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Old 18th January 2004, 08:34 PM   #51
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in practice (i was about to say "in theory"), what is the highest voltage rails you could have (DC)?

230vAC x 1.41 = 324.3vDC

using 2 seperate mains feeds, you could get +/-324vDC. this would be okay with 400v output devices, but could you get other components to work at this voltage?
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Old 18th January 2004, 09:17 PM   #52
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Quote:
Originally posted by Matttcattt
using 2 seperate mains feeds, you could get +/-324vDC. this would be okay with 400v output devices,
with +/- 324v DC, you are talking about potential voltage drops on the output devices of 324vx2=650v before any safety factors.

Realistically, you are probably talking about 1000v Vce/Vds devices. they are probably difficult to find and you may have to parallel a lot of them to drive 8ohm speakers,
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Old 30th January 2004, 11:26 AM   #53
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Arrow Commentable Thoughts

Hi Samuel Jayaraj

How about ur project is going.

Doing well or not????

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Ampman
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Old 30th January 2004, 03:01 PM   #54
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I think there's a way you can cascade a set of transistors vertically, so that they can stand more voltage all together.

I rarely see this used in audio, but I know that it's been done.

At least it's a relatively useful way to make 250V transistors work in a 650V amplifier.
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Old 30th January 2004, 07:24 PM   #55
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Default Burn up?

Hi amp_man_1

I like your schematic, but I notice that the bias voltage is set only using a pot, hence there can be no thermal tracking. Isn't this unwise with such a high power design and BJTs?
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Old 30th January 2004, 09:16 PM   #56
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Default 1000W RMS Power Amp

As someone who builds 1000W amps every day, I have had spectacular resilts with the ICEPower modules from B&). The 1000A costa us less than US$100.00 a unit.

As well, the 1000ASP is available to us for under US$200.00 and it includes a regulated switching 120/240V Power supply. Plus, the 1000ASP power supply has enough power capacity, it can drive a 1000A module, giving you 2000W of sub woofer power.

Alternately, it can drive 2 of the 500A modules to give you plenty of mid and high on a tri-amp system.

The prices are 100+ OEM prices. You will have to lookaround to see who may sell them. See:

http://www.powerhouse.bang-olufsen.com/sw1022.asp
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Old 30th January 2004, 11:08 PM   #57
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Quote:
Originally posted by Matttcattt
in practice (i was about to say "in theory"), what is the highest voltage rails you could have (DC)?

230vAC x 1.41 = 324.3vDC

using 2 seperate mains feeds, you could get +/-324vDC. this would be okay with 400v output devices, but could you get other components to work at this voltage?

maybe i will re-write my question. what would be the highest rail voltage (DC) that you would use?
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Old 31st January 2004, 03:29 AM   #58
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Default Re: Burn up?

Quote:
Originally posted by richie00boy
Hi amp_man_1

I like your schematic, but I notice that the bias voltage is set only using a pot, hence there can be no thermal tracking. Isn't this unwise with such a high power design and BJTs?
Sir , The thermal Tracking is very well performed by diode connected transistors which are mounted on heatsink.

If u insist , I can also put a Vbe multiplier using transistor.


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Old 31st January 2004, 06:05 PM   #59
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Thank you amp_man. I would have thought that a Vbe muliplier would be a better way to do it than the 2 diode-connected transistors + pot?

Also, why is Q3 and Q4 on the o/p stage made from paralleled devices? A single device would easily handle current required, I would think.
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Old 1st February 2004, 10:33 AM   #60
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Quote:
Originally posted by richie00boy
Thank you amp_man. I would have thought that a Vbe muliplier would be a better way to do it than the 2 diode-connected transistors + pot?

Also, why is Q3 and Q4 on the o/p stage made from paralleled devices? A single device would easily handle current required, I would think.
Hey man
The parallel drivers play their role when someone is driving 2 Ohms load at low frequency , therefore for ample current drive requirements the paralleling is required.

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Ampman
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