Cheap SMPS PSUs for class D modules.

[Spasticteapot]

I figure that links to cheap PSUs would be very handy, so here's what I've found:

1. 100w 24v SMPS power supply - $40.
http://www.web-tronics.com/1024siouposu.html

2. 3.3, 7, 5, and 12v power supply. 4A on 12v line. - $10.
http://www.weirdstuff.com/cgi-bin/item/22133

Now, if someone could find a cheap 30-32v PSU...

 

[bcrescen]

Purchased this a while back for a gainclone. I haven't built the gainclone but the price is right and the seller is very helpful. Seller provides parts for a mod that reduces the voltage to 38v.

http://cgi.ebay.com/Switching-Power...6721255QQihZ014QQcategoryZ36323QQcmdZViewItem

 

[Fin]

Purchased this a while back for a gainclone. I haven't built the gainclone but the price is right and the seller is very helpful. Seller provides parts for a mod that reduces the voltage to 38v.

http://cgi.ebay.com/Switching-Power...6721255QQihZ014QQcategoryZ36323QQcmdZViewItem

Would this be a suitable supply for an EB-TA0103
EB-TA0103

 

[bcrescen]

It has a 5V output and the +- rails are within the Tripath required range. There is a link in the Ebay listing that provides additional documentation that might help you. I'm new to diy amps (couple 41hz amp3 and SI mod). I'm going to try this with a LM3886 P2P. I did the mod and it gives me 38v. High for the LM3886 but below the max voltage. For my minimal investment I'm willing to plug it in and see what happens. You might want to be more cautious.

 

[Fin]

Hi bcrescen

The TA0103 can use +/-35 to +/-54V....so these are right in the middle of that range...so I assume that is OK.

My main concern was the amount of power that these SMPS can supply. Most others building amps with TA0103, TA0104 and TA3020 seem to be using large torroidal transformers of around 600VA to 1000VA. The Tripath datasheet mentions something about requiring 7A at +/-45V....but that seems to be at full power - which I don't intend to use.

Anyway - I decided to buy two of those SMPS and will try them in parallel. That should give me +43V @ 4A and -43V @ 4A. Hopefully it will be good enough for typical use at reasonable levels.

BTW - thanks for the link to the SMPS.

 

[vectorplane]

finding the eBay SMPS

The link provided points to an expired listing.

Fortunately ebay keeps the records of old listings around for a while after the end of auctions, so I could re-trace that SMPS with a search for items by same seller.

Rather than searching by item nr, which changes all the time, you may be better off searching by keywords in the title, which doesn't seem to change:

"Switching Power Supply Dual +/-43V 2A >Audio power amp",

or by seller id "stadholder"

vectorplane

 

[Spasticteapot]

Here's an 8-amp 24-volt power supply for $35.

http://www.herbach.com/Merchant2/merchant.mv?Screen=PROD&Store_Code=HAR&Product_Code=TM00PWS4420&Category_Code=PWS

And here's a 6-amp +/-12v power supply for $15.

http://www.herbach.com/Merchant2/merchant.mv?Screen=PROD&Store_Code=HAR&Product_Code=TM02PWS4574&Category_Code=PWS

 

[Spasticteapot]

Here's an 8-amp 24-volt power supply for $35.

http://www.herbach.com/Merchant2/merchant.mv?Screen=PROD&Store_Code=HAR&Product_Code=TM00PWS4420&Category_Code=PWS

And here's a 6-amp +/-12v power supply for $15.

http://www.herbach.com/Merchant2/merchant.mv?Screen=PROD&Store_Code=HAR&Product_Code=TM02PWS4574&Category_Code=PWS

 

[vectorplane]

H&R has some interesting stuff, but it's expensive for surplus.

Those supplies aren't very good value considering the low output voltages.

When you go to class D, you don't do it for 20W output.

So you need hefty voltages.

 

[Spasticteapot]

H&R has some interesting stuff, but it's expensive for surplus.

Those supplies aren't very good value considering the low output voltages.

When you go to class D, you don't do it for 20W output.

So you need hefty voltages.

+/- 12v is equivalent to 24v at six amps - not huge, but not too bad, either.

 

[vectorplane]

Yes, I meant the 24V.
It's not the same as +/- 45V

Not too many people out there building Class D (or any class for that matter) amps with 24V supplies.