'LIGHTWAH'

deadastronaut · April 14, 2011, 09:08:12 AM

ok..the penny just dropped!.

..as arph said a while ago..

why not use a quad op amp tl074, 1 for wah, 2 for lfo...what could the other opamp be usefull for?..

suggestions..!!!!...seems a waste of 1 op amp...

bearing in mind this is in the front of a chain...like a normal wah!...hmmm...

and also bearing in mind, to me it would be a @#$%ing nightmare to do a pcb layout... $:-\$

just thinking aloud!...

nordine · April 14, 2011, 09:27:09 AM

id use at the end of the chain

well that opamp cuold be used, i think, as ...

an opamp w/optocoupler in the feedback loop to make for a switchable tremolo
or
a 2nd LFO that modulates the original LFO
or
a little distortion module, so the pedal would already have the wah+disto pack
or
to replace the NPN if it doesn't achieve the full range of the wah travelling (or to replace it anyways

)
or
to make an envelope follower

B Tremblay · April 14, 2011, 10:02:23 AM

Quote from: deadastronaut on April 14, 2011, 09:08:12 AM
ok..the penny just dropped!. ..as arph said a while ago..

why not use a quad op amp tl074, 1 for wah, 2 for lfo...what could the other opamp be usefull for?..

suggestions..!!!!...seems a waste of 1 op amp...

bearing in mind this is in the front of a chain...like a normal wah!...hmmm...

and also bearing in mind, to me it would be a @#$%ing nightmare to do a pcb layout... $:-\$

just thinking aloud!...

You may want to take another look at the Phozer.

~arph · April 14, 2011, 10:19:11 AM

Yes, as in: use that spare opamp for a second filter

arma61 · April 14, 2011, 10:38:35 AM

Beware noob selfthinking ahead

add another LFO... playing with it just now... it's a little bit boring that wah wah wah wah "on time" like a methronome!.... may be a RND LFO, is that even possible ?, just to enter in the middle of the fading out? hope this is clear, a sort of "reprise"... befere le LED dim it brings the LED again to full light!

Rob, it's a Proel Wah, made in Italy, it's inductorless, so it could be a copy/clone/similar of either a Morley or Colorsound

deadastronaut · April 14, 2011, 10:49:55 AM

@all , great suggestions guys..

@arph, what another wah?..

@armando, yeah could be tedious, but it has the option of a fixed wah too, which i like, it has that nice sustain you get with a wah half on..i like that!..very sustainy..

and of course the depth conbtrol on the pulsing wah too...nice for clean or dirt..

maybe another thicker wah would be cool, or another lfo...hmmmm.. choices...

just what exactly would an ' envelope follower' do to this?..sorry for dumbass question?..

~arph · April 14, 2011, 11:35:34 AM

Quote from: deadastronaut on April 14, 2011, 10:49:55 AM
@arph, what another wah?..

Look at the phozer

deadastronaut · April 14, 2011, 11:48:19 AM

aha....yeah looks and sounds cool. 2 wahs set at different freq's.......i like the 'phaze' sound too...nice.

using 2 tl072's...hmmm....i feel a breadboarding session coming on....

what are the 2 switches doing?...

scratch that!....gotcha!.

ok i'll try those 2 wahs out, and use this lfo i have breaded at the moment...but that lfo does sound smooth,

nice one b tremblay..

be interesting to have seperate resonance pots to see how that sounds too...hmmm...

artifus · April 14, 2011, 12:13:31 PM

envelope follower could interrupt/over power lfo to led so each note/chord would trigger an extreme that faded to lfo rate... if you see what i'm trying to say... or trigger a separate led/ldr to control lfo rate or resonance...

*edit* or all of the above via switches

deadastronaut · April 14, 2011, 12:23:14 PM

erm.....i sort of get ya...

artifus · April 14, 2011, 12:33:21 PM

sorry... brain no work well today... you could bread board a mock up with your 386 sound to light - have that shine on an ldr across your 555 rate pot or on to the wah freq pot or both. hope that makes a bit more sense. need sleep...

deadastronaut · April 14, 2011, 12:38:20 PM

ahhhh yes, gotcha, in laymans terms....

cheers guys, its hard being dumb...i appreciate your patience!..

deadastronaut · April 27, 2011, 09:30:52 AM

right guys i'm back....

heres a different setup, i butchered/bastardized the 'phozer' and used just the 1 wah and tinkered with it a little..with a different lfo....schematic soon...

its a nicer thicker wah, with a longer sweep on the lfo...and some crazy fast sounds that go into the realms of the bizarre....

there is no depth control on this clip...yet!..

.. i like it...a lot...very addictive when soloing/noodling...

i just need to sort it out when its clean as there is a little dirt on it...

http://dl.dropbox.com/u/7464107/pulsewah%7E2.mp3

deadastronaut · April 27, 2011, 10:13:32 AM

ok i stiil have one half of a tl072 left over...seems a shame to waste it...

i'll look around.. but if anyone has any ideas/examples of something to add using 1 opamp then shoot!...

~arph · April 27, 2011, 10:26:21 AM

Could be the cliip, but I like the sound of the other one better, this one has way too much high frequencies. Reminds me of that horrible malmsteen sound $:-\$
Sounds like the lfo is not quite symmetrical either.

deadastronaut · April 27, 2011, 10:31:38 AM

hmmm....

yeah i found most of the lfo's i tried to be : led on, more than off...unequal....hmmm....

(i'm just going through my stereo)

~arph · April 27, 2011, 10:41:22 AM

You could shift the center frequency of the wah down a bit, so the max freq. is a bit lower.

deadastronaut · April 27, 2011, 10:50:34 AM

would that be in the 't' section i guess!...

i have 2 x 82k's..

and a 10nf and 4.7nf in the 'T'....

~arph · April 27, 2011, 11:01:09 AM

Yes, that would be tweaking the T, try increasing the caps a bit.

deadastronaut · April 27, 2011, 11:31:55 AM

yep, will do...

found the culprit...check out the 'phozer' its the 100nf and the 39k that come off the 75k's...thats defining the hi/lo too...

ive used 82k's...

on the (leftwah) t section its 2x10nf's...doesnt this make 5nf really, if i remember correctly..?

News:

'LIGHTWAH'