the uncertainty). And will probably spring for the Jameco one for now then, and build the sigma11 when I have more time/experience with the soldering iron.

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post #5 of 8
2/22/11 at 9:14pm

Before I built my sigma11, I was using an industrial strength linear PSU that I scored from eBay for like $10. Had gobs of power to spare, but the noise specs weren't ideal if I remember correctly. But still better than a switching one of course.

 

Anyway, just another option to consider.

http://business.shop.ebay.ca/i.html?_nkw=24&_sacat=58288&_sop=2&LH_PrefLoc=1&_odkw=&_osacat=58288&_trksid=p3286.c0.m270.l1313

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post #6 of 8
2/23/11 at 8:55am
Quote:
Originally Posted by nikongod View Post

AMB makes the sigma 25 which is his own version of something kind of sort of like the Tangent Tread which was the default M3 PS for quite some time. 


That little guy was designed for fairly low current, so heatsinking might be a problem at ~300mA for the M3, and assuming an absolute minimum dropout voltage of 2V.

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post #7 of 8
2/23/11 at 9:07am

5V drop and 300mA is only burning off 1.5W. Well withing the limits of a to220 device with small heatsink.

 

Running at the absolute limit of 2V across the device seems un-necessarily risky here, but only dissipates about 0.6W. There are many people who would run a TO220 part without a heatsink at that power level.

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post #8 of 8
2/23/11 at 9:13am
Quote:
Originally Posted by nikongod View Post

5V drop and 300mA is only burning off 1.5W. Well withing the limits of a to220 device with small heatsink.


I'll trust you on that, just wanted to be sure smile.gif

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