Anyone know a good source for cheap transformers?

aletheian · 26th October 2005, 10:14 PM

I am building up a bridged (or parallel...dunno yet) lm3886 amp, and I want to milk as much wattage as I can from the suckers, so I'd like to put around 36v on them. I rigged up a bipolar power suply from a 24-0-24 3A (144VA) tranny I had to test out one of them. I got about 35.4 volts loaded and found it to me most deficient in the current department...sag city!

So I guess I need Something more like a 25-0-25 4A tranny for each chip... or a single 25-0-25 8A for the pair. I'd even go with two 25-0 trannies at 4A each if it is cheaper.

Anyone have a good source for cheap trannys like this other than cannabalizing old printers?

planet10 · 27th October 2005, 01:39 AM

Try ApexJr?

I'm sitting on a whack of 12VAC ~6A trafos (estimate based on the 20VA/ib rule of thumb). You'd need to stack 4 for your application.

dave

bigmike216 · 27th October 2005, 03:57 AM

How much?

planet10 · 27th October 2005, 04:03 AM

$5 USD each + post?

dave

26th October 2005, 10:14 PM	#1
aletheian diyAudio Member Join Date: Apr 2004 Location: Philly	Anyone know a good source for cheap transformers? I am building up a bridged (or parallel...dunno yet) lm3886 amp, and I want to milk as much wattage as I can from the suckers, so I'd like to put around 36v on them. I rigged up a bipolar power suply from a 24-0-24 3A (144VA) tranny I had to test out one of them. I got about 35.4 volts loaded and found it to me most deficient in the current department...sag city! So I guess I need Something more like a 25-0-25 4A tranny for each chip... or a single 25-0-25 8A for the pair. I'd even go with two 25-0 trannies at 4A each if it is cheaper. Anyone have a good source for cheap trannys like this other than cannabalizing old printers? __________________ Heghlu'meH QaQ jajvam!

27th October 2005, 01:39 AM	#2
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	Try ApexJr? I'm sitting on a whack of 12VAC ~6A trafos (estimate based on the 20VA/ib rule of thumb). You'd need to stack 4 for your application. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

27th October 2005, 04:03 AM	#4
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	$5 USD each + post? dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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27th October 2005, 03:57 AM	#3
bigmike216 diyAudio Member Join Date: Jul 2004 Location: BC, Canada	How much?

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