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Old 12th October 2003, 02:19 AM   #1
sounder is offline sounder  Canada
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Default Two transformers instead of one CT?

Anyone know what the advantages or disadvantages are of using two seperate 24v transformers as opposed to using one 48v centre tapped transformer. I'm using it to power a bridged LM3875 inverted subwoofer amp and I happened to have access to two 24v 10A trannies.
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Old 12th October 2003, 04:21 AM   #2
AJT is offline AJT  Philippines
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Default try it and fid out

looks like you have 480va total for the two trafos, u can use that for parrallel/bridge gainclone amp using 4 lm3886's....disadvantage, you have to mount two trafos instead of one.....advantage, you can make a separate +/- 35volt supplies not possible with a ct, type....
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Old 12th October 2003, 04:34 AM   #3
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All wattage figures adding up the same, you can get pretty
much the same results with 2 bridges (1 for each secondary)
off of one larger transfer.

pass - still alternating between Goldfrapp and Pirates of the
Caribbean.
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Old 12th October 2003, 05:27 PM   #4
sounder is offline sounder  Canada
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Quote:
Originally posted by Nelson Pass
All wattage figures adding up the same, you can get pretty
much the same results with 2 bridges (1 for each secondary)
off of one larger transfer.

pass - still alternating between Goldfrapp and Pirates of the
Caribbean.
Thanks for the reply Nelson,

Attached is the configuration of the amp/PS I have plagiarized from various sources. The amp is directly from National's application sheet AN1192. I built the PS and amp last night and how should i put it..I solved the PS problem. The amp, which I built verbatim heats up the "smallish" heat sink in about 4 seconds. Toasty. It also has a serious oscillation (motorboating). Starts low hz and increases. I have 2x1000 uF caps for each chip. Anything that jumps out as a potential problem?


David

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File Type: jpg bridged.jpg (54.8 KB, 188 views)
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Old 12th October 2003, 08:23 PM   #5
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1000 uF for each rail seems a little too little according to most people. You loose some power if the ripple is too high.
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