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KMG SS Poweramps

Started by THChrist, December 28, 2010, 11:02:15 PM

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KMG


joecool85

WOW!

I'm with Juan, you need to start selling these, that's impressive!!  :tu:

Honestly, I'm not kidding, I'd buy one as I'm sure many others would as well.  Please let me know if you do decide to start selling these as I know of a few places around here that would probably be interested to sell these locally.
Life is what you make it.
Still rockin' the Dean Markley K-20X
thatraymond.com

KMG


bassetrox

Hi KMG, once again, great work,

and thanks for sharing so liberally.

I've been trying to simulate your 5W PA design to help me better understand it, but I can't get more than a couple of millivolts clean signal. Any idea what I'm doing wrong? I haven't got much experience simulating fets with tx.
http://ampworks.co.uk/ <- Not much to see here yet!!

KMG

bassetrox, you can use LTspice simulation files from there
http://milas.spb.ru/~kmg/files/projects/fetpa/mp/sim/

bassetrox

Thanks a lot KMG,
comparing your to mine, I cant see what I was doing wrong :s No worries anyway.

Have you tried any dual rail designs with complimentary pairs of lateral FETs into a tx?


Quote from: KMG on June 20, 2012, 10:28:42 AM
bassetrox, you can use LTspice simulation files from there
http://milas.spb.ru/~kmg/files/projects/fetpa/mp/sim/
http://ampworks.co.uk/ <- Not much to see here yet!!

KMG

QuoteHave you tried any dual rail designs with complimentary pairs of lateral FETs into a tx?
I tried this prototype, but it has zero temperature drift & I finished experiments with it.
http://milas.spb.ru/~kmg/files/projects/fetpa/nt/FetPaNt.pdf
Also you can try to read this article
http://translate.google.com/translate?hl=en&sl=auto&tl=en&u=http%3A%2F%2Fgtlab.net%2Fgtlab4%2Farchives%2F30

KMG

#97
Comparision records (made by my friend) of 6V6 PP PA & 5W fet PA:
http://milas.spb.ru/~kmg/files/projects/fetpa/mp/samples/ModS%20-%206V6PP%20vs%20KMG%20FET%205W.rar
They recorded using MOD_S custom amplifier using its own PA & 5W fet PA connected to "Send" jack.
Frequency response of both PA was equalised using Presence & Depth controls.

Recordings are unnamed (numbered) so you can try to estimate "who is who".

KMG

#98
40W transformer output PA Module.

Partially SMD version.




All through hole version.



Information about both versions  there.

J M Fahey

Wow!! In-cre-di-ble !!!
Congratulations !!!!
It's way too generous of you sharing such advanced work with us   :tu:

PS: as a side note: your actual physical construction is *so* good, that I thought those were not pictures but some CAD design, go figure  :cheesy:

KMG

Quote from: J M Fahey on September 11, 2012, 12:35:00 PM
PS: as a side note: your actual physical construction is *so* good, that I thought those were not pictures but some CAD design, go figure  :cheesy:
You're right, it's rendering from SolidWorks.

J M Fahey

Ouch !!!  :o
You are considered such a good builder, that I thought *in this case* they were "real".
Go figure !!!  8|

KMG

Mini head project - LND150 based JCM800 preamp + 5W PA.



J M Fahey

*Very* cool, congratulations !!! :dbtu: :dbtu:

KMG

I got ordered PCB's for
Micro fet PA with speaker simulator

& mini mixer for it