C2, C6 and C8 are shown as 500uF. 1. The value is so high it will appear as a short at the signal frequencies and so reduce the gain of each stage effectively to zero. 2. There are no power supply decoupling capacitors. They are essential. At least 10uF across the supply and another 100nF shared between the supply to Q1, Q2 and Q3, Q4. 3. Try to keep a ground copper area on the top layer and all the tracking on the bottom layer to minimise unwanted signal and mains hum pickup. 4. Keep the layout tight and minimise signal track lengths for the same reason. 5. If you play about with the autorouter setup you may be able to get a good result but assuming you're using SMT components, the requirements placed by both 3 and 4 will be best achieved by hand routing. <br> <br>

what uF caps you recommend on C2, C6 and C8 Q1, Q2 and Q3, Q4 need 100nF on the 9v supply side

@killerkiwi96, "what uF caps you recommend on C2, C6 and C8..." Don't know because you have given no Design Requirements Specification or "How it works" documentation. (See: [https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a](https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a)) Why are they in the circuit? What purpose do they serve? For a circuit as simple as this, it's easy enough - and very instructive - to simulate the whole design and see how it really behaves then try out values for these caps. For more about decoupling see: [https://easyeda.com/forum/topic/UPDATED-Power-supply-decoupling-and-why-it-matters-30a39d0a77f34d5d8dc77e37c035b3d3](https://easyeda.com/forum/topic/UPDATED-Power-supply-decoupling-and-why-it-matters-30a39d0a77f34d5d8dc77e37c035b3d3)

R3, R10 and R13 look way too high and in stages with collector to base negative feedback, probably should not be there anyway. Simulation or a detailed mathematical design analysis is needed to assess. And some info about what the circuit is expected to do. :)

I would imagine they were originally 470pF or something like this in whatever circuit you based this upon.

@MikeDB i found this seems old tho 

@andyfierman its to change how a electric guitar sounds basically amp of sorts all it dose change the tone of the guitar

im trying make a effect know one have as im trying make my one sound like (Pink Floyd David Gilmore) AC/DC ect

@killerkiwi96, So update your schematic so that the passive component values match those in your image. Use the more readily available standard value of 470pF instead of 500pF. There are hundreds of different designs for sustain/fuzz pedals. Many of them are discrete component designs from long before the days of ICs. This one is simple and cheap enough so give it a try. You might also like: [https://easyeda\.com/example/Tesseract\_Guitar\_Practice\_Amp\-MjP71jBni](https://easyeda.com/example/Tesseract_Guitar_Practice_Amp-MjP71jBni)<br> <br> and: [https://easyeda\.com/example/Origami\_a\_collection\_of\_guitar\_effects\_\-JFa4mEWe8](https://easyeda.com/example/Origami_a_collection_of_guitar_effects_-JFa4mEWe8)<br> <br> :)

This gives some background on your circuit: [http://www\.bigmuffpage\.com/Big\_Muff\_Pi\_versions\_schematics\_part1\.html](http://www.bigmuffpage.com/Big_Muff_Pi_versions_schematics_part1.html)

thanks bug that a lot of help

thanks bud that a lot of help