Search found 27 matches
- Fri Apr 22, 2016 7:45 pm
- Forum: FV-1 hardware questions
- Topic: My designs are always noisy :(
- Replies: 22
- Views: 17825
That looks much cleaner. You will almost always have to put in some break in the ground plane to route signals but as long as you try to avoid the current return paths, avoid running signals in parallel to each other (watch for that between layers), etc. you can usually get a good clean PCB. Great!...
- Fri Apr 22, 2016 12:58 am
- Forum: FV-1 hardware questions
- Topic: My designs are always noisy :(
- Replies: 22
- Views: 17825
- Thu Apr 21, 2016 2:12 pm
- Forum: FV-1 hardware questions
- Topic: My designs are always noisy :(
- Replies: 22
- Views: 17825
Here you go. Let me know if you would like anything clarified!frank wrote:Would be easier to look at if each layer were posted separately, can't realy see if there are any issues on the bottom layer.
Thank you for looking this over and being so helpful!
http://imgur.com/a/nxfef
- Tue Apr 19, 2016 5:35 pm
- Forum: FV-1 hardware questions
- Topic: My designs are always noisy :(
- Replies: 22
- Views: 17825
Okay, so Im convinced the problem was my layout. Nothing else would seem to make sense at this point. I have added some additional pads for bypass caps (just in case) on the plugin board, and increased the number of via's between the ground planes. Some of the pins on my original PCB were not connec...
- Tue Mar 22, 2016 2:22 pm
- Forum: FV-1 hardware questions
- Topic: My designs are always noisy :(
- Replies: 22
- Views: 17825
- Sat Mar 19, 2016 2:29 pm
- Forum: FV-1 hardware questions
- Topic: My designs are always noisy :(
- Replies: 22
- Views: 17825
- Fri Mar 18, 2016 4:19 pm
- Forum: FV-1 hardware questions
- Topic: My designs are always noisy :(
- Replies: 22
- Views: 17825
OK, a few items to check: You only have a 1nf on the AVDD/DVDD pins on the FV-1, that should be 100nf (0.1uf). You don't have a bypass cap on the EEPROM, add a 0.1uf. Do not tie anything to pin 3 of the FV-1 other than the 1uf cap!!!! It looks like you have pin 2 tied to it in the schematic. If onl...
- Wed Mar 16, 2016 11:19 pm
- Forum: FV-1 hardware questions
- Topic: My designs are always noisy :(
- Replies: 22
- Views: 17825
Please post complete final schematic of all boards, etc. Also higher res images of the boards as I cannot zoom in on the current one. http://imgur.com/a/oNaeg Here is an album, first 2 pictures are of the plugin board the FV-1 is on. It has a ground plane on both sides. The second two pictures are ...
- Tue Mar 15, 2016 9:18 pm
- Forum: FV-1 hardware questions
- Topic: My designs are always noisy :(
- Replies: 22
- Views: 17825
Here is the schematic and board layout I used too. It is slightly different from my original post. :wink: http://imgur.com/a/uALhy Im almost at the point of buying a development board to compare against. Ive been having so many noises issues with these designs. Not sure what Im doing wrong, or if my...
- Tue Mar 15, 2016 9:13 pm
- Forum: FV-1 hardware questions
- Topic: My designs are always noisy :(
- Replies: 22
- Views: 17825
Hi Finally got the opportunity to build this I used my soundcard (Mbox 2) to pickup the output noise on the main card the fv-1 is on. Here are are the noise plots Im getting. Not sure what it is so different for each channel. This is straight off the outputs after the passive filter recommended in t...
- Mon Feb 15, 2016 7:23 pm
- Forum: FV-1 hardware questions
- Topic: My designs are always noisy :(
- Replies: 22
- Views: 17825
I don't see the filtering there to remove the high frequencies from the delta sigma converters, i.e. there is no 1K/2.2n cap on each of the outputs. Also, any filtering should be on the small board, as close to the pins as possible. Hi, its there. R7/C4 and R12/C7 on the larger PCB. I will move the...
- Sun Feb 14, 2016 1:31 pm
- Forum: FV-1 hardware questions
- Topic: My designs are always noisy :(
- Replies: 22
- Views: 17825
There are lots of possible causes of noise, how clean is your power source? If possible try a battery to power it to eliminate the power supply as the source of noise. I looked at the schematic and boards and they don't seem to match up, the top schematic seems to have only one header but the small...
- Sat Feb 13, 2016 5:50 pm
- Forum: FV-1 hardware questions
- Topic: My designs are always noisy :(
- Replies: 22
- Views: 17825
My designs are always noisy :(
Hi I have been through quite a few different iterations of FV-1 based PCB designs. Unfortunately, they are always too noisy to be useful. I think part of this has to do with my layouts (Might be my ground plane too), but I think I have finally figured out a solution. I was trying to cram everything ...
- Thu Feb 05, 2015 1:37 pm
- Forum: FV-1 hardware questions
- Topic: distortion on low output signal?
- Replies: 13
- Views: 10230
Okay, so fun little update. APparently this issue only exists on 1 of my bioards. Im going to try building some more powerful low pass filters In the YT video it sounds like you are getting hiss not distortion, if that is the case you might need to do some signal filtering which should get rid of an...
- Wed Feb 04, 2015 6:54 pm
- Forum: FV-1 hardware questions
- Topic: distortion on low output signal?
- Replies: 13
- Views: 10230