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Old 25th February 2013, 07:29 AM   #3161
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I took a multistranded cable and ran it from the input ground on the bottom of the board to the back of the enclosure and just like sofaspud removed some of the paint around a screw hole. The cable strands are pinned between the back plate and the chassie.
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Old 25th February 2013, 09:53 AM   #3162
swalter is offline swalter  Switzerland
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there is a picture on NwAvGuy's blog for sure showing how the board is grounded to the case. There it is grounded at the front. I would run the ground wire to the back if a clear panel is used in the front, just for the looks If grounded to the front one of the 1/8W resistor legs will do fine.
I use a Dremel to grind off a bit of the material around the screw hole so the panel sits flush afterwards.

I have to build a couple of amps tonight and will take a pic or two and post them here.

Stefan
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Old 25th February 2013, 04:21 PM   #3163
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Quote:
Originally Posted by swalter View Post
there is a picture on NwAvGuy's blog for sure showing how the board is grounded to the case. There it is grounded at the front. I would run the ground wire to the back if a clear panel is used in the front, just for the looks If grounded to the front one of the 1/8W resistor legs will do fine.
I use a Dremel to grind off a bit of the material around the screw hole so the panel sits flush afterwards.

I have to build a couple of amps tonight and will take a pic or two and post them here.

Stefan
Hello Stefan, when do you get EU powersupplies back in stock?
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Old 25th February 2013, 04:33 PM   #3164
swalter is offline swalter  Switzerland
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Originally Posted by Rullknufs View Post
Hello Stefan, when do you get EU powersupplies back in stock?
My supplier will ship tomorrow, so with a bit of luck they will be back in stock Friday.

Stefan
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Old 25th February 2013, 08:20 PM   #3165
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Hi,

I just finished assembling the O2 amp kit I got from Stefan.
I completed the testing procedure as suggested by NwAvGuy and it is Ok with a tollerance of 0.2 VDC of my cheap DMM.
I connected the amp to an old Ipod headphone and... I got music from the right channel but only silence from the left one.

I also went through the troubleshooting section and again my amp seems OK.
So now I am going to follow the final NwAvGuy's suggestion: ask to DIYaudio!

I had a look to this thread, but there are so many posts and it is hard to find the right answer to my problem. I think you understood that I am not a real expert. I suspect a stupid problem with my input or output jacks. Any suggestion?

Thank you for your help

northernsky
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Old 25th February 2013, 10:55 PM   #3166
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Hi,

problem solved: just one of the pot connection poorly soldered.

I'll wait tomorrow to connect my HD600


northernsky
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Old 26th February 2013, 05:50 AM   #3167
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Quote:
Originally Posted by northernsky View Post
I'll wait tomorrow to connect my HD600
Better wait for day after tomorrow to connect those HD600
Chk/ re-flow all the contacts for dry joints.Let the O2 run for couple of hours with music playing with cheapo h/p connected all the time. If using batteries observe the function of PM & look out for power ON/OFF hysteresis cycle & thumps.
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Old 26th February 2013, 08:07 AM   #3168
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Originally Posted by availlyrics View Post
Better wait for day after tomorrow to connect those HD600
Chk/ re-flow all the contacts for dry joints.Let the O2 run for couple of hours with music playing with cheapo h/p connected all the time. If using batteries observe the function of PM & look out for power ON/OFF hysteresis cycle & thumps.
You are right! I already made a mistake.
Thanks again to this forum: with your help, following my gainclones, I have another box working

northernsky
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Old 26th February 2013, 01:45 PM   #3169
swalter is offline swalter  Switzerland
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Default grounding PCB to case How To...

As promised, some pictures taken last night, was a bit late already and had to get up early so posting them only today. Description in order to the pics attached

1 - solder a left over lead from one of the 1/8W resistors to the ground pin of the input jack
2 - scrap of the anodized material - or better use a dremel - around the lower right front screw hole
3 - bend the wire around the hole
4 - step 3 works best like this

now screw your front panel on and you are good to go.

Stefan
Attached Images
File Type: jpg ground_1.jpg (56.0 KB, 256 views)
File Type: jpg ground_2.jpg (42.9 KB, 251 views)
File Type: jpg ground_3.jpg (236.3 KB, 252 views)
File Type: jpg ground_4.jpg (243.5 KB, 250 views)
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Old 26th February 2013, 03:10 PM   #3170
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Those pictures are wonderful. Thanks for the help Stefan!
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