On 1/9/06, <b class="gmail_sendername">harrybissell</b> <<a href="mailto:harrybissell@prodigy.net">harrybissell@prodigy.net</a>> wrote:<div><span class="gmail_quote"></span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
One idea...<br><br>Power the noise module, alone... from a couple of batteries.<br><br>Remove it entierly from the modular, and hook it up with only<br>two wires... a ground and a signal. One shielded cable should<br>be sufficient.
<br><br>If your problems go away... you have power supply or grounding<br>issues.<br><br>If they don't go away... you have something VERY strange in your<br>noise module.</blockquote><div><br>K. Thanks Harry. :) I never thought of that. :)
<br>With the progress that I'd made, after I'd writ the original message, I don't think that it's too severe. :) But, I'm still going to try your suggestion, anyways. :)<br></div><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
You migth try the noise module with only ONE wire... the ground.<br><br>You can try your noise module with NO wires.</blockquote><div><br>This was close to how it was, when I first powered up. It was hooked up (outside of power) only to the scope, to verify it's operation, or not. )
<br>1st - 2N3904 (100 times + 100 times amplification) - almost rail to rail noise on the scope<br>2nd - 2N2712 (same amplification) - noise on the scope was about 60mV peak to peak<br>3rd - different 2N3904 (same as 1st)
<br><br>As I'd said in my last message - changing the 2nd amp to a pot, helped greatly. :)<br><br>I'm still going to check into extra filtering as well, though. With the full amplification and the 2 foot banana cord, just moving the cable away from any other patch cables, greatly helped reduce the amplitude of the noise, through the system. :O
<br></div><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">(I once showed a manufacturer that I could noise hit their solid<br>state relay modules through the air... but totally floating their
<br>module and making a noise spike nearby. They had been blaming EVERYONE<br>else for the problem for months. After that, they went home quietly<br>and fixed their sh!t !!!)<br><br>Where can you see the noise on the scope ???
<br><br>H^) harry</blockquote><div><br></div></div>Harry! You have ALL of the fun in life, with electrical things! :D :D<br>Blaming every1 else, for months. :O hahahahaha. :D Cool experience. :O :)<br><br>The noise on the scope, through all above mentionings, is properly centered about ground, as well. No offsets. It's good looking, anyways. :)
<br><br>I figured at worst case - if I couldn't get this 'repaired' properly, I would just keep a lower amplitude version of it running, as a switch on / off source for the on board Sample & Hold only. :) Shall see what happens tomorrow. :)
<br><br>I came up with a new VCO idea tonight at work. I'm off to the Design section of my webpage, to post it at. :)<br clear="all"><br>Thank you both, greatly, for your help and suggestions! :O :O<br><br>Funny in a way - I come back to building modular gear, after almost 10 years - forgetting a lot of stuff - and run in to completely NEW problems. :O Hahaha. All part of learning. And the help is far beyond, appreciated, from everyone. :O
<br>Someday - I hope to be able to do the same, for others. :)<br><br>-- <br>Take care,<br>Warmth and Peace,<br>Ryk<br><br><a href="http://deathlehem.bravehost.com/damian.html">http://deathlehem.bravehost.com/damian.html</a>
- D.A.M.I.A.N.;s webpage - Jan. 0406 update