and just tested the wall wart aswell that seems to be dead not getting any reading from it at all, is prob why the charging section wasnt given no readings while i was testing to see why it didnt work without the batts
just a wee pic for anyone considering the bamboo faceplate from headnhifi. i sanded it with 600 grit to remove the laser burn from the front. I also sanded a micro bevel on the outer edge to stop splinters from catching. it is finished in hardwax oil for a satin finish. I also counter sunk the screw holes. the torx screws from headnhifi look great. gain switch is missing as i await a replacement. just running on the jumpers from now.
Hey guys, I plan on building my own o2 amp for desktop use. This is my first DIY, and while I do have some practical experience, there are a lot of things that I don't know. I hope that you can assist me in my first attempt 🙂
I'd like to add in a 1/4" input jack as well as some RCA inputs. What steps do I take in order to do this?
Can I exclude soldering the 1/8" jack on the PCB, seeing that I only want to the use a 1/4"? I will be getting a custom-made enclosure, so I that I can add my own volume knob and obviously provide for the additional inputs such as the input jack and RCA input.
Is there anything else I need to add/do? Feel free to advice on anything else. Thanks.
I'd like to add in a 1/4" input jack as well as some RCA inputs. What steps do I take in order to do this?
Can I exclude soldering the 1/8" jack on the PCB, seeing that I only want to the use a 1/4"? I will be getting a custom-made enclosure, so I that I can add my own volume knob and obviously provide for the additional inputs such as the input jack and RCA input.
Is there anything else I need to add/do? Feel free to advice on anything else. Thanks.
Hello dear diyers
I just finished my O2 build today and after initial testing with everything working, i wanted to apply the odac with This guide using method 2. Now, after soldering all the wires, i cant only get Sound from one channel, using the odac and with the cable from the input Jack. I have tested the functionality of the odac and the cables and they both work fine. If i crank the volume high enough I get a faint, distorted Sound on the channel thats not working. Does anybody know what the problem could be? Thanks in advance!
I just finished my O2 build today and after initial testing with everything working, i wanted to apply the odac with This guide using method 2. Now, after soldering all the wires, i cant only get Sound from one channel, using the odac and with the cable from the input Jack. I have tested the functionality of the odac and the cables and they both work fine. If i crank the volume high enough I get a faint, distorted Sound on the channel thats not working. Does anybody know what the problem could be? Thanks in advance!
Try here.
And to guava91011,
You can exclude those jacks you won't be using. Your new inputs and output will connect where those board-mounted jacks are located. Lots of examples in this thread.
Hi, thanks for your reply. I checked the gain switch this morning before going to work and couldn't find any problems with a bridge in the soldering connection (nor could I see where there would be a problem, as there were no other soldering points near the left front leg of the switch). I have also seen that in the post you mentioned, the poster seems to have had a loud static sound. In my case, the only time I hear the static (or anything really) on the right channel is when I turn the volume all the way up, nearly bursting my testing headphones. could there be a problem with U3 / U4?
Hi, sounds like R, L and GND are mixed up, I am not able to open teh guide you linked to, hope it is not the old one I made last year as the cables are mixed up there... :S
Best regards, Stefan
I finished my O2 Friday, did all the testing, listened for hours over Saturday and put it in the case on Sunday. It works beautifully and sounds so clear and neutral. I am listening from ipod to O2 to Amp Camp Amps to PSB Alpha B1s. Wonderful.
Thanks to all you folks on this thread, especially neazleu, agdar, mcandmar and especially sofaspud (love that handle). Your technical advice and encouragement were very helpful. And the best advice was from sofaspud--take your time.
Now onto an Aleph J!
Thanks to all you folks on this thread, especially neazleu, agdar, mcandmar and especially sofaspud (love that handle). Your technical advice and encouragement were very helpful. And the best advice was from sofaspud--take your time.
Now onto an Aleph J!
Hi Stefan, thanks for your reply.
This is the Link:
http://www.jdslabs.com/pdf/Instructions_ODAC_DIY.pdf
Do you have another guide? Maybe I missunderstood the one from JDS.
Cheers
I still need to update the one picture with the mixed up wires in the guide...
It still sounds like your right channel is pulled to ground, are both traces on the PCB cut propperly? You can check this with a DMM using the continuity test from the left and right pin you soldered the wires to to GND.
Stefan
I tried and checked and am pretty sure that the cuts are clean. I've also got the problem when I use the manual, non odac input, only sound on the left side.
Aaaaand I think i've found the problem: I switched the 2 4556AD and ow the other channel is working fine, so i guess that the problem is one of them. ****. Do you have them Spare stefan?
No, I don't unfortunately.
And there may be less than lots of examples, since I couldn't find a one.
You wrote that you will have a custom case. After deciding where you want each of the inputs and outputs located on the front and back panels, you can get help here with getting the jacks connected correctly to the circuit board.
And there may be less than lots of examples, since I couldn't find a one.
You wrote that you will have a custom case. After deciding where you want each of the inputs and outputs located on the front and back panels, you can get help here with getting the jacks connected correctly to the circuit board.
right while waiting for my replacement ac adapter my friend has lent me his so i can find the problem, i have checked all solder points 3 or 4 times no dry or bridged at all, someone said it could be the power section and that was it, no details on what part just the power section, like thats any help to me, what readings and where would be a great help
Google is your friend... (use it)
o2%2520voltages%2520u2%2520only%255B14%255D.png (image)
The whole article including trouble shooting tips, read it:
NwAvGuy: O2 Details
Ok guys, I'm totally at loss now. My new opamps came today, I replaced them but the problem is still there. I don't know what to do now, I'm still not getting any audio on the right channel. I gues I sould have bought a pre assembled one 🙁 Is there anything else you can think of? Thanks!
Have you excluded the gain switch as a possibility?
Reread my post #3462. Your reply above goes on about solder bridges, static, etc. but you haven't confirmed that the switch isn't the problem (at least to my satisfaction). The problem area is the switch support leg on the top side of the PCB. Bend or cut the leg away from the via.