Searching \ for '(ot) noisy wire-wrapped project' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/index.htm?key=
Search entire site for: 'noisy wire-wrapped project'.

Truncated match.
PICList Thread
'(ot) noisy wire-wrapped project'
2000\03\22@145800 by Jane Ifurung

picon face
Helpppp! I had my circuit wire-wrapped and found out
that it's so noisy. My project is a voice multiplexer
and I have subscriber line interface circuit(SLIC),
codec, relays, transformer, and logic ICs. I did not
use bigger wires for the power supplies.

Any idea what caused this and ways how to reduce the
noise? Any site that would be useful?

I used vector board and no ground plane.

Hoping for your answers.

=====
*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~
Jane Ifurung
UP Diliman, Quezon City
920-5301 loc 5854
(632)731-3545
spam_OUTjifurungTakeThisOuTspameee.upd.edu.ph
*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~

__________________________________________________
Do You Yahoo!?
Talk to your friends online with Yahoo! Messenger.
http://im.yahoo.com

2000\03\22@152635 by Chris Eddy

flavicon
face
Jane;

I will put a case of beer on power supply routing on your prototype.

All audio and digital grounds must be kept seperate.  Return them
seperately to the central power point with a big filter cap at the
center.  Never mix ana and digi together.
(the secret is not wire gauge, but the fact that digital switch currents
are passing through the same ground traces that you are using for your
analog circuits).

Also, add the obligatory 0.1 mic caps everywhere.  But they will not
make up for ground layout.

Chris Eddy

Jane Ifurung wrote:

{Quote hidden}

2000\03\22@160805 by Arthur Brown

flavicon
face
I recall a memory board that was wirewraped we this used on a 8080 sbc micro
controller, The power supply was the problem the wire all went in the same
direction across the board, we removed the power and rewired the power at
900 with a larger gauge wire from 35g to 22g {if my memory is ok... no pun
here} This and loads of caps sorted the noise problem.
also some people run all the wraps in a cableform the noise from other wire
are unbelivable, I liked to wire point to point myself.

{Original Message removed}

2000\03\22@214450 by Jane Ifurung

picon face
--- Arthur Brown <artbspamKILLspamCABLEINET.CO.UK> wrote:
> I recall a memory board that was wirewraped we this
> used on a 8080 sbc micro
> controller, The power supply was the problem the
> wire all went in the same
> direction across the board, we removed the power and
> rewired the power at
> 900 with a larger gauge wire from 35g to 22g {if my
> memory is ok... no pun
> here} This and loads of caps sorted the noise
> problem.

---- Where do I place the caps and what kind of caps
to use? I only have bypass capacitors in every digital
chip.

> also some people run all the wraps in a cableform
> the noise from other wire
> are unbelivable, I liked to wire point to point
> myself.
>
> {Original Message removed}

2000\03\23@124039 by Harold M Hallikainen
picon face
       Once again, I'm gonna push "ground plane". There's just too much
possibility of chips disagreeing on where ground is without it. A
prototype board that has a ground plane but has each pad isolated from it
should be good. Just do a short solder or wire bridge from the pin to the
ground plane. Similarly, power supply bypass capacitors would be located
at the power pin with the other lead going to the ground plane.

Harold




FCC Rules Online at http://hallikainen.com/FccRules
Lighting control for theatre and television at http://www.dovesystems.com

________________________________________________________________
YOU'RE PAYING TOO MUCH FOR THE INTERNET!
Juno now offers FREE Internet Access!
Try it today - there's no risk!  For your FREE software, visit:
dl.http://www.juno.com/get/tagj.

More... (looser matching)
- Last day of these posts
- In 2000 , 2001 only
- Today
- New search...