Large number of flickering/ghost inputs on Master Cards

[iwik]

I understand Jack. Did some more checking on my setup. I can replicate your problems, int some times but I found that
a lot of inputs in Sioc Monitor would be lit green until I pulled out J3 connector and this was with NO ALL ON commanded.
My wiring isn't what you call best practice but to me indicates layout is the culprit.
You could try and slowly disconnect cable to input board that connects to J3. This may lead you to possible reasons for this flickering. I don't think there is anything wrong with your hardware but just an quirk in the design coupled with its hookup.
Other than that it means rewiring or changing to someone else's interface and software geared to the plane u use.
Very hard to offer much more from where I am.
Les

[Perik]

Hi All

I expect you've seen the new Mastercard from OC:
Master_SMD_grande.jpg
What do you believe the beast in the upper right corner is – a +5V noise killer deluxe
I'm sure this is not without a reason and could be the solution for Jack as
well – add a decent Electrolyte Cap and a few 0,2uF around the IC's.
As usual OC is very quiet about changes.

[iwik]

Perik,
Definitely worth a try, I did bypass the 5v line on my card with a 47u but it did not help. All chips should have their
5v lines decoupled with at least 0.1u and Jack would be best served by adding these to the bottom of the PCB wired
directly across the chips supply pins.
Regards
Les

[Boeing 747 Flyer]

Hi Perik,

I have just noticed your post... Honestly cannot believe that is a coincidence! Obviously I do not wish to purchase a new master card, so it looks like I will be fitting the capacitor(s) myself. I am a bit unsure as to the EXACT pins and which capacitor ratings I should be using.

Les/Perik, do you have an accurate copy of an MC circuit diagram which shows where I should connect said capacitors (which exact pins)? My father has much more electrical experience in this particular area as opposed to myself so I will also be conferring with him regarding the fitting of these capacitors. Equally however, I don't want to plaster the MC with capacitors only to be left worse off from where we started.

Cheers,

Jack

[iwik]

Jack,
Our good friend Perik has nice diagram that he redrew when he made his own boards. Look at this link and on the
diagram you will see chips labeled U and u will see connections with pin numbers and VCC, VDD and Gnd marked for
each chip. What you ned to do is to solder a 0.1u 50v ceramic cap between VCC or VDD and GND on each chip. Most electronic diy stores will have these. Just make sure
when soldering that you don't short to the next pin. Check each of your connections with a multimeter before repowering.
Here is Periks diagram.
http://www.hoddo.net/images/ocboard/MasterCard-sch.pdf
Also put something like a 470 microfarad across the 5v connector of the master cards. Make sure you get the Polarity right.

Les

[Perik]

Jack,

You need to do some cleaning...

Boeing 747 Flyer has exceeded their stored private messages quota and cannot accept further messages until they clear some space.

[Boeing 747 Flyer]

All done Perik! Send away

[Boeing 747 Flyer]

Hi Les/Perik/David,

Just to make sure you don't think this thread has died, I have all the necessary caps and should be soldering them in this weekend.

I sent an email to Alejandro regarding the release of the new mastercard to see if some of the new features could be retrofitted to my card to reduce the noise, but have heard nothing back.

Jack

[Boeing 747 Flyer]

Hello all,

Unfortunately the fitting of the capacitors has made absolutely no difference whatsoever, still the same flickering. We are starting the process of neatning everything up and getting all the wiring on the same frame, but I am really doubtful that will work. Still no response from OC.

[iwik]

Jack,
Sorry to hear that, still think what you are doing will be the best. Many people have used o/c cards to I/f O/H panels
without difficulty and seeing you have tried new cards it only leaves wiring.
As I suggested earlier can you try disconnecting your wiring to J3 one by one, it may show something.
Don't give up.
Les