Archibald Capacitor Question

[joelorigo]

Hello! My first post.
I recently bought the Archibald PCB and I'm about to start building it. I see that the build document lists 1 470pf electrolytic cap as 25v and 2 that are 16v. These are C16, C24 & C25.  I don't see any indication in the document or on the PCB as to which one needs to be the 25v.

[mauman]

Welcome!  That info is on the schematic: C16 is the 25V, C24/C25 are the 16V. 

As long as they will tolerate the 12V bus voltage, anything would be fine - they could all be 16V, or 25V, or 50V.  Higher voltage caps may last a few years longer, or be slightly better in other ways, but they're also usually larger and cost a bit more. 

[joelorigo]

Ohh d'oh! Of course. Well there's my first post, a complete noob question.

Thank you for answering!

[joelorigo]

And with the 1mH inductor, there is no polarity? First time I've used this part.

[madbean]

And with the 1mH inductor, there is no polarity? First time I've used this part.

No inductors do not have polarity.

[joelorigo]

Thank you!

[joelorigo]

Not about capacitors, but I just realized that the power supply I was going to use with the Archibald is center +. Eek! good thing I thought of this in advance. What is a good 12v power supply out there?


EDIT: I'm finding many of the 12v ones are center positive. I did see this:
https://www.sweetwater.com/store/detail/1SpotCYR--truetone-1-spot-reverse-polarity-converter

Is that something I can use with my 12v 750mA center positive supply to power the Archibald. Actually, I think I actually have one from a Godlyke Power All that I bought a long time ago.

[jimilee]

Seems like the ma needed are in the build doc, you may need more than that, I can't remember right off, or it may be the other tube drive.


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[joelorigo]

Yep, it suggests a 500mA. I'm questioning polarity, assuming that it is center negative like most pedals.


EDIT: I now see in the schematic it says center negative.

[jimilee]

Yep, it suggests a 500mA. I'm questioning polarity, assuming that it is center negative like most pedals.


EDIT: I now see in the schematic it says center negative.

Sorry about that. You can pretty much assume everything is center negative unless it's a fuzz or a deluxe memory man.


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[joelorigo]

No worries. I'm having trouble finding a center negative 12v supply.  I have an unused 12v 750mA center POSITIVE.

Do you know if I can use the polarity coverer above?

Or this one?
https://www.amazon.com/Voodoo-Lab-Reverse-Polarity-Barrel/dp/B00ADWTYWU/ref=sr_1_3?crid=T8TREUYK7E4M&keywords=voodoo+lab+polarity&qid=1675201352&sprefix=voodoolab+polaity%2Caps%2C108&sr=8-3

[mauman]

Yes, either one of the polarity converter cables you linked to will work.  And you couldn't make one yourself for less than $2.99...

[joelorigo]

Thanks guys. It turns out I have 2 of the red adapters from the Godlyke Power All I have, and a one with a red end that came with my Pedal Power 2+. I never used them and I'm glad I saved them.

[joelorigo]

Any opinions on using this for the Archibald? It has 12v and a way for either polarity.

https://www.amazon.com/gp/product/B08SQ8NZ21/ref=ox_sc_act_title_1?smid=A2WETDVOSZN7JY&psc=1

[jimilee]

That will work, but you're gonna want to eventually get a decent power supply for yourself. Those universal adapter can sometimes act a little wonky and introduce artifacts into your sound. Someone was troubleshooting theirs because of that very thing, turned out to be a similar power supply.


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