AMZ FX ANALOG ALCHEMY GEOFX MEF ROG MEF DIY WIKI

is there any auto wah without LDR/LED thing?

Started by vendettav, May 04, 2011, 04:18:28 PM

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vendettav

May 04, 2011, 04:18:28 PM
just to be simple-ish :)
check my music HERE

Shredtastic psycho metal!

Govmnt_Lacky

#1
May 04, 2011, 04:32:01 PM
MXR Envelope Filter  ;D

http://www.tonepad.com/project.asp?id=4

OR

http://www.generalguitargadgets.com/projects/19-filters-envelope/113-mxr-ef

There are others. The internet is your friend (Google, Yahoo, etc.)

Good Luck  ;D
A Veteran is someone who, at one point in his or her life, wrote a blank check made payable to The United States of America
for an amount of 'up to and including my life.'

Mark Hammer

#2
May 04, 2011, 04:37:05 PM
Quote from: Govmnt_Lacky on May 04, 2011, 04:32:01 PM
MXR Envelope Filter  ;D
One of my all-time favourites.

Hard to get more classic than the EHX Dr. Q.  In fact I'm having a hard time thinking of any EHX auto-wah that uses an LED/LDR combination, though doubtless I am forgetting one that someone will remind me of.

The DOD FX-25 uses an OTA-based filter, as does the Mu-Tron V, and the EHX Y-triggered Filter.

So, yeah, LED/LDR combinations are not absolutely essential to auto-wahs....though I have to admit they can have a more desirable sound because they are less susceptible to the ripple or "trill" during the decay portion of the sweep.  But, if you set the decay to be fast, there is little audible difference in tonal quality.

twabelljr

#3
May 04, 2011, 06:31:41 PM
http://www.home-wrecker.com/nurse-quacky.html

Very simple. Reference links included and a perboard layout. Mods available too. Check Mark Hammer's link. Attack pot can be left out and switchable selections added, lots of others. Very fun.
Shine On !!!

R.G.

#4
May 04, 2011, 08:43:56 PM
A single LM13700 can implement a state-variable filter similar to the Mutron. Other stuff will need to go around it, of course, but it's doable.
R.G.

In response to the questions in the forum - PCB Layout for Musical Effects is available from The Book Patch. Search "PCB Layout" and it ought to appear.

Mark Hammer

#5
May 04, 2011, 09:05:59 PM
I rigged up a DOD FX-25, which uses an LM13600 and is normally a bandpass filter, as a lowpass.  So there's two out of the 3 usual filter types on a Mutron.

Earthscum

#6
May 04, 2011, 11:40:13 PM
In my DOD FX17 I figured out that swapping the output from the LM13600 changed from bandpass to lowpass, and if I remember right, taking from the bandpass output, and removing the feedback resistor in that section resulted in the high-pass mode. I just hardwired it in lowpass (removed the resistor and soldered it to the trace side of the board). So you can basically get all 3 from that circuit with a bit of switching trickery.
Give a man Fuzz, and he'll jam for a day... teach a man how to make a Fuzz and he'll never jam again!

http://www.facebook.com/Earthscum

R.G.

#7
May 05, 2011, 12:08:23 AM
The state variable filter lets you have bandpass, high pass, low pass and notch filters all simultaneously.

"OTA State Variable Filter" makes a great google search.
R.G.

In response to the questions in the forum - PCB Layout for Musical Effects is available from The Book Patch. Search "PCB Layout" and it ought to appear.

vendettav

#8
May 05, 2011, 04:27:30 AM
that nurse quacky sounds quite good and seems to be easy to get the parts of! the only doubt is the LM358 which the local stores won't carry but i'll ask or order it sometimes when im doing an online order :)
I'd so build a FX25 (B) that's like one of my fav effects but the schem seems to be a kinda complicated build

anyways, i see all the stuff suggested are envelope filters, what i was originally thinking was a LFO controlled wah. how would one go with wiring a LFO to a wah without LDR/LED? I'm quite new to the whole LFO - schematic thing so hope to get into it with this plan :)
check my music HERE

Shredtastic psycho metal!

deadastronaut

#9
May 05, 2011, 04:45:11 AM
Quote from: vendettav on May 05, 2011, 04:27:30 AM
how would one go with wiring a LFO to a wah without LDR/LED?

hmm.. been working on this..a lot.....whats wrong with led/ldr?....

i have mine on breadboard at the moment...and sounds great...very smooth...

i built the nurse quacky a long time ago..but it didnt quack enough to my taste... :)
https://www.youtube.com/user/100roberthenry
https://deadastronaut.wixsite.com/effects

chasm reverb/tremshifter/faze filter/abductor II delay/timestream reverb/dreamtime delay/skinwalker hi gain dist/black triangle OD/ nano drums/space patrol fuzz//

~arph

#10
May 05, 2011, 04:55:37 AM Last Edit: May 05, 2011, 04:57:15 AM by ~arph
Check out the snow white autowah, madbean has a board for it too.. EDIT: can't find it

cpm

#11
May 05, 2011, 04:57:51 AM
Quote from: R.G. on May 05, 2011, 12:08:23 AM
The state variable filter lets you have bandpass, high pass, low pass and notch filters all simultaneously.

"OTA State Variable Filter" makes a great google search.

thats a promising project i'd like to try, now that i have the OTAs out on the bech

tha hard part with them is taming the noise, ugh!!

vendettav

#12
May 05, 2011, 09:06:50 AM
Quote from: deadastronaut on May 05, 2011, 04:45:11 AM
Quote from: vendettav on May 05, 2011, 04:27:30 AM
how would one go with wiring a LFO to a wah without LDR/LED?

hmm.. been working on this..a lot.....whats wrong with led/ldr?....

i have mine on breadboard at the moment...and sounds great...very smooth...

i built the nurse quacky a long time ago..but it didnt quack enough to my taste... :)
]

yeah i actually got nothing against them, and i agree they sound smooth. I have a LED/LDR based Morley PWA (they're all like that  :P ) and i love it more than any crybaby or vox :) now the thing is I can't get a LDR nor an optoisolator >_< otherwise i get a lot of ideas where i could have put a LFO with an LDR!! oooh so want one. i guess i'll order some ... in awhile but for now...
check my music HERE

Shredtastic psycho metal!

Mark Hammer

#13
May 05, 2011, 09:13:43 AM
One of the nice things about LDRs is that you can't distort them, and they tend to demand less out of the rectifier/follower stage in order to keep objectionable ripple at a minimum.  And because of that, filter designs that use an LDR to vary frequency are often: a) smoother sounding (low ripple), and b) quieter (because the signal does not have tobe attenuated for a JFET or OTA and then boosted again to bring the level up).

deadastronaut

#14
May 05, 2011, 09:16:49 AM
https://www.youtube.com/user/100roberthenry
https://deadastronaut.wixsite.com/effects

chasm reverb/tremshifter/faze filter/abductor II delay/timestream reverb/dreamtime delay/skinwalker hi gain dist/black triangle OD/ nano drums/space patrol fuzz//

vendettav

#15
May 05, 2011, 11:22:52 AM
how about TAYDA?
they'ev got optoisolators, which would be the best pick?
http://www.taydaelectronics.com/servlet/the-%28-IC-%29-Integrated-Circuits-cln-Optoisolators/Categories


and i geuss they dont have any photoresistors cause i can't find any :(
check my music HERE

Shredtastic psycho metal!

deadastronaut

#16
May 05, 2011, 11:56:31 AM
ive never used the optocouplers.../ isolators...

i like to be able to see the light pulse...and vary the brightness etc...

might try one one day though...
https://www.youtube.com/user/100roberthenry
https://deadastronaut.wixsite.com/effects

chasm reverb/tremshifter/faze filter/abductor II delay/timestream reverb/dreamtime delay/skinwalker hi gain dist/black triangle OD/ nano drums/space patrol fuzz//

vendettav

#17
May 05, 2011, 12:30:35 PM
hmm yeah the kinesthetics make some difference.. guses i'll have to do a little of searchign before ordering an optocoupler
check my music HERE

Shredtastic psycho metal!

Hides-His-Eyes

#18
May 05, 2011, 02:01:11 PM
Quote from: vendettav on May 05, 2011, 11:22:52 AM
how about TAYDA?
they'ev got optoisolators, which would be the best pick?
http://www.taydaelectronics.com/servlet/the-%28-IC-%29-Integrated-Circuits-cln-Optoisolators/Categories


and i geuss they dont have any photoresistors cause i can't find any :(


Not suitable. You need VTL5C# or NSL-32.

vendettav

#19
May 05, 2011, 02:22:07 PM
Quote from: Hides-His-Eyes on May 05, 2011, 02:01:11 PM
Quote from: vendettav on May 05, 2011, 11:22:52 AM
how about TAYDA?
they'ev got optoisolators, which would be the best pick?
http://www.taydaelectronics.com/servlet/the-%28-IC-%29-Integrated-Circuits-cln-Optoisolators/Categories


and i geuss they dont have any photoresistors cause i can't find any :(


Not suitable. You need VTL5C# or NSL-32.
sux! so i guess LDR is the way... anyways...

hmm anyways how do you hook the LFO up to the schematic? LDR/LED; optoisolators are the only options?
check my music HERE

Shredtastic psycho metal!
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