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Old 9th April 2005, 11:41 AM   #21
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With 16 parallel devises of the MJL4302/MJL4281 pair and 100V rails you will be able to safely drive both 4 and 8 ohms.

This will need a huge heat sink, but should work fine.

\Jens
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Old 9th April 2005, 11:45 AM   #22
edl is offline edl  Hungary
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psu for one channel

(if you can get 22000uF/63V caps, then use them instead of 2*10000uF.)
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Old 9th April 2005, 12:11 PM   #23
edl is offline edl  Hungary
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amp schema.

only one pair of output devices shown. (you will need 5 pairs)
short-circut protection isn't included too. that's so simple: 6 resistor, 4 diodes, 2 transistor, 2 caps...
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Old 9th April 2005, 12:28 PM   #24
RogerG is offline RogerG  United States
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Thanks, guys.
I talked with a friend yesterday who is into Marshall pro gear. He said that they are making some 500w models on 80v rails. I haven't looked into it yet. Just wondering why 100v is your figure, not discounting you.
EDL, you images did not appear on your posts. I'd love to see them. You can email them to me if you'd like.
5 pair of o/p is not too bad. I expected 6-10 pair for stability at that power level. I've not used the peices you mentioned before but will try them for sure. I still think about common TO-3's when I think about bipolars. It's just what I've used most.
Thanks for your help, again! This site rocks!

Roger
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Old 9th April 2005, 12:52 PM   #25
edl is offline edl  Hungary
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hello Roger!

500W on 8ohm means 89,5V peak voltage. The losses are: 11,18V ripple voltage if the caps are 10000uF per rail, 3V: output transisitor "Uce-loss", 1V for emmiter resistor, 1V for rectifier.
So 90V+11V+3V+1V+2V=106V
This is the need for idle rail voltage. So you need a 2*75V-AC transformer.

80V rails (if they aren't stabilized) is enough for 280-300W-RMS (8ohm) power.
I think these amp's are working for 4ohm loudspeakers, so they give 450-500W RMS power on 4ohm.


I'll post the pics in another way.
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Old 9th April 2005, 08:37 PM   #26
AndrewT is offline AndrewT  Scotland
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Hi,
+-10mF seems a lot low for a peak current of 11.2A.
I would suggest at least +-20mF or preferably +-30mF for a 500W amp.
I would go for bridged as suggested by others, save a fortune in caps alone and make the overall design easier to achieve.
212vDC inside that case OUCH!!.
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Old 9th April 2005, 09:15 PM   #27
edl is offline edl  Hungary
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for 33000uF caps per rail you'll need only 98V. that means a 2*69V-AC trafo.


anyway I would suggest you to build two 400W-8ohm-RMS amp.
this way you will need 89V rails (2*89V-AC trafo, rated at 600VA) if you use two 22000uF/100V caps per rail.
400W would be easier, because:
-you can use 200V output devices (for example mj15022/23)
-you can easly buy 100V rated filter caps

Rembember that Andrew wrote: 200-220V DC is between the rails! thats really dangerous! (60V can be sometimes lethal!)
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Old 9th April 2005, 09:17 PM   #28
edl is offline edl  Hungary
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difference between 400W and 500W is only 1dB! you wouldn't hear this diff!
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Old 10th April 2005, 03:01 AM   #29
RogerG is offline RogerG  United States
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Quote:
Originally posted by edl
difference between 400W and 500W is only 1dB! you wouldn't hear this diff!
That is true. What I am concerned about is the drivers being rated 500wrms. I've killed many a voice coil with half it's power rate, but never with more. I all ways try to over power a speaker and keep the volume control down. (overpower=10-20% more power than rated rms)
Even the high quality amps I've used don't seem to drive large, high power woofers very well at loud levels. So I was hoping to get close to their rating.
As for the high voltage, I don't mind working with it. I do it all day long. But I don't want to be locked in to buying specailty caps and toro's. Plus, I do like to use the TO-3's for outputs. These posts have given me much to think about. I'll contact pyle to see what they think about 400w instead of 500w. But I think it's a better idea, anyway. Thanks again guys,

Roger
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Old 10th April 2005, 04:10 AM   #30
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Here's a 550 watter

Can you describe your speakers better?
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