Capacitor value substitutions

[masonlewisdiesel]

Hey folks,

Got a couple projects that I'm wrapping up. 1: PPCB Electrovibe 2: is a project i'm just starting(bread-boarding currently) a clone of the BYOC Octave Fuzz, which I think is a clone off a Fulltone Octafuzz. For all three of these i've ran into a similar problem(schematics and images attached)

1 I'm all but done with my PPCB electrovibe. but C11 and C22 accidentally put caps rated at 16V in there. How important is the UF rating on things like this? Could I use a different value cap (uf value not voltage).

2 on the octave fuzz C4, kinda a similar question. How critical is that value. I am out of .001 caps. can I go with a .0047 or .01?

I know these are dumb questions, but any help would be cool! is there a formula to figure this out by myself? I know the best thing would be wait for my tayda order. and thats probably what i will do. But this is often a question i've wanted to ask.

 

[gonzo]

The first two are power filtering. Not sure how much it will effect anything like noise if the values are different. It will probably be fine. 16v is fine for the circuit. The second project will probably effect the sound. You can put caps in parallel and add up to the value you need. In series (linked leg to leg) you need to calculate the lowering of values. If the values are the same the total will be halved. If the values are mismatched use this https://www.digikey.com/en/resource...sion-calculator-series-and-parallel-capacitor

Otherwise order new parts.

 

[Nostradoomus]

C11 especially needs to be at least 25v. IT will pop as it's seeing ~18v. C22 is probably okay after the 12v regulator but you might as well swap it out if you're doing the other one.

 

[masonlewisdiesel]

The first two are power filtering. Not sure how much it will effect anything like noise if the values are different. It will probably be fine. 16v is fine for the circuit. The second project will probably effect the sound. You can put caps in parallel and add up to the value you need. In series (linked leg to leg) you need to calculate the lowering of values. If the values are the same the total will be halved. If the values are mismatched use this https://www.digikey.com/en/resource...sion-calculator-series-and-parallel-capacitor

Otherwise order new parts.

Thanks Gonzo for the link! I dig the profile picture too! also on the second project that makes perfect sense! thanks again

 

[masonlewisdiesel]

C11 especially needs to be at least 25v. IT will pop as it's seeing ~18v. C22 is probably okay after the 12v regulator but you might as well swap it out if you're doing the other one.

copy that, thanks! got some on order!

 

[gonzo]

Oh crap, I wasn't looking. Thanks nostradoomus, my voltage comment was wrong. Yeah my profile picture was some old poster art I did for my band. I don't draw so many posters anymore.