Where do the bridges go on the v4 core board

[Al99]

Hi can someone show me a photograph of a completed v4 core board? I'm having trouble working out where the bridges go. Thanks.

[latigid on]

Is it a two-layer board with green soldermask? Then no bridges are required.
If it is a single-layer board, find the "quickview" or .brd file on uCapps. Probably the red wires represent the top bridges, with blue as the bottom layer already patterned on the copper side.

Feel free to post a picture of your board here to check.

[Al99]

https://drive.google.com/file/d/1ZF-YkU6N4r9ZRbdhiJuLq18oYEIR8xMw/view?usp=sharing

 

https://drive.google.com/file/d/15sfAITc5hjAd4R9BJO7jcFls5jODFfZA/view?usp=sharing

 

ok I have had to use google drive for the pictures as this site gave me an error for uploading the pictures. The board I guess is version 4 double sided and it says CORE_R4D on it, are any bridges needed for this board? If so where do they go? also on the first picture what are those 5 holes near the bottom of the pic for, I have put a resistor bridge between 2 of them so I will have to take it out, what are the holes for? do any bridges go there? if so how do they connect? Many thanks for your invaluable help, alistair.

[latigid on]

I can't access your google drive. You can upload images here but the size should be less than 2MB and certain extensions (tiff I think) don't work. PNG/JPEG should be fine.

If it has green soldermask and visible traces/copper on both layers I am pretty sure you don't need bridges.

[Al99]

Hi latagid thanks for getting back to me! I have managed to upload the pictures. The board I guess is version 4 double sided and it says CORE_R4D on it, are any bridges needed for this board? If so where do they go? also on the first picture what are those 5 holes near the right side of the pic for, I have put a resistor bridge between 2 of them so I will have to take it out, what are the holes for? do any bridges go there? if so how do they connect? Many thanks for your invaluable help, alistair.

Edited October 23, 2020 by Al99

[latigid on]

Hi Alistair,

Generally I would only populate parts where there is a silkscreen indicator. This is certainly a double-sided board and the Core is quite a basic circuit, so you won't need any jumpers I am 99% sure. All pin headers seem to be indicated with a J prefix.

Any plated holes that don't have a corresponding silkscreen mark are probably vias that join the top and bottom copper planes. You will probably be able to see the copper tracks leading to the vias from the difference in colour. Or if there is no track, the via connects to a 0V/ground plane But yes, it is harder to make out with black solder mask!

If you are unsure, put your multimeter in continuity test mode (or resistance) and check the electrical connections. 

Best,
Andy

[smashtv]

On 10/23/2020 at 9:41 AM, latigid on said:

Is it a two-layer board with green soldermask? Then no bridges are required.

No jumpers on my R4C and R4D pic based core layouts.  My PCB layouts usually have an "R" designation to avoid confusion vs. the official layouts that usually had a "V" designation.

Andy is correct, except the ones John produces (modular addict shop) are black silkscreen, and the ones from my shop (midibox-shop.com) were green silkscreen. 

John's also have some very slight differences with silkscreen (lot code for the pcb fabricator and UL 94 declaration) and soldermask (blind vias vs. exposed vias) but everything else is the same.

We used to call this one the "Core8", but in the years since it is more commonly referred to as "PIC Core".

Lots more specifics for R4D here: http://midibox-shop.com/mbhp_coreR4d.html

And for some of my other layouts here: http://midibox-shop.com/info.html

Also if you are building a SID you will need to terminate the CAN bus with a 1k resistor and a diode or it will likely either reset at random or get stuck in a boot loop.  Plenty of info on that change here in the forum posted years ago. 

Best Regards!

 

Tim

 

 

 

 

 

[Al99]

Where is the CAN bus please, where do I put my 1k resistor and diode?

Thanks.

[smashtv]

12 hours ago, Al99 said:

Where is the CAN bus please, where do I put my 1k resistor and diode?

Thanks.

Take a look at http://ucapps.de/midibox_sid_manual_hw.html in the 'Minimal requirements' section.

And this schematic http://ucapps.de/midibox_sid/mbsid_v2_communication.pdf from the 'Resources' section.

There are more details about it posted long ago here on the forum. 

 

Best regards

Tim