I've recently built a couple of dirtbaby delays and wanted to add a tone control for darker repeats at longer delay times. I tried replacing C13 (from the 2015 build document) http://www.madbeanpedals.com/projects/Dirtbaby/Dirtbaby2015.pdf with a much higher value and a pot between the capacitor and ground. It works like I was hoping but unfortunately I am getting distortion on the repeats when the repeats are darker. Is there a different capacitor that I could have replaced or a better way to add a tone control?
Thanks!
In mine I just put an on-off-on switch to add caps in parallel with C10. Can't remember exactly, but it must've been like 1n and 2n2, or 1n5 and 3n3. It's definitely dark with a 2n2 in parallel with C10.
You could also try to adapt Wampler's tone control (see the schematic in the Etcher's Paradise). But a simple toggle switch works really well for me.
Thanks for the help!
I looked for the tone control in the etcher's paradise but didn't see anything. Ideally I would like to have a tone pot to fine tune the EQ and because I already have an enclosure drilled for a pot. I was trying to add a tone control similar to the one in the De Profundis delay http://www.grindcustomsfx.com/wp-content/uploads/2017/05/DeProfundis.pdf and it works great except for the clipping.
Oh yeah sorry I meant from the Wampler Faux Analog Echo : http://www.madbeanpedals.com/EP/schematics/Leviathan.gif
I don't know where the clipping you hear comes from... Let us know what works best for you!
C29 is a good spot to darken the repeats up. Add a second 47n cap at the junction of R30/C29. Wire the other end of the cap to lug3 of a 25k pot and the wiper of that pot to ground. As you turn the pot up the two 47n caps blend in parallel and then you get darker repeats. You will have to turn the FDBK pot up more when you darken the repeats.
I tried adding a capacitor between R30 and C29 and it did darken the repeats but not the first one. I'm thinking if I want the first repeat do be darker, I could increase the value of C8 but each repeat would not get darker than the previous. Could anyone explain why the signal clips when increasing C13? Is it because more bass is let through which then increases the outup? Is there something else I can change to keep the tone control in that spot?
Thanks!
I now have it to where I am satisfied. I increases R13 and that took care of the clipping.