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|8/26/1998 3:16 AM|
||Wah pedal circuits|
Does anyone have a circuit for a wah pedal
that does not involve a 500mH inductor?
I have managed to find about five that
do involve this part, which I can source
but it would take two weeks and cost me
a total of $US20 to have it delivered to
I built one circuit using a design from a book
which sounded lame (filter parameters all wrong). If anyone has a halfway
decent schematic for a wah pedal based on
an active filter instead of an inductor,
I'd be very grateful. My email address is:
|8/26/1998 6:26 AM|
Try Stellans site. He has a section for his home build rack. In this rack is a VCF.
As Stellan says "you can wah your brains out". There is a schematic and a sound sample too. Nice sound I think.
Regards, and happy building.
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|8/27/1998 5:45 AM|
Hamish, seeing you are in NZ, the latest copy of Silicon Chip mag (sept 98) has a wah as its lead (no pun intended) article. Uses a 4046 as a voltage controlled oscillator, which goes to a MF5CN switched capacitor filter. Nary an inductor to be seen. A good feature is that the Q of the filter can be tweaked by the ratio of 2 resistors.
The only unfortunate thing is their plans for a pedal assembly, with a metal plate scraping around and forcing a linear pot back and foward. Yeah, right, OK for an hour maybe.
Use a linear hall efect device & a magnet.
The UGN3503 is easy to get, it's used in the gear change indicator elsewhere in this issue.
|8/27/1998 5:58 AM|
Another approach is that in one of Penfold's books of guitar effects, "Advanced Projects for Electric Guitar"ISBN 0.85934.380.4 where a hall effect device UGN3503U (Ungar) changes the apparent resistance of a fet.
|8/27/1998 4:17 PM|
Thanks - it's ironic, that the magazine is
on the newsstands while I am searching the
internet for a circuit. Anyway, I build the
wah out of the first Penfold guitar FX books
and it sounds horrible. FWIW I am using an
old Vox volume pedal as the mechanism.
A hall effect sensor would be better, but
I am halfway through building the wah from
Stallan's (sp?) site. Thanks for the leads
though, I have another wah to build for
someone else and I might try one of those
|8/28/1998 6:20 AM|
Thanks for telling us the Penfold wah sounds shitful. Mr Penfold has done some terrible things, notably his book on building your own analog synth, almost every ckt has a fatal error just for starters! Be sure to let us know how Stellan's one goes
|8/31/1998 4:46 AM|
I may have to reserve that opinion against
the Penfold wah. When I was dismantling it
for parts to make Stellan's wah I discovered
I had not soldered a joint on one of the
resistors that is used to bias the input
signal to one of the opamp stages, since
the circuit does not have a -ve. Also,
I found the cct you mentioned that uses the
hall effect device. (Almost finished the
new Wah, has the disadvantage of running
two 9V batteries, my design expertise does
not extend to changing that).
I have an original Vox volume pedal. I'm
thinking of using it as a template and
casting some copies in aluminium, to use
as volume/wah/whatever. That might
be a few months from now, if anyone is
interested feel free to email me.
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