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Old 16th January 2009, 07:40 PM   #1
gcds is offline gcds  Lithuania
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Default SMPS 12v to +-70V

Need SMPS schematic or tutorial how to make smps for audio amplifiear
V in = 12v
V out = 70v -/+
I = 18A
amp schematic: http://i7.ebayimg.com/07/i/000/e4/85/5334_3.JPG
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Old 19th January 2009, 04:50 AM   #2
jtkraj is offline jtkraj  India
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Did you actually mean I out is 18A. I am not sure how practical this is. you can do this but need lots and lots of care in wiring.

have you considered that this will need a 105A of input current?

better option will be not go for an isolated power supply. Use Buck boost for this purpose.
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Old 19th January 2009, 05:04 AM   #3
Eva is offline Eva  Spain
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The power supply required is way too big for a first SMPS project. You should gain experience by making smaller stuff first.
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Old 19th January 2009, 04:55 PM   #4
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The amp schematic contatins some errors too. (Vbe multiplier won't work and the left transistor in the second LTP/VAS has too low voltage rating, needs to be MJE type too)
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