Is this FET good to use into audio amplifiers?

destroyer X · 12th February 2009, 09:57 AM

If no good, why?

Please, inform the complementary, i have many FETs in my home and i do not know if i can match them to work as complementary.

What is the main characteristics i should observe into the datasheet to decide if they can work together? (studing N type and P type).

Is this mismatch related drain to source resistance something important to worry about?... some of them, for instance, having 0,47 ohms and others having even lower...or higher resistance.

Because of Dudainc kindness and also Anonimous kindness, now a days i have hundreds of power FETs in my home... also BGT power units and drivers.

Thank you,

regards,

Carlos

destroyer X · 12th February 2009, 10:02 AM

I have many units... would be very interesting.

regards,

Carlos

syn08 · 12th February 2009, 10:44 AM

These are decent vertical power mosfets. Although originally intended for switching, they will do a fair job in audio amps. The closest equivalents I can think of are IRF240/IRF9240

Nrik · 12th February 2009, 11:22 AM

Carlos
I cannot imagine that I am gonna say this to YOU, but......Try it!

Feedback should take care of whatever non-linearities there might be. Try them in maybe in these:
http://www.adam.com.au/cgpap/QuasiWeb/index.htm

...and tell us about it.

Henrik

Nrik · 12th February 2009, 11:26 AM

Grollins uses exactly this one and its P-channel in his 25W class A amp here:
The GR-25

...even without feedback! So these must be very good for audio.

sajti · 12th February 2009, 11:28 AM

Can be useful in any N channel MOSFET amplifier.

Sajti

Ps.: Did You clean up the Fairchild warehouse?????

destroyer X · 12th February 2009, 12:06 PM

Yep.... a good idea is to try....but i would like to learn how to make a good choice of models searching for matched pair.

Thank you folks,

regards,

Carlos

megajocke · 12th February 2009, 01:46 PM

I'd try to find something that has similar slope in the Vgs-Id characteristic (transconductance).

GRollins · 12th February 2009, 09:16 PM

Quote:

Originally posted by destroyer X

Please, inform the complementary...

To the extent that average vertical MOSFETs have complements, try the FQA12P20. Works nicely.

Grey

destroyer X · 13th February 2009, 10:17 AM

and i can try something.

Carlos

12th February 2009, 12:06 PM	#7
destroyer X diyAudio Member Join Date: Feb 2004 Location: Recife - Brasil Northeast	Thank you Henrik, Sinesthesia and Satji Yep.... a good idea is to try....but i would like to learn how to make a good choice of models searching for matched pair. Thank you folks, regards, Carlos

13th February 2009, 10:17 AM	#10
destroyer X diyAudio Member Join Date: Feb 2004 Location: Recife - Brasil Northeast	Thank you....now i have more informations about and i can try something. Carlos

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12th February 2009, 10:44 AM	#3
syn08 Account disabled at member's request Join Date: Aug 2005 Location: Toronto	These are decent vertical power mosfets. Although originally intended for switching, they will do a fair job in audio amps. The closest equivalents I can think of are IRF240/IRF9240

12th February 2009, 11:22 AM	#4
Nrik diyAudio Member Join Date: Feb 2005 Location: Copenhagen	Carlos I cannot imagine that I am gonna say this to YOU, but......Try it! Feedback should take care of whatever non-linearities there might be. Try them in maybe in these: http://www.adam.com.au/cgpap/QuasiWeb/index.htm ...and tell us about it. Henrik

12th February 2009, 11:26 AM	#5
Nrik diyAudio Member Join Date: Feb 2005 Location: Copenhagen	Grollins uses exactly this one and its P-channel in his 25W class A amp here: The GR-25 ...even without feedback! So these must be very good for audio.

12th February 2009, 11:28 AM	#6
sajti diyAudio Member Join Date: Apr 2003 Location: Vác, Hungary	Can be useful in any N channel MOSFET amplifier. Sajti Ps.: Did You clean up the Fairchild warehouse?????

12th February 2009, 01:46 PM	#8
megajocke diyAudio Member Join Date: Jan 2003 Location: Solna	I'd try to find something that has similar slope in the Vgs-Id characteristic (transconductance).

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