Please comment on this amplifier

Marito · 27th September 2006, 05:44 AM

Please take a look at this schematic that i found at http://users.swing.be/edwinpaij/ampli_mosfet_simple.htm and tell me your opinion(or anyone in this forum),if it can be work well, at least it seems to be a decent circuit, with more controls to adjust it (I don´t want to explode mosfet´s because are more expensive that the BJT´s).
Even in this page there is an upgrade version of this amp with some components but that.
Also if somebody build it that write a comment
Thanks to all

AndrewT · 27th September 2006, 07:01 AM

Hi Marito,
your in the wrong thread.
Try starting your own enquiry.

rlg_200 · 27th September 2006, 07:20 AM

marito,

you say mosfet is expensive, but according to ur schematic it is also a mosfet amp, I am familliar with that circuit, but I did not build that so far. it is uses a mosfet power of IRFP240 N TYPE, AND IRFP9240 P TYPE

u can visit aussieamplifiers it uses almost same topology.

rlg

anatech · 27th September 2006, 05:49 PM

Hi rlg_200,
Good points.

Caps and more punctuation would make your posts easier to read.

Hi Andrew,

Quote:

Hi Marito,
your in the wrong thread.
Try starting your own enquiry.

Agreed. This one is too long already.

-Chris

Edit: Marito, you have your own thread now!

MikeB · 27th September 2006, 06:29 PM

My first thought seeing the schematic: Oh no, not again an amplifier using IRFs without thermal compensation... DON'T !!!

Mike

ilimzn · 27th September 2006, 06:37 PM

Quote:

Originally posted by rlg_200 marito,
you say mosfet is expensive, but according to ur schematic it is also a mosfet amp, I am familliar with that circuit, but I did not build that so far. it is uses a mosfet power of IRFP240 N TYPE, AND IRFP9240 P TYPE

NO it certainly does not!!!
Anyone using IRFP parts in this configuration will get exactly what they deserve, and that is smoking IRF parts. This schematic is intended for lateral MOSFETs ONLY and is in fact an almost verbatim reproduction of an application note for Hitachi lateral MOSFETs. I am currently aware of only 3 manufacturers of lateral MOS, two being original (Hitachi and Magnetec) and the third, which name escapes me now, being a second source for obsolete Hitachi parts.

TomWaits · 27th September 2006, 10:25 PM

Quote:

Originally posted by ilimzn
[B]

...an almost verbatim reproduction of an application note for Hitachi lateral MOSFETs....

Can you point us to this document?

Thanks,

Shawn.

Leolabs · 28th September 2006, 01:23 AM

This circuit was originally intended for Hitachi's lateral FET,the old 2SK135/2SJ50.

jaycee · 28th September 2006, 02:25 PM

Quote:

Originally posted by ilimzn
I am currently aware of only 3 manufacturers of lateral MOS, two being original (Hitachi and Magnetec) and the third, which name escapes me now, being a second source for obsolete Hitachi parts.

Exicon?

AndrewT · 28th September 2006, 03:40 PM

Renesas

Types include
2sj160/1/2 & 2sk1056/7/8
2sj81/2/3 & 2sk225/6/7
2sj48/9/50 & 2sk133/4/5

27th September 2006, 07:01 AM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi Marito, your in the wrong thread. Try starting your own enquiry. __________________ regards Andrew T.

28th September 2006, 03:40 PM	#10
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Renesas Types include 2sj160/1/2 & 2sk1056/7/8 2sj81/2/3 & 2sk225/6/7 2sj48/9/50 & 2sk133/4/5 __________________ regards Andrew T.

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27th September 2006, 07:20 AM	#3
rlg_200 diyAudio Member Join Date: Sep 2006	marito, you say mosfet is expensive, but according to ur schematic it is also a mosfet amp, I am familliar with that circuit, but I did not build that so far. it is uses a mosfet power of IRFP240 N TYPE, AND IRFP9240 P TYPE u can visit aussieamplifiers it uses almost same topology. rlg

27th September 2006, 06:29 PM	#5
MikeB diyAudio Member Join Date: Apr 2004 Location: Gütersloh	My first thought seeing the schematic: Oh no, not again an amplifier using IRFs without thermal compensation... DON'T !!! Mike

28th September 2006, 01:23 AM	#8
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	This circuit was originally intended for Hitachi's lateral FET,the old 2SK135/2SJ50.

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