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Old 22nd May 2004, 05:13 PM   #11
bellx is offline bellx  South Africa
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Default Substitution

What can be substituted for the TC7WH04FU, TC7WH08FU and LT1220CS8 in th IRF circuit?
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Old 13th June 2004, 03:43 PM   #12
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THE CIRCUITS TC7WH04FU, TC7WH08FU,IR2011 CAN REPLACE BY THIS?
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Old 13th June 2004, 07:20 PM   #13
bellx is offline bellx  South Africa
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Default looks simple enough

I have built a prototype of my own class D amp, works very well with just 2 fets but I'm having problems with paralleling more fets, it gets unstable. Mean while I shall try this self oscillating design.
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Old 14th June 2004, 09:49 AM   #14
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Hi,

has anyone had any luck downloading that book at
http://doc.utwente.nl/fid/1351 ??

I get the first page and then it just hangs.

Thanks,
Chris
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Old 14th June 2004, 12:40 PM   #15
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HI bellx
I think you confused with class-AB & class-D amplifier,Is you
need more power you must increased voltage, one pair mosfet is
enough to drive up to 1 kw on half bridge configuration,so now I just
strat my class-D amplifier project,voltage +/- 130-150v ,mosfet use
irf450 ,power supply user ETD 49 CORE with ir2153 self oscillation
driver can up to 400W /4 ohm,but power supply design is not completed
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Old 14th June 2004, 01:20 PM   #16
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Quote:
Originally posted by GEORGE HO
HI bellx
I think you confused with class-AB & class-D amplifier,Is you
need more power you must increased voltage, one pair mosfet is
enough to drive up to 1 kw on half bridge configuration,so now I just
strat my class-D amplifier project,voltage +/- 130-150v ,mosfet use
irf450 ,power supply user ETD 49 CORE with ir2153 self oscillation
driver can up to 400W /4 ohm,but power supply design is not completed
Hi,

IRF450.....500V, 13 amps? RdsOnb .4ohms....seems kind of high..if you doubled them up...you could have 26 amps.... 0.2ohms...which still seems high, but there is at least a reason for doing it.

Bit harder to drive though.

I think the prefered solution seems to be, find a better mosfet, which can be a real pain, but in the end the payoff is large.

Your amp sounds interesting...I'd like to know how that controller works for you.

Good luck,

Chris
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Old 15th June 2004, 06:10 PM   #17
Steven is offline Steven  Netherlands
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Quote:
Originally posted by classd4sure
Hi,

has anyone had any luck downloading that book at
http://doc.utwente.nl/fid/1351 ??

I get the first page and then it just hangs.

Thanks,
Chris
No problem at all. Just tried again and received all 128 pages.

Steven
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Old 15th June 2004, 06:33 PM   #18
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Hi Steven,

I'm still unable to download it today...same thing I get the first page and it hangs, not a problem I usually have.

It's alright though I had a friend try the link out and he was able to download it for me and sent it over.

Thanks for the link it's a great read.

Chris
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Old 15th June 2004, 07:12 PM   #19
Steven is offline Steven  Netherlands
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You're welcome.

Steven
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The Analog Art shows no sign of yielding to the Dodo's fate. The emergence and maturation of monolithic processing finesse has perhaps lagged a bit behind the growth of the Binary Business. But whereas digital precision is forever bounded by bits, there is no limit excepting Universal Hiss to the ultimate accuracy and functional variety of simple analog circuits. - Barry Gilbert, 1973
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Old 16th June 2004, 11:12 PM   #20
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HI Chris
http://doc.utwente.nl/fid/1351 ?? This page tried to save on
disk,do not open it .


GEORGE HO
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