DIYEFI.org Forum

I have been working on the changes to the Jaguar A3 PCB based on feedback from my testers around the world (literally), so I have created a "dev" branch to my github Jaguar repository located at:
https://github.com/DeuceEFI/Jaguar/tree/dev

And here is a list of the changes since the A3 PCBs were produced:

Fix R12 and C1 pads from being connected to the ground plane on the Through Hole component side - DONE 03/2012
Delete JP6 (not necessary) - DONE 04/15/2012
Change XOR chip from DIP to SMD - Changed Footprint, still need to regenerate PCB file - DONE 05/13/2012
Make Silk Screen lines thinner for outlines on SMD side
Move R15 label from inside XOR (U5) outline to outside near R15's position -DONE 07/04/2012
Add D37, D38, D40 and D42 to BOM - DONE 04/14/2012

- Improve the silk screen for the LEDs to show anode/cathode orientation - DONE 07/04/2012
- Too much copper around pads, looks like it is set to 8 per hole, 4 would be better/sufficient/good - DONE 07/04/2012
- Along with #9 above, revisit ground plane thermal relief rules to keep from sucking all the heat out of the pad while soldering - DONE, increased Thermal Relief Antipad Size from 0.0200" to 0.0300", Copper Width from 0.0200" to 0.0150" 05/13/2012
- C26, C42 and C43 need to be different part #'s with different lead spacing or the footprint changed back to 3mm disc - DONE 07/05/2012
- Move C17 label outside of U3 - DONE 05/13/2012
- Delete D43 and D44 as the LM2937 is already reverse protected - DONE 04/15/2012
- Fix J2 footprint so that the pin out connections are correct - DONE 05/13/2012
- Re-route power feed to MOV first, then to the input capacitors, then to the regulators - DONE 07/04/2012
- Move FAN and FUEL labels and outlines to observe the 1/16" space from the edge of the PCB for the case slot - DONE 07/04/2012
- Re-route some of the ground plane traces onto the Through Hole side of the PCB to clean up the SMD side (signal side) - DONE 07/04/2012
- Add more space around the BDM header - DONE 07/04/2012
- Remove the 5.6v Zener diode (D3) as it is not necessary since there is no chance of voltage feeding back from the MCU - DONE 05/26/2012
- Add 1k resistor to each output of the MAX9926 to limit current to MCU Port T0 and T1 - DONE 05/26/2012
- Change 5vdc-analog to 5vdc-cpu at CEL (D1) so that the CPU supply is used to power up all the necessary MCU functions. (Analog supply should only be for inputs from the engine) - DONE 05/26/2012
- FTDI USB IC decouple caps are on the wrong side of the feed from R79, and also pretty far from the IC - DONE 07/04/2012
- Check MAX9926 decouple caps to make sure power feed is on the correct side and they are close to the IC - DONE 07/04/2102
- Check the MCU decouple caps are close to the MCU and power is feeding from the correct side - DONE 07/04/2012
- Label GND/RESET/+5v/BKGD near BDM (possibly), might have to shift BDM over a little - DONE 07/04/2012
- C10 and C11 (crystal load capacitors) need to be changed to 20pF to match the manufacturer specifications. - DONE 05/26/2012
- Update BOM to use S912XDP512MAL MCU not the VAL variant as listed. (I used the MAL on all my prototypes). DONE 07/02/2012
- Add git hash to PCB design file for tracking - DONE 07/04/2012
- Update the Jaguar Assembly Manual with photos of the Serial #1 build. - DONE 07/05/2012
- Add instructions to use High Temperature Silicone or something similar to brace the upright components - DONE 07/05/2012

And I have updated the Jaguar A3 Assembly Manual with pictures from my Jaguar A3.S1 build and it can be found in my github repository at:
https://github.com/DeuceEFI/Jaguar-Assembly-Manual

Have a look at the files (in KiCAD) and let me know if you see anything that needs to be addressed that I may have missed.

Thanks,

[Edit 10-25-2012: Changed subject from Jaguar A4 PCB Status to Jaguar 0.4-alpha PCB Status (was Jaguar A4 PCB Status)]

Hi Deuce,

Top stuff!

I dont have KiCAD and refuse to use it at present, but can I just ask whether you are going to look at the pcb trace width's in detail? I am of the opinion that some of them are not wide enough on the A3 revision PCB. An example of this is the ground loops from the injector driver FETS.

Just something that I thought was worth asking about.

Cheers,

Dan

You refuse to use it even to view? Perhaps Andy can knock out some PDFs for you, then?

that would be nice! PDF's are cool! I am trying not to install apps that I dont really use, not very successful lately though, but I am trying not to!

if it isnt too much trouble then please publish to PDF for me Deuce!

That's such a windows attitude! :-) I do the same on win. My strategy is "no closed source apps" and also "install as many foss apps as you like" which results in a fast machine that never goes down. There's a clue here :-)

it is a windows attitude i agree.

DeuceEFI wrote: - Delete D43 and D44 as the LM2937 is already reverse protected - DONE 04/15/2012

Hi Andy,

I highly recommend to keep them!
Yes, the voltage regulators are reverse polarity proof - but the polarized caps (C12, C13) are not.
Besides, the diodes help buffering positive voltage in the caps. Without, C12 and C13 would bleed back into the supply line in case of surges or negative spikes, making them pretty useless.
The forward drop of 0,55 V won't hurt that bad at cold cranking situations.

Keep up the good work!

GJ

lumpensack2003 wrote:

DeuceEFI wrote: - Delete D43 and D44 as the LM2937 is already reverse protected - DONE 04/15/2012

Yes, the voltage regulators are reverse polarity proof - but the polarized caps (C12, C13) are not.

Doh, this was my call, and my mistake! Sorry Andy! :-o

My repo now has updated Jaguar-Schematic.pdf and Jaguar-PCB.pdf files for review

Fred and I spoke via Skype this morning and I'm going to change the ground connections to one per Injector FET and increase the size of the traces back to what they were for the A3 board.

Fred wrote:

lumpensack2003 wrote:

DeuceEFI wrote: - Delete D43 and D44 as the LM2937 is already reverse protected - DONE 04/15/2012

Yes, the voltage regulators are reverse polarity proof - but the polarized caps (C12, C13) are not.

Doh, this was my call, and my mistake! Sorry Andy!

No worries, I can add them back