new amp total mosfet

kees52 · 4th May 2009, 09:45 PM

hi there

I have design this amp, through pass laps idee for drive with conventional mosfet for power.

so lets try it, it is simulated so not everything is exact.

distorsion is 0.005 in smulation.

greetz

Mr Evil · 4th May 2009, 09:58 PM

One problem stands out to me: You've use MOSFETs to make a current mirror (Q2/6/8), which doesn't really work very well because they have quite variable Vgs, which means the output current strongly depends on the particular devices used. If you want that to work, you will have to match the FETs, and you will also need some degeneration resistors.

Furthermore, the output current will vary with the supply voltage because the current is set only by the voltage across R4. You can improve that by connecting a capacitor across Q2 drain to the supply.

Wavebourn · 4th May 2009, 10:16 PM

Quote:

Originally posted by Mr Evil
One problem stands out to me: You've use MOSFETs to make a current mirror (Q2/6/8), which doesn't really work very well because they have quite variable Vgs, [...snip...]

I tried and fried; can post a picture of hole burnt in a chair by 10W 1Ohm resistor that unsoldered itself and fell down.

c2cthomas · 4th May 2009, 10:23 PM

Quote:

Originally posted by Wavebourn

I tried and fried; can post a picture of hole burnt in a chair by 10W 1Ohm resistor that unsoldered itself and fell down.

Good thing that hot resistor hit the chair!

Wavebourn · 4th May 2009, 10:35 PM

Quote:

Originally posted by c2cthomas

Good thing that hot resistor hit the chair!

Thanks! I would see it as soon as starts smocking!

Mr Evil · 4th May 2009, 10:56 PM

Quote:

Originally posted by Wavebourn

Thanks! I would see it as soon as starts smocking!

It started wearing a dress?

Wavebourn · 4th May 2009, 11:25 PM

Quote:

Originally posted by Mr Evil

It started wearing a dress?

I have no clue. I saw it already in the hole in the chair after Diana Krall stopped singing abruptly.

kees52 · 5th May 2009, 02:12 PM

Hi all

here a changed one, lets see wat I have did wrong this time haha.

The new css more potential..

kees52 · 5th May 2009, 02:12 PM

here the specs

now it is simulation need some corrections when build.

the new ccs has be calculated and will be oke, or minor correction.

I have also a hybride these works and play in my room.

CBS240 · 5th May 2009, 10:15 PM

Clearly a victim of "simulated brainwashing" wrt the power device input stage and the attempted mosfet Wilson mirror.

4th May 2009, 09:58 PM	#2
Mr Evil diyAudio Member Join Date: Aug 2004 Location: Behind you	One problem stands out to me: You've use MOSFETs to make a current mirror (Q2/6/8), which doesn't really work very well because they have quite variable Vgs, which means the output current strongly depends on the particular devices used. If you want that to work, you will have to match the FETs, and you will also need some degeneration resistors. Furthermore, the output current will vary with the supply voltage because the current is set only by the voltage across R4. You can improve that by connecting a capacitor across Q2 drain to the supply. __________________ https://mrevil.asvachin.eu/

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5th May 2009, 10:15 PM	#10
CBS240 diyAudio Member Join Date: Aug 2005 Location: K-town	Clearly a victim of "simulated brainwashing" wrt the power device input stage and the attempted mosfet Wilson mirror.

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