Another GC is born!

mantisory · 4th July 2006, 12:09 PM

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:

davidlzimmer · 4th July 2006, 04:48 PM

Nice job! The burn in process is a very pleasant experience. Enjoy!

Dominick22 · 4th July 2006, 11:24 PM

Nice job,

I will posting pics too. Post your case when you get the panels finished!

Dominick

mantisory · 5th July 2006, 11:02 AM

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

jimbo1968 · 5th July 2006, 11:16 AM

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.

mantisory · 5th July 2006, 11:31 AM

ha! For some reason i never thought of that! Thanks...that's a great idea.
Byron

mantisory · 6th July 2006, 11:05 AM

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

mantisory · 6th July 2006, 02:14 PM

anyone have any suggestions or ideas?
Byron

Dick West · 6th July 2006, 02:54 PM

Do you have insulators between the chip amp and the copper plate? Or, do your chips have built in insulation?

mantisory · 6th July 2006, 03:04 PM

the chips are the LM3886 from national - i believe they are insulated...
Byron

4th July 2006, 04:48 PM	#2
davidlzimmer diyAudio Member Join Date: Jan 2006 Location: Fairmount, GA	Nice job! The burn in process is a very pleasant experience. Enjoy! __________________ Poor stereo mix? Switch to mono! Perfect.

4th July 2006, 11:24 PM	#3
Dominick22 diyAudio Member Join Date: Aug 2005	Nice job, I will posting pics too. Post your case when you get the panels finished! Dominick __________________ A real amateur enthusiast!

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5th July 2006, 11:02 AM	#4
mantisory diyAudio Member Join Date: May 2002 Location: toronto	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

5th July 2006, 11:16 AM	#5
jimbo1968 diyAudio Member Join Date: Nov 2004 Location: UK, bristol	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.

5th July 2006, 11:31 AM	#6
mantisory diyAudio Member Join Date: May 2002 Location: toronto	ha! For some reason i never thought of that! Thanks...that's a great idea. Byron

6th July 2006, 11:05 AM	#7
mantisory diyAudio Member Join Date: May 2002 Location: toronto	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

6th July 2006, 02:14 PM	#8
mantisory diyAudio Member Join Date: May 2002 Location: toronto	anyone have any suggestions or ideas? Byron

6th July 2006, 02:54 PM	#9
Dick West diyAudio Member Join Date: Aug 2004 Location: Illinois	Do you have insulators between the chip amp and the copper plate? Or, do your chips have built in insulation?

6th July 2006, 03:04 PM	#10
mantisory diyAudio Member Join Date: May 2002 Location: toronto	the chips are the LM3886 from national - i believe they are insulated... Byron

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