<html>
<head>
<meta content="text/html; charset=windows-1252"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<div class="moz-cite-prefix">See if you can take the encoder out and
inspect it.<br>
<br>
If it's optical, it may be a fluff-problem, or dirty pickup
optics; a good clean may help, <br>
<br>
If its a mechanical encoder, again, disassemble and clean it, it
could still be a fluff-problem. A squirt of contact cleaner may
also be beneficial<br>
<br>
-mark<br>
<br>
<br>
On 6/11/2016 5:57 PM, Charles Manning wrote:<br>
</div>
<blockquote
cite="mid:CAE21AQqwtpx0Ax8CD=Eij_U-NztoZzd328HS5WZ0w-FVFA9oOw@mail.gmail.com"
type="cite">
<div dir="ltr">
<div>A capacitor across the contacts might help.<br>
<br>
</div>
<div>What is the value of the pull up resistor? How often do you
expect to see pulses (if it was clean)?<br>
<br>
</div>
<div>Set the capacitor so that the RxC = about 1/10 of the
period of the nominal "clean" frequency you want.<br>
<br>
</div>
<div>Alternatively, if you have a scope handy and can see the
glitches, set the value to about 5 x the period of the
glitches.<br>
<br>
</div>
<div>That should give you a reasonable starting point.<br>
<br>
</div>
<div><br>
</div>
Rotary encoders should be doing quadrature encoding. I've seen
that messed up in firmware at least 50% of the time.<br>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Sun, Nov 6, 2016 at 5:44 PM, Volker
Kuhlmann <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:list0570@paradise.net.nz" target="_blank">list0570@paradise.net.nz</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">I have a
digital power supply that has developed a bounce problem
with<br>
its twiddle knob, making it pretty much unusable. Someone at
the last<br>
meeting mentioned the quick fix is to put in a capacitor,
but I don't<br>
remember the details. Is the capacitor across the contacts?
And what<br>
value? 100pF? 100nF? Wouldn't burn 100nF the contacts out?<br>
<br>
Obviously this tool has s... firmware, but I can't fix that.
Plan B is<br>
to try and replace the encoder, but if a quick fix works
that'll save<br>
some headaches with models, sizes, etc.<br>
<br>
Thanks muchly,<br>
<br>
Volker<br>
<span class="HOEnZb"></span></blockquote>
</div>
</div>
</blockquote>
<br>
</body>
</html>