My first gainclone...progress report

Rafal · 12th March 2004, 01:53 AM

Hi All,

I thought I'd share with you my progres on the irst Gainclone I'm building.

It is based on the Peter Daniel's design and his advice, which by the way, I am very greatfull for.

Thanks Again Peter !!!.

I decided to make an enclosure out of 6" dia. aluminum tube (.25" wall thickness. The top will house both channels and the bottom a 400VA transformer. The Chips are LM3875. The whole thing will sit on a curly maple base.

I still have to finish the PS and hope to be done this weekend

Here are some pictures:

Feel free to comment.

Cheers,

Rafal

Rafal · 12th March 2004, 01:55 AM

Here is the top view:

Rafal · 12th March 2004, 01:57 AM

Both channels mostly done.

S.C · 12th March 2004, 02:15 AM

Is the bridge in the bottom? Why?

Rafal · 12th March 2004, 03:03 AM

The bridge will be on top on the other side of the aluminum bars (for shielding).

jleaman · 12th March 2004, 04:22 AM

that is a cool idea.. i also have that idea but mine is a bit different. ill draw a picture and post it.. keep up the good work it looks good so far..

S.C · 12th March 2004, 04:59 AM

I think you should relocate the switch, and make it a volume control / light / a round button switch with light instead. It looks odd when there is a rectangle switch on a rounded chassis front.

And you can improve the chassis screw hole by driling a little bigger hole on the outside of the excising hole then sink the screw into the chassis and make it parallel to the surface on the chassis.

Rafal · 15th March 2004, 01:13 AM

Thank you all for your suggestions.

I have finally finished my amp but it has a problem. when I switch it on, it sounds fine, but after acuople of minutes, the sound gets very distorted.

Can anyone suggest why that might be?

Or what other info do you need to narrow down the cause?

Thanks in advance for your help.

Rafal

soundNERD · 15th March 2004, 01:17 AM

maybe its oscillating?

make sure there is no loose connections.

-Mike

promitheus · 15th March 2004, 01:22 AM

It could be a promlem in the wiring or bad grounding. IC amps are very sensitive to ground loops or long wires.

15th March 2004, 01:13 AM	#8
Rafal diyAudio Member Join Date: Nov 2003 Location: London Ontario	problem... Thank you all for your suggestions. I have finally finished my amp but it has a problem. when I switch it on, it sounds fine, but after acuople of minutes, the sound gets very distorted. Can anyone suggest why that might be? Or what other info do you need to narrow down the cause? Thanks in advance for your help. Rafal

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12th March 2004, 02:15 AM	#4
S.C diyAudio Member Join Date: Jun 2003 Location: Milpitas	Is the bridge in the bottom? Why?

12th March 2004, 03:03 AM	#5
Rafal diyAudio Member Join Date: Nov 2003 Location: London Ontario	The bridge will be on top on the other side of the aluminum bars (for shielding).

12th March 2004, 04:22 AM	#6
jleaman Banned Join Date: Apr 2002	that is a cool idea.. i also have that idea but mine is a bit different. ill draw a picture and post it.. keep up the good work it looks good so far..

12th March 2004, 04:59 AM	#7
S.C diyAudio Member Join Date: Jun 2003 Location: Milpitas	I think you should relocate the switch, and make it a volume control / light / a round button switch with light instead. It looks odd when there is a rectangle switch on a rounded chassis front. And you can improve the chassis screw hole by driling a little bigger hole on the outside of the excising hole then sink the screw into the chassis and make it parallel to the surface on the chassis.

15th March 2004, 01:17 AM	#9
soundNERD diyAudio Member Join Date: Sep 2003 Location: Illinois	maybe its oscillating? make sure there is no loose connections. -Mike

15th March 2004, 01:22 AM	#10
promitheus diyAudio Member Join Date: Jan 2001 Location: Germany	It could be a promlem in the wiring or bad grounding. IC amps are very sensitive to ground loops or long wires.

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