Building a power supply unit.
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 5th August 2003, 01:19 AM #1 S.C   diyAudio Member   Join Date: Jun 2003 Location: Milpitas Building a power supply unit. If i want to make a psu with two transformer, can I use only one female power pot? Parallel connect it to them. Am I using one fuse also?
 5th August 2003, 08:17 AM #2 jh6you Account Disabled   Join Date: Aug 2002 Location: Near to the Pacific Ocean Yes and yes. I have made so without any tech problem. :yinyanng:
 6th August 2003, 02:53 AM #3 S.C   diyAudio Member   Join Date: Jun 2003 Location: Milpitas Last few questions, 1. You guys said 160VA-250VA(watt) per channel will be enough "save". Does it apply to the transformer before bridge or after? As an example, 1. a 250VA Transformer 115V Primary, 25V/25V Secondary, and 10A. Bridge: *1.414. Finally = (25*1.414)V*10A = 353.5 Or 2. a 250VA PSU, Transformer: Pri: 115V, Sec: 17.7V/17.7V, and 10A, Bridge: *1.414. Finally = (17.7*1.414)V*10A = 249.4VA? Which one is right? 2. Does Secondary Voltage important to match the datasheet's graph? Or I just need to get enough VA(watt) rating? Ex: Speaker: 10 Ohm, 35W. Target Power supply 20V Power rail 26- 28V each. Transformer A: Pri 115V, Sec 20V/20V, 12.5A Bridge: *1.414 = (20*1.414)V12.5A = 353.5VA Per Channel Or Transformer B: Pri 115V, Sec 12V/12V, 20.8A Bridge: *1.414 = (12*1.414)V20.8A = 352.9VA Per Channel 3: If I am going to have some high current transformer such as above. Can a 3.15A fuse handle it, like Nuuk's site suggested? How is fuse work? My guess: If it break when there is more than 3.15A go through it, then I should use higher rating fuse for those high current transformer, right? All those through are my guessing only. Plz correct me, and my math. Feel Free to comment.
 6th August 2003, 05:52 AM #4 Mad_K   diyAudio Member     Join Date: Sep 2002 Location: Norway #before bridge 250VA 2*18V => 250/(18+18)=6,94A VA=2*18*6,94=250VA __________________ Mads K
 6th August 2003, 08:59 PM #5 S.C   diyAudio Member   Join Date: Jun 2003 Location: Milpitas Thx Mad_K, Can anyone answer the last two questions?

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