'LIGHTWAH'

[deadastronaut]

wow..squiggle..   amazing build man, love it...i like the idea of the led lamp too...cool...(could've dc socketed that )

as for lfo noise , i never encountered any noise with any of my builds, i went through various lfo's to make sure i didn't...hmmmmm...

i'll have a think on that...hmmm could it be to do with your 'eye' controlling the speed mod?....

[squigglefunk]

i'll have a think on that...hmmm could it be to do with your 'eye' controlling the speed mod?....

I am thinking that might be the case, I'm pretty it worked silently when used as built to the original specs, and it seemed to as well when the mod used its own photo eye...

I wanted to use one eye only for simplicity but I'll have to see how bad the ticking noise is in a gigging situation, if its unbearable then I'll look into using two eyes. its too much fun with the light controlled speed for the LFO. I just added an eye to the speed pot between the two connections and it gives a great range of speeds with the eye.

I love the idea of the dc jack for the light "antenna" and I actually have some of the ends here from another project... I might have to borrow that idea from ya, thanks

and again, thanks for the cool project

[deadastronaut]

no problem , your welcome..

i like the idea of the speed ldr..cool...

so you can switch that  speed ldr on/off then...is there any noise when its off?...

[squigglefunk]

http://www.youtube.com/watch?v=0Z4kngdG9Lo

here's a video, using the second footswitch to the right controls the changing from light wah to LFO wah. Then there's a secondary switch up by the LFO LED that will activate the eye for the LFO.

we'll see about the noise, last night it wasn't noticeable much at all 

all in all it seems to be working pretty well so far, enough for my own use for sure 

[deadastronaut]

nice one...the speed mod works well.....sounds great with the echobase too....cool...

i need new retinas though...    ... 

[squigglefunk]

lol, yeah the LEDs are especially bright with the way the cam recorded. it is a crappy camera. 

thanx again for the cool project

[LaceSensor]

etched and built this today....gotta say, this is an INCREDIBLY COOOOOOL pedal, majorly impressive

thanks for all the hard work and sharing of ideas.

Congratulations on a fantastic effect.

[deadastronaut]

yay!...nice one lace.....

[LaceSensor]

gonna have to tweak it a bit I think, worked better outside the box (the proximity wah that is)
I think I have gunked up the LDR supergluing it to the back on an LED offcut

[add4]

Hello all,
I tried breadboarding the lightwah light detecting section this morning, but i can't get the ld to light up.
I tried building the schematic circuit in the falstad applet, and it doesn't work too :
http://www.falstad.com/circuit/#%24+1+5.0E6+10.20027730826997+50+5.0+50%0AR+208+144+208+80+0+0+40.0+9.0+0.0+0.0+0.5%0A174+208+144+208+240+0+10000.0+0.9950000000000001+Resistance%0Ag+208+240+208+288+0%0At+240+192+288+192+0+1+-8.79861064618451+-2.1657500001714958E-8+880.0%0Aw+240+192+224+192+0%0Aw+288+208+288+224+0%0A174+288+224+288+288+0+500000.0+0.8663000000000001+Resistance%0Aw+288+288+240+288+0%0Aw+240+288+240+192+0%0Aw+288+176+288+144+0%0A162+288+112+288+144+1+2.1024259+1.0+0.0+0.0%0Aw+288+112+240+112+0%0Aw+240+112+240+144+0%0Aw+240+144+208+144+0%0Aw+304+256+304+288+0%0Aw+304+288+288+288+0%0A

I modeled the LDR with a potentiometer, I think that should be ok, right?
I tried all values of beta (tranny), and combinations or resistances, i can't get the LED to light up, what am i not getting?
Also, I would have added a resistor between the led and the tranny to generate  a current and protect the LED.

Anyway, I don't get why everybody has their fully pedal working while i can't get this simple snippet to work :p

I tried playing with the other circuits shown at the end of the page here : http://www.kpsec.freeuk.com/trancirc.htm and this works, even if the range of the LDR pot is really limited (LED lights up very fast, then stays fully turned on, might not be practical in real world use)

Also, how accurate is this applet? the more i play with it, the more i realize my intuition in electronics is to be developed! ^^

[add4]

So, i made a backward search into the thread looking for the last schematic i could find and it turns out that the last one, posted by deadastronaut, had a connection to ground between the emitter and the LDR. That connection was missing in my version of the schematic. Tested it on java, breadboarded it, works perfectly!

The schematic that i used is quoted in this message. I only tested the footldr part of the schematic so far.
My LDR are pretty crappy: a few ohms when lighted, 35k when no light touch them. Still the sensitivity pot allows to make it work. I would be curious to know if a larger range LDR would not allow more flexibility in the sensitive setting, and a larger range of detection.
In my build, the sensitivity pot has to be fine tuned to be into the "led off-led almost-fully-on" range. And then i have to go pretty close to the LDR to make the change happen.
I thikn that's an issue with the LDR range but that's the only ones i could find locally. I'll have to order some.

Anyway, i hope that can help the people who had problems with the footldr part.
Peace,

they are 1M - ?..cant remember off hand...but definately 1M.....

your best bet is to check the schematic alongside the layout i did...as that works perfectly for sure!...just to be safe!. laborious i know, but it has to be right!...


is the wah working ok..is the light sensor part getting brighter as you cover the ldr?...

turn the sensor pot so the led is just off....then when you cover the ldr it should gradualy be on...

heres the sections of it if it helps ya ok...

[deadastronaut]

@weu weii weii... yep get a larger ldr resistance that'll be much better..

i never tried anything more than 1m-ish..as thats what i had to hand really, .it'll be interesting to see how.. a much higher oner behaves..

glad you got it going!..

[joethugs]

just remember i updated the pdf so C8 is a 10uf....ok all the best rob.

hi! just a question would the update be for like polarity protection of some sort? is the updated pdf already up for download? again many thanks to sir rob for this cool pedal..

[nexekho]

In the above schematic, should the sensitivity 470k in the bottom left be marked rate for the inbuilt LFO?  If not, how is the rate set?

[deadastronaut]

@joe, no polarity protection, i was just re-affirming the C8 is a 10uf...

here is the 'corrected layout ok.in the reply....
http://www.diystompboxes.com/smfforum/index.php?topic=88582.msg807440#msg807440

@james, yep its a 470k pot....its just the bad way the text was laid out...

[joethugs]

hmm.. second opamp not used? maybe a booster ala morley mark1..

[deadastronaut]

i originally designed it for tl071...and then converted for tl072, just because people are more likely to have them in their bits boxes.....

i did oy with the idea of a envelope detector, but never got round to it....i might one day..

[threepwood]

What an amazing pedal.  Hats off to you Mr Astronaut.
This is DEFINITELY my next build.  I'm pretty new to building pedals and was hoping someone would be kind enough to provide a full wiring diagram with the footwitch, DC, input/output jacks etc included?
I know that it's a pretty big ask but I would be eternally greatful if someone could have a go at drawing it up.  I'm sure there's mre people than me who would benefit.
Great work!

[deadastronaut]

What an amazing pedal.  Hats off to you Mr Astronaut.
This is DEFINITELY my next build.  I'm pretty new to building pedals and was hoping someone would be kind enough to provide a full wiring diagram with the footwitch, DC, input/output jacks etc included?
I know that it's a pretty big ask but I would be eternally greatful if someone could have a go at drawing it up.  I'm sure there's mre people than me who would benefit.
Great work!

ok, heres a diagram and switch wiring tutorial...from gaussmarkov, (bookmark it ) i use this all the time...and saves me doing stuff too!..coz i'm a lazy sod!...

http://gaussmarkov.net/wordpress/thoughts/wiring-up-a-1590b/


edit: i only use a psu, i don't use batteries so i only need to use 'mono' jacks....you only need to use a stereo jack  if using batteries ok...

[threepwood]

Bookmarked!
Thank you, you're a gent!