Can you suggest a schematic were i can use this FET into the output?

[destroyer X]

I have many of them.... looks huge ones.

Please, post the schematic that will work fine with those ones.

Here is the Data sheet.

regards,

Carlos

[destroyer X]

I have many... would like to use them into output, having transistors into the other stages.

Yes, quasi complementary may fit my needs.

I can try to create the circuit...but why to take those risks when we have, in our forum, hundreds of skilled folks to operate with Fets (I am not skilled with them).... so.... already tested schematic will be excelent.

regards,

Carlos

[destroyer X]

But this is not the entire knowledge about Fets.... skilled guys have things to say, advises to give.

It is different when guys are skilled.... i am new into Fet.

All i know they have gate, drain and source and works sligtlhy different..have capacitance into the input.... charge and do not conduct input current..no DC current..only AC current into the input... strange folks...and we need bigger bias voltage to force them to operate.... very strange folks those Fets!

Negative!..please, not those fanatics by fets with amplifiers using fet everywhere...no!..no! ...no!.... only the output friends, please!

regards,

Carlos

[KSTR]

Hi Carlos,

maybe something like this, preferably a class-A variant and in bridge mode (because of the low Vds)?
Improving the linearity of an N-ch MOSFET output stage

This MOSFET has really a lot of capacitance and needs a hard drive... and maybe it is quite non-linear at reasonable currents (note that the curves start in the 10A region) -- there are chances it will not be good for audio. But one would certainly need to try it, so go ahead...

I once used a somewhat similar monster, the IRFP2907, in a power supply (as a cap multiplier), where it perfomed well. No audio application, though.

Regards, Klaus

[wg_ski]

As a class H rail switch

I just ordered a bunch of Fairchild's version (HUF75344G3) for that purpose. The IR's in the TO247 have just gotten stupid expensive the last few years - good find!

[x-pro]

Hi Carlos,

my O/S configuration would work well with these devices. You can build a single 50V supply bridge amp, capable of 100W into 8 Ohm, 200W into 4 and happily delivering 400W into 2 Ohm load. If you only need it for a subwoofer, than it can be quite simple as you don't need a lot of speed. However it is also possible to build a good full-range amp with these devices. A simplified circuit I've simulated using somewhat similar size FETs (IRF1405) for the output, set for 600mA idle (15W dissipation on each transistor) shows about 0.07% THD at 1 kHz, 40V p-p into 4 Ohm and 0.1% into 2 Ohm.

Cheers

Alex

[destroyer X]

In the reality i am searching for something using BGTs...only the output stage using FETs.

Thank you.... very precious informs.... very good ones.

Now i have more knowledge about.

regards,

Carlos

[taj]

I don't know anything about its suitability to your FETs, Carlos, but this one suits your request for all-BJT front-end and has Quasi-complementary FET outputs. And is VERY well respected for its sound.

http://www.adam.com.au/cgpap/QuasiWeb/index.htm

..Todd

[destroyer X]

and an excelent designer.

I would like to produce some different schematic...you know.... we love new things, different ideas, sligthly different schematics, to listen, to evaluate, to understand more, to learn more.

New ones are more pleasant than build, once again, some of Quasi amplifiers.... i made many amplifier from Quasi

I will build this one RAJ have just sent me.

regards,

Carlos

[destroyer X]

The basic idea is almost the same... number of stages the same... bias is different..there are small differences only.

But a little different one.

regards,

Carlos