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Old 14th April 2003, 03:57 PM   #1761
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Quote:
Originally posted by Matttcattt
i have checked my wiring and it is correct.
If your wiring is as per your schematic (disregarding the pin numbers), then your wiring is ultimately not correct.

You can't simply swap the + and - pins and make that circuit into a non-inverting version. Not sure exactly off the top of my head what you would ultimately get, but it ain't gonna work right.

If you want a non-inverting version of that circuit, you need to rearrange it like this:

<center>
<img src="http://www.q-audio.com/images/noninverting.jpg">
</center>

se
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Old 14th April 2003, 07:10 PM   #1762
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Quote:
Originally posted by Steve Eddy


If your wiring is as per your schematic (disregarding the pin numbers), then your wiring is ultimately not correct.

my wiring is not as labeled on the schematic, it is using the correct pins, just the same circuit.

Quote:


You can't simply swap the + and - pins and make that circuit into a non-inverting version. Not sure exactly off the top of my head what you would ultimately get, but it ain't gonna work right.

If you want a non-inverting version of that circuit, you need to rearrange it like this:

&lt;center&gt;
&lt;img src=&quot;http://www.q-audio.com/images/noninv....jpg&quot;&gt;
&lt;/center&gt;

se
should i change my gainclone to the circuit you posted, or to an inverting one?
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Old 14th April 2003, 07:26 PM   #1763
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Quote:
Originally posted by Matttcattt
my wiring is not as labeled on the schematic, it is using the correct pins, just the same circuit.
Yes. What I meant was that if you were wiring to that circuit, with the + and - inputs switched around as indicated in your original schematic, then it's not going to work.

Quote:
should i change my gainclone to the circuit you posted, or to an inverting one?
Whichever you prefer. The easiest would be to simply swap the leads to the + and - inputs on the opamp. That will leave you with the inverted circuit.

If you want a non-inverting circuit, then wire it up as per the schematic I gave.

se
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Old 14th April 2003, 09:46 PM   #1764
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Quote:
Originally posted by Steve Eddy


Yes. What I meant was that if you were wiring to that circuit, with the + and - inputs switched around as indicated in your original schematic, then it's not going to work.



Whichever you prefer. The easiest would be to simply swap the leads to the + and - inputs on the opamp. That will leave you with the inverted circuit.

If you want a non-inverting circuit, then wire it up as per the schematic I gave.

se
ill just swap the + and - inputs then. thanks for the help. do you think the chip could be blown? if so, ill order some more.
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Old 14th April 2003, 10:40 PM   #1765
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Quote:
Originally posted by Matttcattt
ill just swap the + and - inputs then. thanks for the help. do you think the chip could be blown?
One way to find out.

If you didn't see or smell any smoke, there's a reasonable chance they're ok.

se
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Old 14th April 2003, 10:44 PM   #1766
Mad_K is offline Mad_K  Norway
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I swapped +/- input on a opa541ap clone the other day, and I got the +Vs on the output; the chip didn't mind
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Old 15th April 2003, 07:05 AM   #1767
Tor M is offline Tor M  Norway
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Hi!
Last week my good old friend Electrocompaniet ECI1 who has been with me for almost 10 years went dead. I hope that it`s a relay thats broken because the amp won`t stop muting on start up, no click. Anyway I haven`t got schematics for it and haven`t got the equipment to start faultfinding. I have very little money for the time beeing, but I`m addicted to music so my choises are:

1 I can send my amp to get it fixed.
2 I can build my self a gainclone for about the same money.

Do you experienced gainclone builders think that a gainclone will be able to drive my Dali Grand Coupe 86db, 6 ohm?

If so is 18 V power supply transformers the way to go?

Have anybody tried the AudioNote tantalum resistors in a gainclone?

I`m sorry if theese questions have been answered before. This treat is so long I`m loosing track of it.

Hope you can help me out, I`m going crazy having to listen to music through my 5 yers old 30$ pc speakers!

Tor M
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Old 15th April 2003, 07:52 AM   #1768
Nuuk is offline Nuuk  United Kingdom
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Hi Tor M,

The concensus of opinion on the Gainclone driving speakers is that it works better with more efficient speakers although one or two people have had success with less efficient models.

As regards the sound quality, IMHO I would say go for it. I have been very impressed with mine and am now seriously considering using the Gainclones to replace my two highly modified Arcam A60's.

The 24 volt transformers that I used produce very good results but remember that I am using 95db/w speakers! 18 volt transformers are considered ideal by other GC builders.

I haven't tried Audionote tantalums.

I agree with you about the length of the thread and a few of us have made suggestions for splitting it into smaller sections. I would love to see a search facility within threads but I don't know how easy that would be to set up.
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Old 15th April 2003, 08:49 AM   #1769
Tor M is offline Tor M  Norway
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Thanks for answering Nuuk..
I really would like to build it. I will get sound out of my speakers even tough it might not be the best mach, og maybe it will work splendid.

Here are my thoughts, it got to be cheap, but not to cheap:

I`ll build a wooden cabinet for it. Shield it with graphite spray. Get a piece of of 0,5-1 cm thick copper, brass or bronze plate for the chips. Space this away from the bottomplate. Oversized powersupply 2X300VA 24V transformers or 2X225VA 18V transformers. MUR 860, BlackGate capasitors, AudioNote or to save some money welwyn rc55 i combination with matched carbon film resistors. Instead of bad speaker terminal I`ll just have 4 pieces of speaker cable with some cable shoes hanging out of it, as speaker connection for a start.
If I can afford it I might try to build this new preamp from Embla Audio in Norway into the cabinet.

http://www.emblaaudio.no/pdf/PREone.pdf

Am I heading in the right direction?

My real concern is the grounding issues. Anybody who can link me to some pages with good information about grounding issues in amps?

I appriciate your help!

Tor M.
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Old 15th April 2003, 09:12 AM   #1770
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Hi!

Quote:
Originally posted by Tor M

My real concern is the grounding issues. Anybody who can link me to some pages with good information about grounding issues in amps?

I appriciate your help!

Tor M.
Try this one for earthing

R. Elliot's article about earthing

And this whole thread for general GC grounding ...

Start grounding is the way to go, and it is easier if you use (like in your plans) a true mono design with two supplies...

One question: Why use a pre-amp? Do you plan to use a turntable? Otherwise I would just use it without it...

Bye,

Arndt
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