| mantisory |
Well, after several months collecting dust on my dresser, the purchase of a adire kit61 two-way inspired me to complete my GC. I am still not quite finished and have to add the volume control, input selector and power switch (as well as the front panel!).
However, I hooked it up last night and wow! not a trace of noise, even when turned up to 10!
A pic: |
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| davidlzimmer |
| Nice job! The burn in process is a very pleasant experience. Enjoy! |
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| Dominick22 |
Nice job,
I will posting pics too. Post your case when you get the panels finished!
Dominick |
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| mantisory |
upon further review, i am having a problem :(
I am using a 300VA transformer and the 30V seems to push it a little hot (right channel starts cutting in and out after some time at higher volumes), so i am going to need to rethink my heat-sinking. I wonder - if i drill some holes in the copper bar if that would give it enough surface area, or should i somehow try to attach a sink...
Byron |
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| jimbo1968 |
I would say fix the copper bar to the bottom plate with thermal paste as the easiest way to increase your heatsinking.
It may be enough. |
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| mantisory |
ha! For some reason i never thought of that! Thanks...that's a great idea.
Byron |
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| mantisory |
oh oh...now i have a more serious problem.
I took the copper bar off of the standoffs and attached it directly to the chassis, but now i am getting a strange noise from one of the channels (and the other is not doing anything) when i power up the amp and connect my preamp...
it's like a long "zip" tone, and then it starts going "zip, zip, zip" - zip is my best approximation of the noise it makes (the actual chip makes this noise...it is reflected in the speaker as well if they are connected)
any ideas? from the instructions on the chipamp site it looked as if the chassis ground could be used for both the mains ground as well as the amp. board ground, but other places in this forum say that this is not the case...does it seems as though i have a ground loop problem? or something else? Should i not attach the bar with screws?
Any help would be appreciated!
thanks,
Byron |
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| mantisory |
anyone have any suggestions or ideas?
Byron |
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| Dick West |
| Do you have insulators between the chip amp and the copper plate? Or, do your chips have built in insulation? |
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| mantisory |
the chips are the LM3886 from national - i believe they are insulated...
Byron |
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| SpittinLLama |
From the picture they appear to be the insulated ones, 'TF' package code. Unless you had some potential on that copper bar before you moved it to the case there shouldn't be any change. With the chips isolated it makes absolutely no difference to them. You might have to double check all connections and be sure nothing moved or a connection was broken some where. Since they are isolated packages it seems like a weird problem.
-SL |
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