Its finally time for SkinnyBoy to make an amp...

SkinnyBoy · 8th June 2004, 07:02 AM

not because he NEEDs one, but because he has sixteen 4700uF 100volt chasis mount caps, and three 250VA transformers.... first things first, I need to buy another three toroidals... +-75 volt rails, I was thinking about the mosfet amp on Rod Elliots site... umm... will this amp give 600watts into 4 ohms?? or aren't the mosfets adequate enough? I think thats my only question for now..

Jean · 8th June 2004, 07:05 AM

have you looked at http://www.aussieamplifiers.com/ampkits.htm ?

SkinnyBoy · 8th June 2004, 07:24 AM

Quote:

Originally posted by Jean
have you looked at http://www.aussieamplifiers.com/ampkits.htm ?

hmm... I'll think about it.... lol

SkinnyBoy · 8th June 2004, 12:57 PM

well... that went well.. lol

and I have a question reguarding those amps... they say in the PDF (I am refering to the 800watt amp btw) that a toroidal transformer with a load voltage of 65volts AC is required... right? well... is that at full load or what? I just measured my 9 + 9 volt 250va toroidals, and with about 12amps on one secondary, the voltage dropped to 8 volts... which would mean I would need 8 transformers total... but, then the no load voltage is 9.3 volts..... which means the DC voltage will exceed the reccomended capacitors suggested in the PDF file (it suggests 100volt) OR does it mean 65volts AC, but NOT at FULL load... inwhich case I COULD use 7 transformers total.. lol SEEYA!

Jay · 8th June 2004, 02:31 PM

Oh, skinnyBoy.... I thought you were designing your own amp that I felt so jealous with your learning curve

But I'm not worry now hehehe

SkinnyBoy · 8th June 2004, 02:34 PM

Quote:

Originally posted by Jay
Oh, skinnyBoy.... I thought you were designing your own amp that I felt so jealous with your learning curve But I'm not worry now hehehe

haha, no.. nothing to worry about

maybe oneday... probably not though... whats the point? my friend at Uni was doing that, he had no idea what he was doing, so he came to me for help, I couldn't help, so he went and copied someones work from last year.. lol

rabbitz · 8th June 2004, 05:46 PM

Rod's mosfet P101 has max voltage of +/- 70V and it's rated at 250W RMS into 4 ohms with 380W peak.

600W......... what are you using this for??????

SkinnyBoy · 9th June 2004, 02:37 AM

Quote:

Originally posted by rabbitz
Rod's mosfet P101 has max voltage of +/- 70V and it's rated at 250W RMS into 4 ohms with 380W peak.

600W......... what are you using this for??????

yeah, good point... I didn't actually READ it, I was looking at the peak power table..

as for the AV800..... where can I get the mosfets? and how much are they? and.... if I have to match them, its abit annoying.... :S

SkinnyBoy · 9th June 2004, 03:35 AM

ok.... 7 transformers it is... lol making the AV800...

nominal rails of +-87 or so volts...... hmmmm

I don't like it....

8th June 2004, 07:02 AM	#1
SkinnyBoy Banned Join Date: Nov 2002 Location: Adelaide, Australia	Its finally time for SkinnyBoy to make an amp... not because he NEEDs one, but because he has sixteen 4700uF 100volt chasis mount caps, and three 250VA transformers.... first things first, I need to buy another three toroidals... +-75 volt rails, I was thinking about the mosfet amp on Rod Elliots site... umm... will this amp give 600watts into 4 ohms?? or aren't the mosfets adequate enough? I think thats my only question for now..

8th June 2004, 07:05 AM	#2
Jean diyAudio Member Join Date: Mar 2002 Location: Sacramento, CA	have you looked at http://www.aussieamplifiers.com/ampkits.htm ? __________________ left lane is for passing, slower traffic keep right please.

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8th June 2004, 12:57 PM	#4
SkinnyBoy Banned Join Date: Nov 2002 Location: Adelaide, Australia	well... that went well.. lol and I have a question reguarding those amps... they say in the PDF (I am refering to the 800watt amp btw) that a toroidal transformer with a load voltage of 65volts AC is required... right? well... is that at full load or what? I just measured my 9 + 9 volt 250va toroidals, and with about 12amps on one secondary, the voltage dropped to 8 volts... which would mean I would need 8 transformers total... but, then the no load voltage is 9.3 volts..... which means the DC voltage will exceed the reccomended capacitors suggested in the PDF file (it suggests 100volt) OR does it mean 65volts AC, but NOT at FULL load... inwhich case I COULD use 7 transformers total.. lol SEEYA!

8th June 2004, 02:31 PM	#5
Jay diyAudio Member Join Date: Feb 2003 Location: Jakarta	Oh, skinnyBoy.... I thought you were designing your own amp that I felt so jealous with your learning curve But I'm not worry now hehehe

8th June 2004, 05:46 PM	#7
rabbitz diyAudio Member Join Date: Jul 2003 Location: Newcastle, Australia	Rod's mosfet P101 has max voltage of +/- 70V and it's rated at 250W RMS into 4 ohms with 380W peak. 600W......... what are you using this for??????

9th June 2004, 03:35 AM	#9
SkinnyBoy Banned Join Date: Nov 2002 Location: Adelaide, Australia	ok.... 7 transformers it is... lol making the AV800... nominal rails of +-87 or so volts...... hmmmm I don't like it....

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