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Old 21st June 2008, 05:47 PM   #1
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Default help in changing cap values for a disto stompbox


I hope this is the right forum to post, if not just tell me.

I'm building this:

Click the image to open in full size.

and I just noticed I don't have any 0.1 uF cap. My guess is that both 0.1 uF caps are used to filter out DC voltage, so I plan to replace them with 1 uF ones. As I'm quite new at DIY audio electronics though, maybe I'm missing something.

So, what do you think? Is my guess correct ? Will the stronger cap values cause the universe to implode ?

Thanks in advance for your answers.
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Old 22nd June 2008, 08:09 AM   #2
Nordic is offline Nordic  South Africa
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They also form a lowpass filter, I would not venture too far from the original values... just about any broken electronics (pre surface mount) should yield a few 100n caps... they might be marked 104, or 100n or 0.1u
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Old 22nd June 2008, 02:44 PM   #3
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Thanks for the answer. I have finally found a broken radio with a few cermacic caps labelled 104M, I guess they will do the trick.

About the lowpass filter I wasn't sure since there was no resistor with the cap (all the low and highpass filters I've seen in schematics have a resistor to ground). I'm guessing the resistance between base and emitter of Q1 plays the part of the resistor in the filter, ,am I right ?

Thanks again.
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Old 22nd June 2008, 03:26 PM   #4
impsick is offline impsick  United States
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you might be able to get away with .082uf if you have that value.
"Nothing happens for a reason. There are just reasons why things happen." Quote me on that.
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