AEM6000 mosfet amplifier
Daryl Tewksbury
mosfet amplifier, I assume it was published by Australian Electronics
Monthly. I have built one of these, and it has been great but I lost the
circuit in a move years ago. I am having trouble with a 5000 series amp
that is oscillating a lot, great if you want to use it as a transmitter,
not much good for audio though.I though that a comparison of the circuits
might give me some Idea for stabilizing it.Any info would be good.
Paul Cambie
Daryl Tewksbury <dtewk...@ninenet.com.au> wrote in article
<01beace2$3d97d6a0$617f6ccb@mitsu>...
> Does anyone know where I could get a circuit diagram for the 6000 series
> mosfet amplifier, I assume it was published by Australian Electronics
> Monthly. I have built one of these, and it has been great but I lost the
> circuit in a move years ago.
I have a copy of article "AEM Project 6005, A 100 Watt 'Ultra-Fidelity'
Topology MOSFET Amp Module", by David Tilbrook, April 1987. It refers to
David Tilbrook's earlier AEM6000 which I don't have the article for
unfortunately, and to his earlier "Series 5000" which I presume is "Series
5000 MOSFET Stereo Amp", David Tilbrook, ETI March 1981, based on ETI-477
power amp modules from Jan and Feb. 1981.
I too would be interested in a copy of the "AEM6000" article, but if the
"AEM6005" is the one you're refering to I'm happy to fax or mail you a copy
- let me know where to send it by private email.
I am having trouble with a 5000 series amp
> that is oscillating a lot, great if you want to use it as a transmitter,
> not much good for audio though.I though that a comparison of the circuits
> might give me some Idea for stabilizing it.
There was a note re stabilty problems for the ETI-477 ("Series 5000") in
ETI August 1981, p.11 - are you aware of this? One of the subjects it
covers is the brand/type of source resistors - in BJT amp modules (which
I'm much more familiar with than MOSFET's) - poor 5W concrete resistors (=
inductive I assume) has made several of my constructions "sing" madly; I
use IRH types religeously now, 'tho I believe the "Noble" brand the note
refers to are OK too.
The other issue the note refers to is the quality of the capacitor in the
RC stabilty network at the amp's output (C9 - R29 are the circuit ref's).
This is a new one on me, but the note refers to the adverse effects of use
of poor quality greencaps in this position. I can't say I would normally
trust any greencap in this position anyway, so hopefully that's why I've
never run into this problem!!!!
I'd be happy to discuss/work with you to overcome the stability problems
you refer to; let me know some more details? (I could overcome my
irrational and technically unfounded paranoia about delving into MOSFET amp
construction *myself* in the process!!!!!)
Cheers!
Paul