SMPS 12v to +-70V

gcds · 16th January 2009, 08:40 PM

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

jtkraj · 19th January 2009, 05:50 AM

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.

Eva · 19th January 2009, 06:04 AM

The power supply required is way too big for a first SMPS project. You should gain experience by making smaller stuff first.

megajocke · 19th January 2009, 05:55 PM

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)

16th January 2009, 08:40 PM	#1
gcds diyAudio Member Join Date: Mar 2007	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

19th January 2009, 06:04 AM	#3
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	The power supply required is way too big for a first SMPS project. You should gain experience by making smaller stuff first. __________________ I use to feel like the small child in The Emperor's New Clothes tale

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19th January 2009, 05:50 AM	#2
jtkraj diyAudio Member Join Date: Jun 2008	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.

19th January 2009, 05:55 PM	#4
megajocke diyAudio Member Join Date: Jan 2003 Location: Solna	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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