particleman14
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A08
MisterX
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That is what it should be.
Since it's an "AND" gate U2U pin 4 should be "high" (3.3 volts) when the USB cable is connected and a jumper is installed across J2U pins 1 and 2.
Since it's an "AND" gate U2U pin 4 should be "high" (3.3 volts) when the USB cable is connected and a jumper is installed across J2U pins 1 and 2.
particleman14
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hmm i seem to be getting 3.2 volts on pin 4. is that within tolerance or bad U2U?
MisterX
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That is fine.
The voltage should "pull down" a little bit on that pin.
What are the chances of having a solder bridge between two of the pins on U1U that is being difficult to spot?
(continuity checks between adjacent pins using the schematic as a reference is the acid test but that is a pain with those little pins)
The voltage should "pull down" a little bit on that pin.
What are the chances of having a solder bridge between two of the pins on U1U that is being difficult to spot?
(continuity checks between adjacent pins using the schematic as a reference is the acid test but that is a pain with those little pins)
particleman14
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indeed. i have been checking those U1 pins all night. from what i and friend can tell there are no bridges. I'm going to get better pics uploaded as my amateur eyes are bound to miss something. will post tmrw.. er later today
amb
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ujamerstand, the voltage regulator's pin 1 and pin 2 are the input and ground pins, respectively. 480 ohms does seem implausibly low But since you have the same measurement on both regulators, it might be something common to both regulators rather than the regulators themselves. When you made these measurements, did the reading stay stable at 480 ohm or did it vary over time? Also, you said that you have the correct voltage at the DAC board's 4.5V test point. Is this still true?
steven2992
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I have just completed a gamma1 and I will be building the gamma 2 tonight but I have a problem with the usb input. When I connect it it's recognized as a usb dac. If I then play music the switch becomes green but after a few seconds the music stops playing and the switch becomes red. I have tried a different computer but it has the same problem. s/pdif works fine with usb power so I think that it might be something with the usb chip. Can anyone help/has anyone experienced this?
m1abrams
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Quote:
When you test it with spdif how is it powered? via usb or via a wallwart
If you use a wallwart with spdif have you tried testing the usb with the wallwart plugged in?
I am wondering if you just have flakey power on the usb from the computer.
Also do you get the same issues if you test it on another computer.
| Originally Posted by steven2992 /img/forum/go_quote.gif I have just completed a gamma1 and I will be building the gamma 2 tonight but I have a problem with the usb input. When I connect it it's recognized as a usb dac. If I then play music the switch becomes green but after a few seconds the music stops playing and the switch becomes red. I have tried a different computer but it has the same problem. s/pdif works fine with usb power so I think that it might be something with the usb chip. Can anyone help/has anyone experienced this? |
When you test it with spdif how is it powered? via usb or via a wallwart
If you use a wallwart with spdif have you tried testing the usb with the wallwart plugged in?
I am wondering if you just have flakey power on the usb from the computer.
Also do you get the same issues if you test it on another computer.
steven2992
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Quote:
usb powered
Quote:
I don't have a wallwart here right now but i could try to find one.
Quote:
I've tried it with two computers, a laptop and a desktop, and both read 5.0xxV on the usb.
| Originally Posted by m1abrams /img/forum/go_quote.gif When you test it with spdif how is it powered? via usb or via a wallwart |
usb powered
Quote:
| Originally Posted by m1abrams /img/forum/go_quote.gif If you use a wallwart with spdif have you tried testing the usb with the wallwart plugged in? |
I don't have a wallwart here right now but i could try to find one.
Quote:
| Originally Posted by m1abrams /img/forum/go_quote.gif I am wondering if you just have flakey power on the usb from the computer. Also do you get the same issues if you test it on another computer. |
I've tried it with two computers, a laptop and a desktop, and both read 5.0xxV on the usb.
K3cT
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Quote:
I had that issue but it happened quite rarely in my case and only when I used USB power and when the Gamma2 board was connected. I solved it by cleaning the boards thoroughly with isopropyl alcohol.
| Originally Posted by steven2992 /img/forum/go_quote.gif I have just completed a gamma1 and I will be building the gamma 2 tonight but I have a problem with the usb input. When I connect it it's recognized as a usb dac. If I then play music the switch becomes green but after a few seconds the music stops playing and the switch becomes red. I have tried a different computer but it has the same problem. s/pdif works fine with usb power so I think that it might be something with the usb chip. Can anyone help/has anyone experienced this? |
I had that issue but it happened quite rarely in my case and only when I used USB power and when the Gamma2 board was connected. I solved it by cleaning the boards thoroughly with isopropyl alcohol.
ujamerstand
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Quote:
The low resistance reading disappeared overnight. It is now over 1M ohm at both U1D and U6D. It was probably because of a short created after I cleaned the board with some alcohol. Thank god I did not plug it in for testing after that. The voltage readings at 4.75V point is a constant 4.74V as of now. The voltage drop on the 3.3V point stabilizes at around 2.93V. Neither chips gets hot during operation.
| Originally Posted by amb /img/forum/go_quote.gif ujamerstand, the voltage regulator's pin 1 and pin 2 are the input and ground pins, respectively. 480 ohms does seem implausibly low But since you have the same measurement on both regulators, it might be something common to both regulators rather than the regulators themselves. When you made these measurements, did the reading stay stable at 480 ohm or did it vary over time? Also, you said that you have the correct voltage at the DAC board's 4.5V test point. Is this still true? |
The low resistance reading disappeared overnight. It is now over 1M ohm at both U1D and U6D. It was probably because of a short created after I cleaned the board with some alcohol. Thank god I did not plug it in for testing after that. The voltage readings at 4.75V point is a constant 4.74V as of now. The voltage drop on the 3.3V point stabilizes at around 2.93V. Neither chips gets hot during operation.
steven2992
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Mine now works and it's great. Turns out it just needed some cleaning. thanks for your help.
particleman14
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well this is about the best pic i could get w/ my crappy camera.
Image upload, up to 2 Mb - Free image upload and image hosting - image upload @ filetac.com
i'm going to borrow another camera to try and get some better pics..
Image upload, up to 2 Mb - Free image upload and image hosting - image upload @ filetac.com
i'm going to borrow another camera to try and get some better pics..
jarpatus
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Dude, what camera do you have? By improving photographing conditions many c****y camera can take decent photos. Can you manually set values like ISO, aperture and exposure?
It seems your environment is dark and you need to use external light/flash - try to use sunlight which is superior or helluvalots of external powerful lights. If you can manually set values, set ISO to minimum and exposure time something like 1/30. No flash. Set aperture size to maximum. Use tripod if you have one if not, grab camera with good tight grip and try to support your arms somehow (1/30 exposure time is too long for steady pictures if you cannot hold camera still somehow). Do not zoom, take distance where your camera still can focus and take many pictures and see if any is good.
Ok ok, I am no photographer but after I learned few basics, my pictures improved A LOT. Real photographers please correct me if I am wrong. Of course this assumes you have at least decent camera, if camera is total c**p nothing can help.
| Originally Posted by particleman14 /img/forum/go_quote.gif i'm going to borrow another camera to try and get some better pics.. |
Dude, what camera do you have? By improving photographing conditions many c****y camera can take decent photos. Can you manually set values like ISO, aperture and exposure?
It seems your environment is dark and you need to use external light/flash - try to use sunlight which is superior or helluvalots of external powerful lights. If you can manually set values, set ISO to minimum and exposure time something like 1/30. No flash. Set aperture size to maximum. Use tripod if you have one if not, grab camera with good tight grip and try to support your arms somehow (1/30 exposure time is too long for steady pictures if you cannot hold camera still somehow). Do not zoom, take distance where your camera still can focus and take many pictures and see if any is good.
Ok ok, I am no photographer but after I learned few basics, my pictures improved A LOT. Real photographers please correct me if I am wrong. Of course this assumes you have at least decent camera, if camera is total c**p nothing can help.
MisterX
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http://img189.imageshack.us/img189/1332/81835390.jpg
Apply flux then resolder the U1U joints that are facing the bottom side of the board (they don't even look like they are soldered), wouldn't hurt to reflow the other pins while you are at it.
Give it a good cleaning and then see what you get.....
Apply flux then resolder the U1U joints that are facing the bottom side of the board (they don't even look like they are soldered), wouldn't hurt to reflow the other pins while you are at it.
Give it a good cleaning and then see what you get.....
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