.01uf polystyrene 100 volt capacitor

[soupbone]

I'm looking for some .01uf polystyrene 100 volt caps for this clyde mccoy wah I'm building.I found some at mouser,but they were 50 volts.Anybody know where i can find some that are 100 volts?

[JKowalski]

There is no need for 100 volt rated caps. No voltages over the power supply voltage should be present when working correctly...

Rule of thumb I use is 1.5-2 times voltage rating of theoretical maximum voltage across part. For example, as a filter cap for a 9v power line I would use 15v rated minimum, maybe 25v if the part wasn't appreciably bigger and it was a good fit.

[R.G.]

Unless you're just trying to duplicate the originals or something, the 50V parts will work fine. An inductor style wah runs on 9V. 50V parts work fine in there.

[soupbone]

Unless you're just trying to duplicate the originals or something, the 50V parts will work fine. An inductor style wah runs on 9V. 50V parts work fine in there.

Yeah,I was trying duplicate the original from a vox 1967 datasheet.If 50 volts will work fine,Then I'll do that then.Thanks R.G.!

[soupbone]

There is no need for 100 volt rated caps. No voltages over the power supply voltage should be present when working correctly...

Rule of thumb I use is 1.5-2 times voltage rating of theoretical maximum voltage across part. For example, as a filter cap for a 9v power line I would use 15v rated minimum, maybe 25v if the part wasn't appreciably bigger and it was a good fit.

Good info.Thanks Chris!

[PRR]

9V pedals don't need over 10V cap rating, 20V to be safe.

> duplicate the original from a vox 1967 ....  100 volt caps

I'm going to guess (based on old knowledge) that in 1967 a 100V rating was just the standard for that rating and material. We still had higher-voltage stuff. And smooshing polystyrene as thin as 50V rating is tricky.

But there's a lot more low-low-volt stuff now, everything has to be smaller than an iPod Nano, they learned to shave poly down to 50V rating and hardly anybody is asking for higher ratings.

BTW: when you solder polystyrene you MUST be careful. They are VERY easy to melt, which causes an internal short. I swore-off polystyrene for this reason. In 0.01u for audio I would use any other poly cap (not ceramic, not without further study) before I'd use PS. If you must, then use good heatsinks on the leads. Clean flat-jaw needle-nose pliers clamped with a rubber-band. Maybe with a bit of damp tissue: if it sizzles, it's too hot.