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Old 9th June 2009, 05:45 AM   #1
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Default amp reverse..

engineering

i have a commercial amp which requires reverse engineering.

I do not have a schematic and I dare say it would not be possible to obtain either. But I replaced a resistor and made a few modifictaions and now it si no longer working. However I do not think there is a major problem.

Whats the best way to obtain help to fix this?
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Old 9th June 2009, 05:55 AM   #2
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Pray?
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Old 9th June 2009, 06:04 AM   #3
amc184 is offline amc184  New Zealand
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I'd reverse the modifications and never touch it again. I never, ever try to modify something unless I understand how it works and I have the schematic.

edit: you could name the amp on the off chance a member is familiar with it and can help.
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Old 9th June 2009, 02:33 PM   #4
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Default Can you, please, let us know what is that misterious amplifier brand?


I can almost imagine..... tell the brand for us...maybe we can help you.

Carlos

.................................................. ..................

I remember, and very well, that you have/had, an Aksa.... i hope that one is not your problem, as honored people, alike you i believe, use to promisse not to show board's detailed pictures, not to let curious people to inspect board back side, not to allow copies/reproduction of the instructions you may have, keeping the
circuit distant from curious people... not to let others borrow the equipment or open the case for inspection (only eye inspection, never to take close up pictures)

Thousands have the same Aksa you have/had, and no one did that...of course, i hope, the amplifier you have to reverse engineering is not the Aksa, as this is not allowable by the Aksa responsable, beeing a criminal behavior, i am sure, you will not even think about.

Reverse enginneering of an Aksa model, is not allowable to happen into a public openned forum...of course you can do it by yourself, inside your home, to the enjoyment of your lucky eyes, that had the chance to purchase an Aksa amplifier.

You have called me by international telephone yesterday night, and i had the chance to explain you a lot of things about Aksa, i hope those above informations are also within your knowledge limits.

I would like to inform i am not Aksa, nor a representative, nor a partner and i have never sold an Aksa amplifier...i am just an Aksa owner, a happy owner, someone that loves and respects the brand and audio quality of that topologie and subcircuits used to increase performance.... Hugh Dean, from Melbourne is the owner and responsable... a lovely super skilled man that honored me with his friendship.

In advance, i am sorry by this long message, useless i think, because an honored man would never, even think, to do such a kind of thing...but this serves, to the ones does not know, that exists a "gentleman agreement" about the maintenance of those secrets out from the "non customer" knowledge.


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Old 9th June 2009, 02:36 PM   #5
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Default that is the truth

tge forum is full of very helpfull experts ....just sate your brand a model and sooner or later you will get the best of help !!!

regards sakis
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Old 9th June 2009, 02:56 PM   #6
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Default Hello dear Sakis... is the family fine?


I hope Maria is fine.... we are waiting the great day.

Keep me informed by direct mail.

Uncle will be happy to receive the happy news from you, in special, in advance related others.

regards,

Carlos
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Old 9th June 2009, 03:12 PM   #7
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Default will do uncle Charly

you will be the first to know ....just a few days now left ....

happy regards !!!
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Old 9th June 2009, 06:00 PM   #8
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Hi,

This is nothing to do with Aksa.

The amplifier is made by Myryad and model is z140.

They have been taken over now so its impossible to obtain schematics.

The other problem is I dont remember exactly which resistor I changed.

It's a class AB amp about 60 watts/channel.
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Old 9th June 2009, 06:13 PM   #9
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Default This is a very good news...i was suspecting about Aksa


i am very happy to be wrong.... those moments man..it is lovely to be wrong!!!

I would like to help...or to try, as i am not very good doing such things.

But i have needs.

A high resolution picture, very well focused (use a tripod)... image taken alike airplane flying over the board...aerial view..upper view.... using high resolution camera (more than 5 Megapixels (not a cell phone camera)..using macro function and with the flash disabled.

Crispy focus is needed.. the image must fill entirelly the frame field..the whole board, if possible, or squared parts with numerical sequence information (magazine reading sequence).... no flash..natural ligth and angle choice must avoid ligth reflections alike strong ligth spots from the sun reflecting into the board surface.

Also a picture in transparency..this is problematic, as you have to put it against the sun to produce the image...and sometimes to remove the board from the enclosure (another problem).

Another picture is the copper lines... the down pcboard, under board copper lines..and this may be produced and latter mirrored (I have not that function here)....

With those three images, if well made, we can try , but this is not guaranteed.

As you told you have a Compulsive obsessive personality, i really think this is something perfect to you as an exercise..as you will never give up till you finish to produce this back enginneering.... i really think you have all the needed skills to do that..good eyes and the will to be insisting.... never giving up, about something you want.

I have blocked you into the forum professor, also blocked you entrance into my E mail... even this way you have found my telefphone number and gave me a call..this seems you never give up and is obsessive alike you told.

Be happy.

regards,

Carlos
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Old 9th June 2009, 09:14 PM   #10
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Is it a current feedback amp with a triple as outputstage?? I have a schematic of a myrayad, dont know what model, bulit a clone, pretty good amp.
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