Circulator R4 print error

M

markseo

Member
Hi, first time here. Loving all the designs by PedalPCB and really looking forward into building quite a bunch. But I have found an issue when starting a Circulator. My PCB has the values of each component instead of R1, R2, etc printed (so for example, in the place of R1 it directly says 10k). Problem is checking the BOM R4 is supposed to be a 10k resistor, but on my PCB the print says 100K, so R26 and R4 seem to be the other way around. Is this something known (I havent found anything doing a quick search)?

I am following the official pdf (https://docs.pedalpcb.com/project/Circulator.pdf) but my PCB only has the actual component values printed.
Thanks!
 
In such case I am missing stuff from a musikding kit cause it came with the resistors for the BOM, not for the printed PCB (as for example, Ill need more 1M resistors).... this is a big PITA
 
You really shouldn't be missing parts. The components were just moved around on the board, the values weren't changed.

There should still be the same number of 1M resistors, they're just in different places compared to the image in the build doc.

Follow what is printed on your PCB.

This should be the correct PDF for your revision of the PCB:
 

Attachments

The kit came with 2 1M resistors (as the BOM states), but in my PCB it says I need 3, one for R2, another for R3 and another one for R100
 
Oh indeed I see R3 is 1K, and there is another 1K right under the IC3 and the 1M resistor

1K resistors where not included with the kit.
 
Okay I see, you have the first revision of the board (there have been three). That's a fairly old one, the only changes made have been to the LED circuit. Use a 4K7 in the place of that 1K (since that's what you have), it's the current limiting resistor for the LED. If you find that the LED isn't bright enough you can reduce it.

Aside from that, follow what is marked on the board. The board is correct.

It looks like Musikding is using the current build docs but still had an old version of the board.
 
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So everything is the same as the documentation you have sent me except for those 1k resistors that I need to replace with the 4k7s?
 
In that case, theres one 4k7 missing. As the printed PCB already has 2 correctly named 4k7, plus other 2 named 1K but the kit came with 3 4k7 resistors. I guess I have spares, but this is incredibly misleading and gives and absolute sense of abandoning clients
 
Install the long lead of the LED (Anode) into the center pad and the short lead into the pad on the right (marked G).

You can omit the 1K resistor on the bottom left-hand side of the board, it was only used for the dual color LED which was later removed because it never really worked all that great with most two-color LEDs.

I apologize for the confusion but that board was updated over a year ago, I had no idea there were even still any of those left in the world.
 
Also theres a 1u electrolytic (I guess C13), but all the 1u caps on the kit are film, so no polarity. Should I just solder any of the 6 film caps included (which by the way, are quite big so dont properly fit on the board).

I hope you find someone else to sell kits in Europe because I am not getting nothing from musikding ever again, this is extremely discouraging.
 
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