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Post by pt3r on Jun 8, 2022 9:18:46 GMT
I see, so it's best to order headers and pots from somewhere else? Or do you remove those from the BOM to make sure they're not part of the pcb assembly?
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namke
wonkystuff
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Post by namke on Jun 8, 2022 9:34:51 GMT
I see, so it's best to order headers and pots from somewhere else? Or do you remove those from the BOM to make sure they're not part of the pcb assembly? Yes, I remove those from the BOM for that exact reason. As far as connectors etc. go, the pin headers can of course be bought direct from TW; there are many pots which match the format (Alps & Bourns pots can be got from regular component suppliers such as RS, Farnell, Mouser etc. or 'unbranded' ones from AliExpress as mentioned above). I tend to get the power-connectors and other (mechanical) hardware from eBay  |
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Post by pt3r on Jun 8, 2022 10:02:15 GMT
Cheers! lot's of very useful info, I'll do some math tonight and see what the damage will be to order some prototypes. I won't waste time trying to SMD solder myself.
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Post by pt3r on Jun 8, 2022 19:22:42 GMT
chip shortage f*ck. project on hold. Never knew how hard it could be to build a module. And the website says its in stock, I really don't understand this ordering process. And I thought designing the PCB was complicated.  |
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Post by pt3r on Jun 9, 2022 5:56:22 GMT
I guess so or a step by step on how to order the designed PCB because I am stumped. I would have expected that the design would in some way be converted into the appropriate order but no dice. It seems like the ordering process is the biggest hurdle in a module design who could have guessed. |
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namke
wonkystuff
electronics and sound, what's not to like?!
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Post by namke on Jun 9, 2022 5:57:34 GMT
chip shortage f*ck. project on hold. Never knew how hard it could be to build a module. And the website says its in stock, I really don't understand this ordering process. And I thought designing the PCB was complicated. I usually end up soldering at least one smd chip on my boards — the processors have not been available for some time, so I get all the other components assembled and order the processors from Mouser or RS etc. |
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Post by pt3r on Jun 9, 2022 7:04:14 GMT
Of all the opamps I choose this one is out of stock. I found another one which has a different footprint which messes up the PCB design  back to the drawing board. |
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namke
wonkystuff
electronics and sound, what's not to like?!
Posts: 686
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Post by namke on Jun 9, 2022 12:45:43 GMT
I usually use mcp6002/6004 as they work well with the 5v of AE  |
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Post by pt3r on Jun 10, 2022 15:18:40 GMT
So I finally managed to upload files to order but I'm kinda worried to see that the placement of smt components in the order interfaces is completely of, the components are not aligned with the pcb despite it showing up all correct in the EasyEDA editor, with all drc checks being correct. If this is the way their robots are going to assemble that pcb then I might as well throw my money in the bin. To add insult to injury the holes for the headers and switches don't show up in the order interface neither so I'm very hesitant to confirm the order. namke you have any experience with this issuer? |
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Post by Kyaa on Jun 10, 2022 16:33:19 GMT
So I finally managed to upload files to order but I'm kinda worried to see that the placement of smt components in the order interfaces is completely of, the components are not aligned with the pcb despite it showing up all correct in the EasyEDA editor, with all drc checks being correct. If this is the way their robots are going to assemble that pcb then I might as well throw my money in the bin. To add insult to injury the holes for the headers and switches don't show up in the order interface neither so I'm very hesitant to confirm the order. namke you have any experience with this issuer? JLC's upload process always applies an incorrect rotation to all my components when I upload. It's always been corrected by an engineer after ordering. They won't actually attempt to manufacture it unless everything lines up, and usually get in touch if there's an issue. |
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Post by Kyaa on Jun 10, 2022 16:33:33 GMT
(We are talking about JLC, right?)
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Post by pt3r on Jun 10, 2022 17:23:43 GMT
That's the one yes. But I'm still worried about those faceplates cause the only hole that show up in the gerber view are the ones for the potmeters and the screws the slots for the headers and the switches only seem to go through the top layer despite having specified multi-layer in the editor. They show up correctly in de 2D and 3d view of the EasyEDA editor though.
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Post by pt3r on Jun 15, 2022 6:49:19 GMT
PCBs are ordered now I need to source the other hardware and hopefully we'll have some working modules soon. Pretty exciting to dip my toe in the big kids pool of module design. Fingers crossed. I opted for the leadfree finish to be safe in case I want to lick my modules.
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pol
Wiki Editors
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Post by pol on Jun 15, 2022 11:30:09 GMT
I opted for the leadfree finish to be safe in case I want to lick my modules. I feel this is an important consideration, you may need to rescue split ice cream or similar.....  |
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namke
wonkystuff
electronics and sound, what's not to like?!
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Post by namke on Jun 15, 2022 13:36:40 GMT
PCBs are ordered now I need to source the other hardware and hopefully we'll have some working modules soon. Pretty exciting to dip my toe in the big kids pool of module design. Fingers crossed. I opted for the leadfree finish to be safe in case I want to lick my modules. Yes, I always choose lead-free for this reason too  |
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Post by pt3r on Jun 15, 2022 14:11:21 GMT
Good to hear I'm not the only module licker. I was already wondering whether it was me who was weird.
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namke
wonkystuff
electronics and sound, what's not to like?!
Posts: 686
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Post by namke on Jun 15, 2022 19:59:57 GMT
That's the one yes. But I'm still worried about those faceplates cause the only hole that show up in the gerber view are the ones for the potmeters and the screws the slots for the headers and the switches only seem to go through the top layer despite having specified multi-layer in the editor. They show up correctly in de 2D and 3d view of the EasyEDA editor though. (I tried to reply with a message, but was unable to upload a picture!) Here's a screengrab of an old order (qvca) and the holes for the headers are not there, so I hope that you should be alright  |
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Post by pt3r on Jun 16, 2022 11:36:56 GMT
Ah yes their ordering interface is nothing spectacular but if you specify the confirm production file in your order you can view the routing in some kind of gerber viewer and that does indeed show the right toolpath so I'm optimistic that the slots will be routed correctly.
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Post by pt3r on Jun 16, 2022 11:49:57 GMT
I'm ordering my potmeters and I was wondering whether the potmeter value makes a big difference when your potmeter is basically to serve as an adjustable oltagedivider? Is there a reason to pick a 1M instead of a 50K?
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Post by keurslagerkurt on Jun 16, 2022 15:04:16 GMT
I'm ordering my potmeters and I was wondering whether the potmeter value makes a big difference when your potmeter is basically to serve as an adjustable oltagedivider? Is there a reason to pick a 1M instead of a 50K? In theory it doesn't really matter. In practice it's good to: Not pick too small (that would be a waste because there will be a current flowing through your pot at all time, small values means more current due to ohms' law). I usually try to not go below 1k unless necessary for some reason. (1k at 5V is already 5mA of current per pot, so in this case def pick bigger!) Not pick too big because that will introduce noise (called Johnson noise if i'm not mistaking). Resistors basically have a small noise 'floor' by themselves, and if your currents get real small (with huge resistances), this noise is no Longer neglegible. AFAIK anything below 1M is just fine. So basically pick some value between 10k and 1M and you'll be fine. I have two huge bags of 10k and 100k pots, and I try to build my circuits so that these values fit, which is most of the times fairly easy. In the simple 'pot as divider' case i'd probably go for the 100k, just to consume a bit less current & thus power. |
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Post by keurslagerkurt on Jun 16, 2022 15:07:57 GMT
By the way, stoked to see you dipping your toe in the module building game here!!! 😄 And congrats on the first order, exciting stuff!
If you'd like, i can always send you some small quantities of pots/headers/.. as you're in Belgium as well. I can send them in a letter which means like 2-3 euro's post costs so basically free! Just pm me!
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Post by pt3r on Jun 16, 2022 16:20:13 GMT
The only hardware left to source are the 2x5 headers for the ribbon cable and the pcb spacers, of to ebay.
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Post by pt3r on Jun 21, 2022 7:46:50 GMT
PCBs are ready and on their merry way to casa pt3r. Exciting.
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Post by pt3r on Jun 25, 2022 12:32:55 GMT
Faceplate and pbc line up. Jay! Waiting for my other components which I ordered at robertlanger. Many thanks again to namke for the blank EasyEDA project and all the useful insight. #almostthere
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Post by maydonpoliris on Jun 25, 2022 20:02:19 GMT
wow, looks really interesting, nice work
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back to the drawing board.
