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DIYstompboxes.com  |  DIY Stompboxes  |  Building your own stompbox  |  'LIGHTWAH' 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: 'LIGHTWAH'  (Read 78592 times)
vendettav
Posts: 748


The Paperface (call me V)


WWW
Re: 'LIGHTWAH'
« Reply #440 on: July 23, 2011, 05:13:25 AM »

Rob, dammit i'm also experiencing issues.
I just built the dark light bit. 2 working LEDs a 2n3904 (checked the pinout thrice) a pot and a LDR. the LDR is working on it's own, changing the resistance. ut in the schematic it doesnt do anything at all
are you sure you did it this way cause i understand the concept behind this but the fact that there is a already a connection between the pot's lug 1 and base of the tranny, an additional resistance parallel to the one from the pot's lug is just pointless. ive tried bunch of combinations and still cant get it work (i got it responding on one but the LEDs would go dark when i'd darken the LDR (as if cut the light from it) but it's not how it's supposed to funcion right?

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vendettav
Posts: 748


The Paperface (call me V)


WWW
Re: 'LIGHTWAH'
« Reply #441 on: July 23, 2011, 05:41:53 AM »

ok an update here

I did some research and found this http://www.kpsec.freeuk.com/trancirc.htm
go down til the end and scroll up a bit it says 'Using a transistor switch with sensors'
now see the schematic, i did the LDR birght = LED bright one and it works
the other one doesnt want to work with me for some reason!
what the ...
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Shredtastic psycho metal!
mattthegamer463
Posts: 398


Re: 'LIGHTWAH'
« Reply #442 on: July 23, 2011, 11:15:34 AM »

ok an update here

I did some research and found this http://www.kpsec.freeuk.com/trancirc.htm
go down til the end and scroll up a bit it says 'Using a transistor switch with sensors'
now see the schematic, i did the LDR birght = LED bright one and it works
the other one doesnt want to work with me for some reason!
what the ...

The sensitivity pot in rob's circuit is in parallel with the LDR, maybe it is causing the LDR resistance changes to become negligible compared to the 10k pot value.  10k in parallel with 1M is not much different than 10k in parallel with 100k, etc.  Maybe thats the issue.  I'm concerned that much of this circuit's success is dependent of the light/dark resistances of the LDR.
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vendettav
Posts: 748


The Paperface (call me V)


WWW
Re: 'LIGHTWAH'
« Reply #443 on: July 23, 2011, 12:47:43 PM »

ok an update here

I did some research and found this http://www.kpsec.freeuk.com/trancirc.htm
go down til the end and scroll up a bit it says 'Using a transistor switch with sensors'
now see the schematic, i did the LDR birght = LED bright one and it works
the other one doesnt want to work with me for some reason!
what the ...

The sensitivity pot in rob's circuit is in parallel with the LDR, maybe it is causing the LDR resistance changes to become negligible compared to the 10k pot value.  10k in parallel with 1M is not much different than 10k in parallel with 100k, etc.  Maybe thats the issue.  I'm concerned that much of this circuit's success is dependent of the light/dark resistances of the LDR.

actualyl that's what i was trying to explain in my post

however hmm hey i get another idea how to wire this thing up, will try it asap and let you know guys
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Shredtastic psycho metal!
deadastronaut
Posts: 8764


Rob H. LONDON


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Re: 'LIGHTWAH'
« Reply #444 on: August 02, 2011, 10:26:57 AM »

yeah i know, yawn!......i built another 2 lightwahs...... icon_rolleyes









works fine!... Wink

tip. use low profile miniature electro's ...with the switch in the middle... Wink
« Last Edit: August 02, 2011, 10:28:47 AM by deadastronaut » Logged

nocentelli
Posts: 452


leo


Re: 'LIGHTWAH'
« Reply #445 on: August 02, 2011, 10:55:01 AM »

looks great, Rob. I'm still waiting for the b@sta@rd LDRs to arrive so I can build this.
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deadastronaut
Posts: 8764


Rob H. LONDON


WWW
Re: 'LIGHTWAH'
« Reply #446 on: August 02, 2011, 11:03:14 AM »

cheers man, yeah i hate waiting foir bits, but its nice when they arrive,...

ive whacked this into my little roland micro cube and it kicks serious butt...sounds great...proper icon_twisted

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nexekho
Posts: 374


Re: 'LIGHTWAH'
« Reply #447 on: August 03, 2011, 02:16:11 PM »

I love it!  Want to build something functionally similar, but simpler.

My signal chain is almost all-digital and quite hot with a lot of volume headroom.  (I run my POD at ~30% volume)  Do you think it might be feasible to build a passive wah?  As far as I can tell, a wah is basically an adjustable bandpass, filtering out everything outside a certain range, am I right?  If I built a passive bandpass filter with the right values, could it be LDR-controlled by putting the LDRs in series with the resistors?
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kinski
Posts: 37


Re: 'LIGHTWAH'
« Reply #448 on: August 06, 2011, 08:54:46 PM »

So I built this pedal a while back. Sounds great! However, I was wondering, would it be possible to add an expression jack, so I could use and expression pedal to control the manual wah? I guess at that point, I could just build a true wah pedal, but I'd still like to know if this would be possible.

Thanks for the help, and sorry if this was mention already in this thread. I tried to sift through to see, but its pretty long and may have missed it.
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cab42
Posts: 469

Carsten B. CPH, Denmark


Re: 'LIGHTWAH'
« Reply #449 on: August 07, 2011, 03:05:06 AM »

So I built this pedal a while back. Sounds great! However, I was wondering, would it be possible to add an expression jack, so I could use and expression pedal to control the manual wah? I guess at that point, I could just build a true wah pedal, but I'd still like to know if this would be possible.

Thanks for the help, and sorry if this was mention already in this thread. I tried to sift through to see, but its pretty long and may have missed it.

You could add a three way switch instead of the present switch and route the wire to a mono jack. Or alternatively use a switching jack that cuts the connection to the switch. At least that was how I thought about doing it.

I was thinking about building the thing into a wah shell, and leave out the sensor part. I'm fairly sure that I'm not able to stand on one leg, waving my foot in the the air and play guitar at the same time without some yoga training.

Regards

Carsten
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Gurner
Posts: 1314


Re: 'LIGHTWAH'
« Reply #450 on: August 07, 2011, 06:19:07 AM »

Or alternatively use a switching jack that cuts the connection to the switch. At least that was how I thought about doing it.

I reckon that's the way to go...just find a pot that matches the dark resistance of the LDR.

Anyone considered a ldr (on a socket/jack)...long lined up a mic stand taped to the top for cool mouth wah?!
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kinski
Posts: 37


Re: 'LIGHTWAH'
« Reply #451 on: August 07, 2011, 09:42:36 AM »

Very cool. Thanks! I'll see what I can do.
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deadastronaut
Posts: 8764


Rob H. LONDON


WWW
Re: 'LIGHTWAH'
« Reply #452 on: August 08, 2011, 01:20:56 AM »

So I built this pedal a while back. Sounds great! However, I was wondering, would it be possible to add an expression jack, so I could use and expression pedal to control the manual wah? I guess at that point, I could just build a true wah pedal, but I'd still like to know if this would be possible.

Thanks for the help, and sorry if this was mention already in this thread. I tried to sift through to see, but its pretty long and may have missed it.

 I'm fairly sure that I'm not able to stand on one leg, waving my foot in the the air and play guitar at the same time without some yoga training.

Regards

Carsten

get another leg... Wink

but seriously, i thought about the expression a while back, good idea,...... if i were to build it in a wah shell, i would have switching between caps too...bright and normal etc...experiment with the 'T'.... Wink
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askwho69
Posts: 679



Re: 'LIGHTWAH'
« Reply #453 on: August 09, 2011, 12:06:26 PM »

Just Built it from 10:30 to 2am Cheesy i used perf and followed the pcb above.. its fricking hard man its so compacted! but focus is the only thing that makes my build 90percent working in first try! Cheesy i was experiencing the LDR foot sensor " the thing doesnt work" but when i read about dark/light resistance and measure a ldr that is 800k - 1M turned the sensor and  "boom" wah wah! it worked!

While doing the perf i forgot the c8 i installed 1 uf "damn" and i dont want to desolder my beautiful perf "i was trying to make like "FC" as clean as possible Smiley"
SO! i paralleled 10 uf instead and the effect is very cool my speed pot was 500k and c8 is 11uf im getting a slow speed and high speed that is usable and really kicks in when turning the pot ... another changes was the "TLE2072" superb IC i just replaced the TL072 and the beast becomes "beastiality " PLEASE TRY AND COMPARE TO HEAR THE DIFFERENCE" for me the pot speed becomes easy to dial and more speed and super slow speed Cheesy try it

By the way im sleepy dont mind my terms and wrong grammar im tired! need to wake up early hahahahha

this is a good night sleep!


THANK YOU ROB!


last question where can i install or insert a jack for manual wah? i have expression pedal laying around.. and also the pot value?

thanks once again!
« Last Edit: August 09, 2011, 12:10:37 PM by askwho69 » Logged

"To live is to die"
deadastronaut
Posts: 8764


Rob H. LONDON


WWW
Re: 'LIGHTWAH'
« Reply #454 on: August 09, 2011, 12:10:23 PM »

well done,..... on perf?..your brave ... Grin

glad you got it going man.......now have a good kip!..night night.... icon_wink
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askwho69
Posts: 679



Re: 'LIGHTWAH'
« Reply #455 on: August 09, 2011, 12:12:58 PM »

hahhaha Rob yah im so desperate to make one and for me making pcb is more job and hard work to me! hahaha glad i modify my post about expression pedal

anyone wants to perf it ? just follow the pcb and count the dots Cheesy hahahahha

Thanks again rob!
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"To live is to die"
Dork
Posts: 7


Re: 'LIGHTWAH'
« Reply #456 on: September 14, 2011, 11:38:10 PM »

Hi Guys!

So, this PCB is verified, right?
And C8 is 100ĩF and the speed Pot is 500K (470) lin?

I want this effect so bad, definately gonna make it asap! Many thanks Deadastronaut!


if anyone is remotely interested.... YAWN!... Wink

and fancies giving this a shot, heres the layout pdf, and pcb pdf ok....

ive made a pcb of it, (and one for armando icon_wink) but wont have time this weekend to build/verify  it....ive checked it over many times and it all looks ok...

i re-breaded the lfo especially, and it looks cool to me!...blood sweat and many tantrums  went into this @#$%er!!!!....but it looks ok now!... icon_wink

http://dl.dropbox.com/u/7464107/LIGHTWAHPCB2.pdf

http://dl.dropbox.com/u/7464107/lightwah%20layout.pdf

« Last Edit: September 14, 2011, 11:42:51 PM by Dork » Logged
deadastronaut
Posts: 8764


Rob H. LONDON


WWW
Re: 'LIGHTWAH'
« Reply #457 on: September 15, 2011, 12:25:16 AM »

hi dork,  glad you like it , i do a lot... C8 is a 10uf..ok...and pot is 470k lin. Wink

ive built a few so yep!..its very verified ok. Grin

i'm currently working on a lightwah+distortion+fuzz in a 1590d, basically metallica+hillage in a box.. icon_twisted

« Last Edit: September 15, 2011, 12:26:58 AM by deadastronaut » Logged

Dork
Posts: 7


Re: 'LIGHTWAH'
« Reply #458 on: September 15, 2011, 01:08:46 AM »

Thanks Robert for the fast reply!

I still have a few questions:

I canīt find the 9V spot, and two resistors have no values. I added a Picture, so you can see what I mean:


Are both trannys 2N3904īs ?

Thank you, I already etched the PCB, ready to start in a few days (I have to take a look, if I have enough LDRs @ home).

I canīt wait, to start. I finished my Snow white Auto wah a few days before, but your Lightwah is definately much more interesting!
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deadastronaut
Posts: 8764


Rob H. LONDON


WWW
Re: 'LIGHTWAH'
« Reply #459 on: September 15, 2011, 01:18:21 AM »

hi dork, i just updated the pdf, download it again its all ok now.....all corrected and those resistors have values on the layout too ok...

let us know how ya get on. good luck man. rob.

edit: yep thats the 9v... Wink

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