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Old 2nd March 2012, 06:43 PM   #2161
Fsatsil is offline Fsatsil  United States
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Quick question about the O2 board from JDS Labs. Can anyone tell me if there is enough room to use Dale RN55 for the gain resistors?
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Old 2nd March 2012, 06:50 PM   #2162
swalter is offline swalter  Switzerland
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Originally Posted by Fsatsil View Post
Quick question about the O2 board from JDS Labs. Can anyone tell me if there is enough room to use Dale RN55 for the gain resistors?
Hi, asuming JDS Labs are using the same PCB reference design as everyone else it will be a tight fit, the resistors measure 6.1 mm whilst the hole space is roughly 6.8 - 7 mm. They would fit in vertically though.

Stefan

Last edited by swalter; 2nd March 2012 at 06:53 PM.
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Old 2nd March 2012, 07:01 PM   #2163
Fsatsil is offline Fsatsil  United States
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Thanks I guess I'll know for sure in a few days when my board arrives
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Old 2nd March 2012, 07:04 PM   #2164
Grief is offline Grief  United States
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Quote:
Originally Posted by Jelle Schrijver View Post
@ Grief: There are also the lasercut panels of aerohoff, $6 each + shipping
Thread is over here

Acrylic:
Click the image to open in full size.

Bamboo:
Click the image to open in full size.
Oh wow! I really like the look of those! Tough decision deciding on which one to pick.
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Old 3rd March 2012, 04:35 AM   #2165
Splatem is offline Splatem  New Zealand
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I'm very happy with my O2, it sounds great with my HD 600s. Thanks for all your hard work RocketScientist. I built a custom timber case out of Jarrah, with desktop sized line in and headphone connections.
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Old 3rd March 2012, 05:40 AM   #2166
dtproff is offline dtproff  United States
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My thanks also RS. Outstanding job.

Tony
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Old 3rd March 2012, 07:54 AM   #2167
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Originally Posted by Cpl Clegg View Post
@Grief, I contacted Allelectronics and asked about the unloaded voltage of the catalog# "ACTX-1620" PSU that sofaspud mentioned, since I'm interested in one or two, myself. I'll let you guys know what they say - it may be useful to others.
I'm not sure how responsive AE will be to your inquiry. They already include a "disclaimer" with all of their unregulated power supplies. FWIW, I have a similar 16.5VAC 40VA wall wart handy. It's output measures 18.1 volts on my Fluke 79II. I had been using it for a battery charger, in a half-wave configuration with a 6800uF filter capacitor. There, it measured 19-and-change VDC. So I'm reasonably confident the ACTX-1620 will work for the O2. The regs will have to dissipate the extra power, but you'll have to push the limits for things to get really hot.
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Old 3rd March 2012, 08:15 AM   #2168
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Quote:
Originally Posted by Grief View Post
Oh wow! I really like the look of those! Tough decision deciding on which one to pick.
That's why I took both :-)
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Old 3rd March 2012, 03:40 PM   #2169
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Originally Posted by sofaspud View Post
I'm not sure how responsive AE will be to your inquiry...
Your thoughts echo mine and I considered calling for that reason. It's not quite as easy to dismiss people over the phone. I may wind up ordering it regardless, since I see a couple additions to their catalog that I "need" (as usual). In which case I'll measure it myself and report back.

Can't say I won't be annoyed if it's pumping out 22VAC or something without load, though.

Edit: Did you see those silicone mats in the rubber feet/bumpers section? Those would make some nice heat resistant non-slip/stick surfaces. This happens every time I look through their website.

Last edited by Cpl Clegg; 3rd March 2012 at 03:53 PM.
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Old 3rd March 2012, 07:18 PM   #2170
T2T is offline T2T  United States
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Hey, nice pictures of the custom cases and the bamboo front panels, too. It's very interesting how this O2 revolution is taking on different directions from an aesthetics standpoint. Lots of great custom work going on out there.

On another note, I realize there are some limitations in this thread from a support stand-point, but possibly, I could just word things in a venting sort of way.

3 months or so back, I bought an O2 pre-assembled from an individual who was building the amps and supplying the Triad power supplies and the good rechargeable batteries, too. I'm now having troubles. First, it was my Triad supply that died a bit over a month ago. So, I found a replacement AC power supply. Now, I'm realizing other issues happening, which is likely related to the issue that may have killed off my first Triad supply in the first place. I noticed my aluminum case was quite warm and my headphones were distorting a bit at times. Believe me, this was sadness for me - because I liked the amp so much. Additionally, I experienced some "sparking" issues when my metal iPod would come in contact with the case.

So, I did some investigating and took the board out of the case. I realized that the PCB was not grounded with a grounding wire to the case (based on advisement from a member on another board). I also realized that the source of the excess heat seemed to be two regulators. Smelling them, revealed some excess heat had been applied to them causing potential break-down. I quick view at the bottom of the PCB also revealed some darkening of the 6 solder tabs where the two regulators were soldered. Finally, additional research located 4 resistors (behind the input jack) which had their metal ends poorly trimmed after the solder work. However, those 4 ends would -- and could apparently come in contact with my aluminum housing from time-to-time causing who knows what kind of issues.

I realize this is a great amp, the prices on them are excellent. I can easily have a new board built and a new power supply shipped my way for a bit over $90.00 and I'd just use the existing case. However, on the other hand, I think I should contact the builder / seller of this amp due to the issues I've experienced and explain the issues. Some compensation towards resolving this issue or even supplying me with a new completed board and power supply would seem logical. Then again, I guess that might just be me who wants to ensure that people who purchase items from me are content, happy and would easily buy from me in the future, too.
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