help in changing cap values for a disto stompbox

pinkanarchy · 21st June 2008, 05:47 PM

Hi,

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

I'm building this:

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.

Nordic · 22nd June 2008, 08:09 AM

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

pinkanarchy · 22nd June 2008, 02:44 PM

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.

impsick · 22nd June 2008, 03:26 PM

you might be able to get away with .082uf if you have that value.

21st June 2008, 05:47 PM	#1
pinkanarchy diyAudio Member Join Date: Feb 2008	help in changing cap values for a disto stompbox Hi, I hope this is the right forum to post, if not just tell me. I'm building this: 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.

22nd June 2008, 03:26 PM	#4
impsick diyAudio Member Join Date: Dec 2006 Location: Huntington Beach, Ca	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. http://stores.ebay.com/AudioGrade?_rdc=1

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22nd June 2008, 08:09 AM	#2
Nordic diyAudio Member Join Date: Sep 2005	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

22nd June 2008, 02:44 PM	#3
pinkanarchy diyAudio Member Join Date: Feb 2008	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.