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Old 12th June 2005, 04:50 PM   #1
sss is offline sss  Israel
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Default regulated supply +- 28V -20A

hello guys
i made a power amp using opa549 chips , bridged stereo
now the chips max voltage is -+ 30V my traffo makes more , so i need to regulate it , now i need 20amp and i dont know what device(s) to use , any help will be appriciated
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Old 12th June 2005, 07:50 PM   #2
AndrewT is offline AndrewT  Scotland
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Hi,
can you alter the transformer? Remove turns to reduce it's output.
How about adding a capacitance multplier? You can adjust the output voltage by varying the dropper resistors feeding the base of the pass transistor. Some contributors don't like this as a solution.
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Old 12th June 2005, 08:04 PM   #3
sss is offline sss  Israel
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nah ...
i'll stick to a regulated supply , i just dont know what device will give me 20A , maybe i'll make a regulator from scratch , with power transistors and an op amp
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Old 13th June 2005, 08:41 AM   #4
Danko is offline Danko  Hungary
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how much is the regulatoed puffered voltage on your powersupply?
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Old 13th June 2005, 08:58 AM   #5
sss is offline sss  Israel
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i need +-30V regulated @20A
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Old 13th June 2005, 09:11 AM   #6
Danko is offline Danko  Hungary
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and how much voltage does your trafo make?
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Old 13th June 2005, 09:21 AM   #7
sss is offline sss  Israel
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i got many m one makes -+35V and one makes -+42V after rectifier (DC)
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Old 14th June 2005, 03:28 AM   #8
venki is offline venki  India
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try this ckt it is easy. The emitter of the transistor forms the output. You can use the same for negative supply also. hope this helps

Venki.
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Old 14th June 2005, 07:30 AM   #9
AndrewT is offline AndrewT  Scotland
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Hi,
if you want the reg to survive a short you will need to put at least 600watts of (maybe 1000w after temp derating) of output Trs in parallel and enormous heatsinks or use fold back current limiting or a slow blow fuse <= to max output current.
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