Analogue Section Reference Voltages

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quango
 
Posts: 57
Joined: Thu Aug 13, 2009 5:49 pm

Analogue Section Reference Voltages

Post by quango »

Hi,

As I'm trying to troubleshoot my 2nd x0x i thought i would map out the voltages on my other working x0x as a reference. I've done this as a new layer in the Freeware Eagle Layout 5.6 software over the ladyada Eagle mainboard layout.

Here's the modified file to load into Eagle layout
mainboard_with_analogue_volts.zip
(62.9 KiB) Downloaded 4593 times
As I'm a total novice myself someone may want to go over this file to OK it but hopefully its fairly accurate. I set every working x0x dial to 0 except for Cutoff which was at about the 2o'clock position.

If you spot any glaring errors please pm me or post here.

I've noticed depending if you hit keyboard buttons when testing voltages this can alter volts drastically in the vco IC's and therefore other parts of the VCO. I believe I had my x0x in keyboard and pressed C to get 2.0V

reedlaw
 
Posts: 35
Joined: Tue Sep 02, 2008 6:20 am

Re: Analogue Section Reference Voltages

Post by reedlaw »

Wow, this is awesome. It will help me a lot. I'm working on my 2nd x0x as well and I need this to troubleshoot. Thanks for the great work! :D

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hamburgers
 
Posts: 1058
Joined: Wed Dec 21, 2005 8:25 pm

Re: Analogue Section Reference Voltages

Post by hamburgers »

stick-eeeeeeeeeeeed

thanks

Gorx
 
Posts: 6
Joined: Thu Jan 08, 2009 1:11 pm

My Xoxbox with Noisy Output

Post by Gorx »

I have done some measuring of volts starting from J4 working my way up and found out that my xoxbox has 0 Volts at D25. Is there a switch I didn't turn right?

I suspected Q24, Q25, Q8 or Q27 could be faulty(?) but that's not the case, I changed Q24 and Q25, and swapped Q8 and Q27... nothing improved.

D25 @ 0Volts anyone...???

MartinDidymus
 
Posts: 43
Joined: Thu Jul 22, 2010 8:53 am

Re: Analogue Section Reference Voltages

Post by MartinDidymus »

I have uploaded a png file for anyone without Eagle software.

Image

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ClockLoop
 
Posts: 58
Joined: Wed Aug 19, 2009 1:31 pm

Re: Analogue Section Reference Voltages

Post by ClockLoop »

AWESOME

VERY useful, thank you.

(this helped me find a 1 meg resistor that was swapped with another resistor of incorrect value.)

:P

rarara
 
Posts: 169
Joined: Wed Apr 05, 2006 9:47 am

Re: Analogue Section Reference Voltages

Post by rarara »

is anyone able to flip the .brd supplied above??? i am following the doc and testing my voltages but doing it from the faceplate side for ease. would be much better if the board was flipped, but can't seem to do it with the (freeware) version of Eagle.

anyone help?? :(

mattittam
 
Posts: 5
Joined: Tue Feb 18, 2014 9:16 pm

Re: Analogue Section Reference Voltages

Post by mattittam »

thank you so much!!!

Chris72160
 
Posts: 44
Joined: Wed May 01, 2013 6:24 am

Re: Analogue Section Reference Voltages

Post by Chris72160 »

Thank you. Great!

Are anywhere the reference voltages for the io-board available, too?

Greetz Chris

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NNDMT
 
Posts: 2
Joined: Thu Sep 22, 2016 6:35 pm

Re: Analogue Section Reference Voltages

Post by NNDMT »

quango wrote:Hi,

As I'm trying to troubleshoot my 2nd x0x i thought i would map out the voltages on my other working x0x as a reference. I've done this as a new layer in the Freeware Eagle Layout 5.6 software over the ladyada Eagle mainboard layout.

Here's the modified file to load into Eagle layout
mainboard_with_analogue_volts.zip
As I'm a total novice myself someone may want to go over this file to OK it but hopefully its fairly accurate. I set every working x0x dial to 0 except for Cutoff which was at about the 2o'clock position.

If you spot any glaring errors please pm me or post here.

I've noticed depending if you hit keyboard buttons when testing voltages this can alter volts drastically in the vco IC's and therefore other parts of the VCO. I believe I had my x0x in keyboard and pressed C to get 2.0V
Are these voltages for a finished xox? :)

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