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Old 11th March 2005, 12:46 AM   #1
zox2003 is offline zox2003  United States
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Lightbulb NEW MOSFET AMPLIFIER USING STW60N10 Picture

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

Thanks .
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Old 11th March 2005, 02:26 AM   #2
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Old 11th March 2005, 01:11 PM   #3
zox2003 is offline zox2003  United States
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Talking Comments?

So, any comments on amplifier or questions?
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Old 11th March 2005, 01:28 PM   #4
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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.

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Old 11th March 2005, 01:39 PM   #5
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Took the words right out of my mouth Jan.

Looks neat but more info needed
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Old 11th March 2005, 02:03 PM   #6
zox2003 is offline zox2003  United States
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Talking Schematic and help

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.
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Old 11th March 2005, 02:21 PM   #7
quasi is offline quasi  Australia
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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
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Old 11th March 2005, 02:25 PM   #8
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Have you been looking at quasi's schematics...

No obvious errors that I can see.
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Old 11th March 2005, 02:26 PM   #9
zox2003 is offline zox2003  United States
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Talking PARTS?

Hi,

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

Thanks.
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Old 11th March 2005, 02:46 PM   #10
zox2003 is offline zox2003  United States
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Unhappy 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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