??? 05/03/06 04:59 Read: times |
#115420 - try isolating signal gnd from earth Responding to: ???'s previous message |
and capacitor coupling it instead, if you like. Back when there were long cables on personal computers, and static charge accumulated here and there, then was discharged into earth-ground, as a consequence of periodic movement, as in a printer or the like, this helped with problems like that. Simply cut the signal GND free from chassis gnd, and replace the connection with a 1 microfarad cap of, say, 50 volt working voltage. I've never given this much thought, but it seemed to relieve the trouble.
Another thing that made considerable difference back then, was series resistors, of, say, 4.7 k-ohms on all inputs from switches, pushbuttons, relays, etc. You'll have to pick values appropriate to your specific application, but with CMOS, that was a common value to mitigate such problems. Now, there's no guarantee that your problem is ESD, is there? RE |
Topic | Author | Date |
ESD problem | 01/01/70 00:00 | |
try isolating signal gnd from earth | 01/01/70 00:00 | |
thanks richard | 01/01/70 00:00 | |
Watchdog not really useful | 01/01/70 00:00 | |
hi kalpak | 01/01/70 00:00 | |
re watchdog, never said better | 01/01/70 00:00 | |
hi steve | 01/01/70 00:00 | |
that will NOT help | 01/01/70 00:00 | |
hello erik sir | 01/01/70 00:00 | |
activating the the watchdog while error | 01/01/70 00:00 | |
hello erik sir | 01/01/70 00:00 | |
Pick off brush ? | 01/01/70 00:00 | |
yes | 01/01/70 00:00 | |
this may help | 01/01/70 00:00 | |
So what? | 01/01/70 00:00 | |
Ouch | 01/01/70 00:00 | |
protecting the human | 01/01/70 00:00 | |
But.. | 01/01/70 00:00 | |
And what if... | 01/01/70 00:00 | |
ESDĀ¬precautions | 01/01/70 00:00 | |
static | 01/01/70 00:00 | |
Not from 10mm away! | 01/01/70 00:00 | |
Bad ground | 01/01/70 00:00 | |
Earthing problem! | 01/01/70 00:00 | |
It was observed... | 01/01/70 00:00 | |
TAKE CARE! | 01/01/70 00:00 | |
Is your design based on luck? | 01/01/70 00:00 | |
how do I | 01/01/70 00:00 | |
Some instructions and guideline | 01/01/70 00:00 | |
Thank You steve sir | 01/01/70 00:00 | |
two reasons not to | 01/01/70 00:00 | |
Posting Diagrams | 01/01/70 00:00 | |
It's a pdf-file | 01/01/70 00:00 | |
Where? | 01/01/70 00:00 | |
Oh, sorry! | 01/01/70 00:00 | |
Filename | 01/01/70 00:00 | |
Name | 01/01/70 00:00 | |
Post it to me. | 01/01/70 00:00 | |
Link | 01/01/70 00:00 | |
Perfectly! | 01/01/70 00:00 | |
How | 01/01/70 00:00 | |
Aha... | 01/01/70 00:00 | |
fix it and repost | 01/01/70 00:00 | |
Buttons? | 01/01/70 00:00 | |
No | 01/01/70 00:00 | |
sorry | 01/01/70 00:00 | |
Try | 01/01/70 00:00 | |
the simple way is | 01/01/70 00:00 | |
Thank you | 01/01/70 00:00 | |
For those who need a link to the code | 01/01/70 00:00 | |
after seeing the link | 01/01/70 00:00 | |
So, now you understand why "all of you o | 01/01/70 00:00 | |
Can't open cdr-files | 01/01/70 00:00 | |
Some questions? | 01/01/70 00:00 | |
Yes you are right | 01/01/70 00:00 | |
oops | 01/01/70 00:00 | |
Test | 01/01/70 00:00 | |
Yes | 01/01/70 00:00 | |
stop the frtiggin babble! | 01/01/70 00:00 | |
I guess | 01/01/70 00:00 | |
Photographs ? | 01/01/70 00:00 | |
steve sir | 01/01/70 00:00 | |
No photographs ? | 01/01/70 00:00 | |
Sorry | 01/01/70 00:00 | |
so, it is OUR job | 01/01/70 00:00 | |
I had | 01/01/70 00:00 | |
Ground, earth, soil,... | 01/01/70 00:00 | |
Spark gaps ? | 01/01/70 00:00 | |
maybe he was, but ... | 01/01/70 00:00 | |
Good for surges, but for ESD? | 01/01/70 00:00 | |
Thank you | 01/01/70 00:00 | |
Some more questions | 01/01/70 00:00 | |
Yes | 01/01/70 00:00 | |
Frame, rollers bearings | 01/01/70 00:00 | |
Kai, is it time? | 01/01/70 00:00 | |
Hallelujah! | 01/01/70 00:00 | |
The mess with... | 01/01/70 00:00 | |
Semi isolating semi conducting enclosure | 01/01/70 00:00 | |
I can't see why... | 01/01/70 00:00 | |
I never understood why either, but ... | 01/01/70 00:00 | |
Measurement | 01/01/70 00:00 | |
Forget the watchdog! | 01/01/70 00:00 | |
kai sir | 01/01/70 00:00 | |
Hallo? | 01/01/70 00:00 | |
kai sir | 01/01/70 00:00 | |
What do you expect from a watchdog? | 01/01/70 00:00 | |
Unpleasant. | 01/01/70 00:00 | |
Which is why I doubt it is ESD | 01/01/70 00:00 | |
Curiouser and curiouser | 01/01/70 00:00 | |
instruments | 01/01/70 00:00 | |
you can't | 01/01/70 00:00 | |
Diagnosis ... | 01/01/70 00:00 | |
the difference can be 'legal' | 01/01/70 00:00 | |
expensive is not always expensive | 01/01/70 00:00 | |
Exactly! | 01/01/70 00:00 | |
Killing shock ? | 01/01/70 00:00 | |
Who says that... | 01/01/70 00:00 | |
Trying to improve the performance... | 01/01/70 00:00 | |
Thank you kai sir | 01/01/70 00:00 |