30W mosfet Planteféve

[GEirin]

HI

Recently I found an old article of a power amplifier, 2x30W AB Mos Fet of J.M. Plantefeve.
Has anyone heard of this?

GEirin

[GEirin]

Schematic

[Tube_Dude]

Without a trimmer pot for adjustment , the output mosfets bias , will be no predictable , I'm afraid.

Also expect some DC offset ...

[GEirin]

Ok.
R82 and R83 are trimmer pot for adjustament.
GEirin.

[lineup]

Originally posted by GEirin
Recently I found an old article of a power amplifier, 2x30W AB Mos Fet of J.M. Plantefeve.
Has anyone heard of this?

I know the website of Plantefeve from France.
There are some interesting amplifiers over there!
Very minimalistic Power Amplifiers.


I do not know the details of this MOSFET you are asking about.
It uses 2SK1058 / 2SJ152 lateral MOSFETs.

Bias is set only with resistors.
This means you should have very large heatsinks to avoid problems with bias runaway.

Here is a link to original article, with a picture of this amplifier & schematic:
MOS-FET 2 x 30 W

Plantefeve Hompage:
Plantefeve ENGLISH version

[darkfenriz]

Originally posted by GEirin
Ok.
R82 and R83 are trimmer pot for adjustament.
GEirin.

That's OK.
You can adjust both offset and bias with them.
Another thing: it has very high gain, are r74 anf r79 correct?
By contrast open loop gain is low, therefore low feedback.
You will have to bias mosfets heavily for low distortion and low output impedance.

regards

[GEirin]

Thanks for yours replys.

J.M. Plantefeve décrit dans la nouvelle revue du son N° 217 de Mars 1998.

Website is www.selectronic.fr

Kit amp mosfet 2x30W NRDS.
Has anyone heard this amplifier?

GEirin