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Old 5th February 2013, 10:42 AM   #11
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A linear regulator at 25A !!!! Most regs need a drop-out of about 3V - that would be 75 x 2 = 150W of heat.

I was thinking that a 45V circuit would probably tolerate 48V.

It probably doesn't need to be stabilised anyway.
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Old 5th February 2013, 10:47 AM   #12
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I would answer with 3 words
Difficult
Expensive
Dangerous


uhhh.... the acronym is purely coincidental
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Last edited by sofaspud; 5th February 2013 at 10:52 AM.
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Old 5th February 2013, 11:55 AM   #13
JMFahey is offline JMFahey  Argentina
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Why getting +/-45V (or whatever) out of a 12/15V supply?
Why double efforts?
Why not straight from a 120/240 VAC wall outlet?
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Old 5th February 2013, 12:07 PM   #14
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AH No ones figured it out yet?

Want to build multi channel amp for the car. fedup of cheap car amps and thought about running some Quad 405 channels or build my own. I guess I could use one dc-dc per channel. I ultimatly want to use 15 channels of amplification. but would start with 4 then to 6 then to 12 and possibly upto 15. so thought one or two large supplies would be better but sounds as though it might be easier to make them full monoblocks with PSU for each.
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Old 5th February 2013, 12:13 PM   #15
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class D?
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Old 5th February 2013, 12:13 PM   #16
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Quote:
Originally Posted by JMFahey View Post
Why getting +/-45V (or whatever) out of a 12/15V supply?
Why double efforts?
Why not straight from a 120/240 VAC wall outlet?
might need a l-o-n-g cord
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Old 5th February 2013, 12:42 PM   #17
JMFahey is offline JMFahey  Argentina
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Nice to know .... in the 14th post !!!

And the 12/15V 25A spec *hints* at some kind of surplus PSU trying to find a job.
Simply stating "Car Battery" would have been much clearer from the beginning

Last edited by JMFahey; 5th February 2013 at 12:46 PM.
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Old 5th February 2013, 12:45 PM   #18
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Quote:
Originally Posted by JMFahey View Post
Nice to know .... in the 14th post !!!
no kidding.

but i kinda expected something of that nature...............
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Old 5th February 2013, 12:47 PM   #19
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Sorry Chaps consider wrists Slapped

TBH Didn't think it really matters what the device is at the end of the supply. I've always treated psu and device as 2 things so appologies if its made things difficult. I guess its quite a differant thing having a sustained load vs a dynamic. However I would really like to have something that will cope. I'm just fedup of colapsing voltage rails due to under specification. On the flip side Having not worked with switchmode before a heavily dynamic load could casue simmilar issues?

Not really up for class D on the amp stage. I dont know maybe but I have been running a 405 in the boot with an inverter to mains and been very happy so thats making me want to go along the lines of build proper psu and go from there.

Last edited by Graemedench; 5th February 2013 at 12:49 PM.
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Old 5th February 2013, 12:56 PM   #20
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Is the output +/- 45V supposed to be minimum, maximum or absolutely constant?
If not absolutely constant, how much can it vary?
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