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Old 23rd August 2002, 10:17 PM   #1
Cobra2 is offline Cobra2  Norway
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Default N-channel amp.

Hello!

I'm in the middle of a N-channel project (4 x), (Aussieamps)
-and need to source the degenerative resistors (0R33-5W).

Can anybody please suggest the quality for these,
soundvise, and the source (link please).

Should I use metal-film / wire-wound / in alu-housing / ???
Would the different resistor-types have a "sonic signature"?

Arne K
Norway
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Old 24th August 2002, 11:01 AM   #2
Cobra2 is offline Cobra2  Norway
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Question More Q...

I have searched thru all forums, and printed most about this amp,
And it only leaves me more confused.
I have tried to e-mail Mr. Holton, but some mail buonces,
and I have not managed to get a reply. (Holiday/Travel???).

----------------------------------------------
Quote from e-mail:

Hello!

I have been assembling the N-channel boards,
and I have a few questions:
(Comparing w. shematics, March-2001)

On the PCB: (dated Jan2001), I cannot find marking/holes
for more than 2 x Zener-diodes.

And marking/holes for C5-470pF is missing.

- marking/holes for C1 and E1 (470nF/470uF) is missing.

- marking/holes for E6 (10uF) is missing.

A 47uF is indicated on PCB but not on Bill of Material, which also has other errors...?

Please tell me where these (on PCB) missing components are supposed to be
mounted, (a drawing/picture would be great), and if there are other errors I should be aware of.

I would also like to see a picture of the PCB with reference to component no. instead of value, as I find it much easier to find the part compared to schematics.

Regards

Arne Karlsen
NORWAY
------------------------------------------------
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Old 24th August 2002, 03:26 PM   #3
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Arne,
IME multiple parallel film resistors can sound nicer than single ceramic wirewounds.
Multiple 1W carbon emitter resistors gave a nice result to my ear.

Eric.
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Old 24th August 2002, 04:59 PM   #4
jleaman is offline jleaman  Belgium
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i bought mine from www.digikey.ca and i oo have built this amp..

still wating for the resisters should have them wendsday then the ossilating will be gone WOOO HOOOO

j"
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Old 24th August 2002, 05:17 PM   #5
jleaman is offline jleaman  Belgium
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yeah..!
Attached Images
File Type: jpg epsn0021.jpg (82.2 KB, 4049 views)
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Old 25th August 2002, 11:19 AM   #6
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If you use wirewounds, make sure they are the non-inductive type. Some of those metal clad ones come in both types, i.e. you can specify which one you want. Some amplifiers will oscillate if the source resistor is inductive, the resistance wire inside them is wound up like a coil.

GP.
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Old 2nd September 2002, 10:12 AM   #7
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Have you tried searching on this Forum. I have posted quite a bit about this amplifier. I have working modules. I used 3 x 1 Ohm 1 watt resistors for the output stage. This amp simply does NOT oscillate. Perhaps, it is because I used my own PCB design. I repeat, search the Forum.

Previously I had posted a photograph of a fully populated board.

The sound quality of this amp is excellent. I am investigating placing a buffer stage before the driver mosfet for even better resolution.
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Old 2nd September 2002, 10:22 PM   #8
Cobra2 is offline Cobra2  Norway
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Default I think it's sorted now...

Hi, all...thanx

I did get an answer from Mr. Holton, and I think I'll manage to
sort it out.

Yes, I have read a lot of old treads, and some of the same issues
was mentioned, but not fully explained.


I really want this amplifier to be GREAT, and will spend money
(whitin reason) on those parts that have most sonical influence.
And I'm building it as a balanced amp. with 4 boards for 2 channels.

Arne K
NORWAY
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Old 2nd September 2002, 10:27 PM   #9
jleaman is offline jleaman  Belgium
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MIne will be done in a few days just wating for my .33 ohm resisters to be here i need them for teh ossilating problem that i was haveing.. ill post pics in a few days as it will be driveing my 15" sub : O )
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Old 3rd September 2002, 01:18 AM   #10
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Hi All

Whether you use metal film, wire wound or Carbon film, makes no difference to the objective performance of the n-channel amplifier.
It will not oscillate.
However Carbon film or Metal film if available could help the subjective performance.

Nice to see they is quite a few working n-channels out there.
I for one use mine everyday. I love the sound of Asymmetrical o/p stages.

If you have any questions, you can get me via this forum.

Cheers

Anthony Holton
Aussieamplifiers
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