Home > VansAirForceForums

-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
w/a Donation

VAF on Twitter:

Old 04-11-2023, 11:32 AM
j4cbo j4cbo is offline
Join Date: May 2022
Location: Seattle
Posts: 21
Default Replacing the AV-50000A

I've been considering removing the AV-50000A in my RV-12 and replacing it with a custom, more targeted distribution board. Why?

1. Simpler wiring means easier troubleshooting
2. Bypassing the "box" for audio and sensor wires means less risk of noise/interference
3. Most importantly, because I think it would be fun

What's wrong with the AV-50000A? Well, it tries to be a "one-stop shop" central box for everything, which is great in theory. In practice, as the avionics used in the RV-12 have evolved, some extra connections need to be introduced that weren't foreseen, so the harnesses again become complicated (e.g. rerouting the trim switch to the SV-AP-PANEL). Meanwhile, some functionality in the AV-50000A (like trim speed control and audio mixing) becomes unused. The idea I've been working on is to replace the AV-50000A with a custom board that exactly meets the needs of my aircraft. And as it turns out, Van's took a similar approach in the 912iS - the Dynon SV-NET bus, audio signals, and firewall-forward instruments all route through the AV-50000A in the RV-12, but they don't go via the AV-60000 in the RV-12iS.

I'm currently planning to keep the existing Van's ignition and switch modules, since they do the job just fine, and design a new board to sit in the middle of everything.

Here's what I've got so far. The board is pretty much complete; the harness documentation definitely isn't (I'm not used to specifying wiring harnesses) but it'll get there. For most "why did you do it this way" questions, the answer is "because I have those parts already": the optocoupler for the stall beep, ATtiny24 microcontroller, tiny 0402 passives, etc. Your mileage may vary. The connectors are Molex Micro-Fit 3.0. Board dimensions are 75mm x 98mm.

Attached Thumbnails
Click image for larger version

Name:	rv12-board.pdf
Views:	57
Size:	46.4 KB
ID:	40905  Click image for larger version

Name:	av-board.png
Views:	60
Size:	525.9 KB
ID:	40906  
Reply With Quote
Old 04-11-2023, 03:16 PM
Mich48041 Mich48041 is offline
Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,515

I admire your skills. What software do you use for the schematic and board?
One reason not to make your own board is that some day you will sell the plane.
Then when the new owner tries to get someone to repair the electrical system,
nobody will know how. On the other hand, if you don't design and install your
own system, you will miss out on a lot of fun. Go for it!
Joe Gores
RV-12 Flying
Reply With Quote
Old 04-12-2023, 10:37 AM
j4cbo j4cbo is offline
Join Date: May 2022
Location: Seattle
Posts: 21

I use EAGLE. It's worked well for me but it's not what I'd recommend - Autodesk bought the company that made it and now it's only available as a subscription
Reply With Quote
Old 04-16-2023, 10:07 AM
DaleB's Avatar
DaleB DaleB is offline
Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 2,367

Originally Posted by j4cbo View Post
I use EAGLE. It's worked well for me but it's not what I'd recommend - Autodesk bought the company that made it and now it's only available as a subscription
I have what I think is the last version of Eagle that was released before Autodesk bought them (7.7.0). I'll never give it up. KiCAD has also gotten pretty good.

Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
Reply With Quote
Old 04-16-2023, 10:54 AM
rcarsey's Avatar
rcarsey rcarsey is online now
Join Date: Jul 2012
Location: North Brunswick, NJ
Posts: 442

Can always give CircuitMaker a try!
Rob Carsey, Winfield Park, NJ
RV-12iS (N713) / Completed 12/2020 / 350hrs and counting
APRS Track or ADSBExchange Track
Reply With Quote
Old 05-14-2023, 01:43 PM
backcountry backcountry is offline
Join Date: Dec 2015
Location: Houston, Texas
Posts: 97

I for one had to remove all the com/audio from the box due to noise.

As time goes on I feel there will be many issues developing due to numerous connections in that box and troubleshooting will be difficult because everything goes to it.
Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -6. The time now is 05:46 PM.

The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.