I've recently bought a breadboard ( finally ). I always wanted to have wahwah pedal but it's too expensive to buy original ones. I breadboarded inductorless wah by beavis audio (http://www.beavisaudio.com/Projects/ColorsoundWah/index.htm (http://www.beavisaudio.com/Projects/ColorsoundWah/index.htm)).
It sounds good but I wasn't satisfied. My mods:
1. To increase the level of pedal I changed 330Kohm resistor to 100K. I removed 47kohm, 100Kohm and 2.2nF in main signal path. It just changed into a simple booster.
2. Some people on this forum said that it will be better to make both capacitors in bottom T part equal. So I made both 2.2nF.
3. According to some other schematics, I have changed 33Kohm resistor before wah pot to 360ohm.
4. Changed 15nF to 6.8nF. Sounds better. In next week I will try with other values from 2.2nF to 27nF.
Now my schematic:
http://www.mediafire.com/view/5j5dx58c1dsoj8j/wah_schematic.jpg (http://www.mediafire.com/view/5j5dx58c1dsoj8j/wah_schematic.jpg)
I will include the soundclips later. ;)
Gasmask
Soundclip (I haven't got enclosure for this pedal so I change position of wahpot with my hand) : http://www.mediafire.com/listen/lvffhdl1m9duhzv/inductorless_wah.mp3
sounds good
i like the sound of it!
i was also advised to keep the two caps equal value. perhaps from a pure mathematical perspective this is true, but my ears told me that i liked a mismatch there.
here are 3, two are mine and the idiot wah that i based lefty idiot wah on. the freeper seemed to work better in front of fuzz as i recall. note the mismatch caps on the T on the lefty.
(http://juansolo.demon.co.uk/stompage/schematics/Torchy%27s%20Veros/Circuit_Snippets/Tim%20E%20Idiot%20Wah/idiotwah_sch.gif)
(http://img.photobucket.com/albums/v311/joegagan/schems/LeftyIdiotWah_zps39e28dcf.gif)
(http://img.photobucket.com/albums/v311/joegagan/schems/WahFreeper_zps703d0d34.gif)
Hallo, I jump in with some questions about this circuits:
I always had luck with the idiot wah, adapted a little of course, my preference is for matched caps in the t network btw;
I don't hear much difference adding a second t network like in the colorsound.... maybe it's just that I did not try it at high volume?
I will give a go to the freeper.
hi allesz, let us know how it goes! yes, i posted all 3 to give ideas about different ways to go.
i did pot replace on a colorsound reissue ( 90s, inductorless) - sounded awesome!
******* youtube embed not working***
https://www.youtube.com/watch?v=REpvoPhZTGg
I posted a LTSpice simulation in the Spice board.
http://www.diystompboxes.com/smfforum/index.php?topic=99448.0
I'd change the 15n cap (in series with the 33k) to 22n - 33n to make the curves of the same height... that if you don't want a bump near the lows.
Useful range is about 33k - 47k or less, so rotating a 100k linear pot 90 degrees should work.
R8 is not 33k but 470 ohm.
If you make both caps equal try 4n7, 3n3. 2n2 might sound too trebly.
mac
Quote from: joegagan on May 28, 2014, 05:12:19 PM******* youtube embed not working***
it is working -
but for some reason only with
HTTP (Hypertext Transfer Protocol) but not
HTTPS (Hypertext Transfer Protocol Secure)
when you are copying link from youtube the addres is
https://www.youtube.com/watch?v=.... - just change it to
http://www.youtube.com/watch?v=.... and you're done
thanks for that - i tried goofing wiht it, i am glad you figured it out. thanks for posting. now for some gratuitous wah pot porn. ( same wah as the one in video)
(https://scontent-a-lax.xx.fbcdn.net/hphotos-xpa1/t1.0-9/1622256_654286704631411_560724971_n.jpg)
(https://scontent-a-lax.xx.fbcdn.net/hphotos-xfa1/t1.0-9/1782136_654286961298052_1195494869_n.jpg)