NEW MOSFET AMPLIFIER USING STW60N10 Picture

zox2003 · 11th March 2005, 12:46 AM

Here is 100W/4 ohm amplifier using STW60N10 in output.
Sounds great and works great.

Thanks .

sivan_and · 11th March 2005, 02:26 AM

zox2003 · 11th March 2005, 01:11 PM

So, any comments on amplifier or questions?

janneman · 11th March 2005, 01:28 PM

I think you need to wet the audience's appetite a bit.

Schematic? Anything special out of the ordinary? Tricks you did to solve a particular problem? Are these FETs special, or do they work better then others, and why?
Maybe a better quality pic?
How did you make the PCB, any tips we can use? That sort of thing.

Jan Didden

richie00boy · 11th March 2005, 01:39 PM

Took the words right out of my mouth Jan.

Looks neat but more info needed

zox2003 · 11th March 2005, 02:03 PM

Ok.

I attached schematic in .pdf.
I experienced little problem with this amp.
Without load on output ( 4 ohms) everything is OK.I can adjust q-current and output voltage is almost 0.0 V.But when I connect load and start increasing power voltage to aprox. +/- 10V positive rail start to suck high current while negative is still low and I can not adjust that quiscent current any more.Negative rail MOS is cold-positive rail MOS is getting hot.I did not even try to increase voltage higher.
Please HELP.

quasi · 11th March 2005, 02:21 PM

Hi zox2003

I have never set up this amp by turning the voltage up slowly and this is not the correct way of setting it up.

Before we get to the setting up phase though, please verify that transistor Q8 is mounted on the main heatsink and so are your output devices. Verify also that the output FETS are fully isolated from the heatsink by insulating pads. You can check this by placing one meter probe on the heatsink and the other on the middle lead of the output FETs.

Please check this first and go over your work again to verify component placement.

It looks as though you have substituted many parts in this cct. If you send me a list of what you replaced I'll verify their suitability.

Sorry we need to do this first before we turn it on again.

Good Luck

richie00boy · 11th March 2005, 02:25 PM

Have you been looking at quasi's schematics...

No obvious errors that I can see.

zox2003 · 11th March 2005, 02:26 PM

Hi,

I used common part.Drivers are TIP31 and TIP32 that is only change.Everything was checked and looks fine.

Thanks.

zox2003 · 11th March 2005, 02:46 PM

Very interesting:

I placed 1N4001 diode in paralell with emiter resistor of Q9 (220 ohms and now I do not have that problem any more.
Answer???

Also sometimes when I turn amp on output voltage goes slowly from full rail voltage to 0Volts.Problem with voltage source for input stage or what?

11th March 2005, 02:26 AM	#2
sivan_and diyAudio Member Join Date: Dec 2004 Location: Dxb / India	__________________ SivanandBalan

11th March 2005, 01:11 PM	#3
zox2003 diyAudio Member Join Date: Nov 2004 Location: usa	Comments? So, any comments on amplifier or questions?

11th March 2005, 01:28 PM	#4
janneman diyAudio Member Join Date: May 2002 Location: Where Germany, The Netherlands and Belgium meet Blog Entries: 6	I think you need to wet the audience's appetite a bit. Schematic? Anything special out of the ordinary? Tricks you did to solve a particular problem? Are these FETs special, or do they work better then others, and why? Maybe a better quality pic? How did you make the PCB, any tips we can use? That sort of thing. Jan Didden __________________ /Another new issue: Linear Audio Volume 3!

11th March 2005, 01:39 PM	#5
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Took the words right out of my mouth Jan. Looks neat but more info needed __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

11th March 2005, 02:21 PM	#7
quasi diyAudio Member Join Date: Sep 2004 Location: Adelaide, Australia	Hi zox2003 I have never set up this amp by turning the voltage up slowly and this is not the correct way of setting it up. Before we get to the setting up phase though, please verify that transistor Q8 is mounted on the main heatsink and so are your output devices. Verify also that the output FETS are fully isolated from the heatsink by insulating pads. You can check this by placing one meter probe on the heatsink and the other on the middle lead of the output FETs. Please check this first and go over your work again to verify component placement. It looks as though you have substituted many parts in this cct. If you send me a list of what you replaced I'll verify their suitability. Sorry we need to do this first before we turn it on again. Good Luck __________________ http://sites.google.com/site/quasisdiyaudiosite/


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11th March 2005, 02:25 PM	#8
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Have you been looking at quasi's schematics... No obvious errors that I can see. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

11th March 2005, 02:26 PM	#9
zox2003 diyAudio Member Join Date: Nov 2004 Location: usa	PARTS? Hi, I used common part.Drivers are TIP31 and TIP32 that is only change.Everything was checked and looks fine. Thanks.

11th March 2005, 02:46 PM	#10
zox2003 diyAudio Member Join Date: Nov 2004 Location: usa	Maybe fix? Very interesting: I placed 1N4001 diode in paralell with emiter resistor of Q9 (220 ohms and now I do not have that problem any more. Answer??? Also sometimes when I turn amp on output voltage goes slowly from full rail voltage to 0Volts.Problem with voltage source for input stage or what?

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