'LIGHTWAH'

[deadastronaut]

hi add:

ive never had ticking with this build, and i've built a few...its a really good and quiet lfo...

out of curiosity what leds did you use?.....

[add4]

I used an ultra bright blue 5mm for the internal LFO, 5mm green for the external LFO, ultra bright red 5mm for the foot and 5mm red for the external foot.
I tried with 2 utrabright in a row but they would barely light up ... using one normal one fixed it.

I also hear a BIG volume drop when the effect is engaged so i guess theres another problem .. maybe theres a very faint ticking in your effect and it's not hearable with a normal output volume ..

I'm certain there are some mistakes in what i did as it was my very first home etched board i'm already VEYR surprised it works (after a few hours of debugging the light sensitive part of the circuit .. (i never understood what didn't worked.. i finally desoldered everything and repopulated the board from scratch while checking continuity for each component ... )

the sounds pretty cool anyway

hi add:

ive never had ticking with this build, and i've built a few...its a really good and quiet lfo...

out of curiosity what leds did you use?.....

[deadastronaut]

i used bright blue 5mm on pcb board for the foot wah.....bright 3mm blue on box.

and bright 5mm yellow for the lfo on pcb board ..bright 3mm yellow on box.

[add4]

Can the choice of diodes make a circuit tick?

i used bright blue 5mm on pcb board for the foot wah.....bright 3mm blue on box.

and bright 5mm yellow for the lfo on pcb board ..bright 3mm yellow on box.

[deadastronaut]

i'm not sure on that, but thats the only difference i can think of...

i tried many different colours, and settled on those...with no problems with ticking whatsoever...even loud!.....hmmmm.....

[fretzburner]

mr.deadastronaut can i use this control pedal from pod xt live for this lightwah project? if so,how to convert this?I am building a multieffect using xt live housing.

[deadastronaut]

hi fretz:,  i guess you would have to treat it as in the morley way of doing things...

having a gradient (teardrop) slot, covering and exposing the led to the ldr.....as your treadle goes up/down....

just build the wah section, the tricky part will be getting the gradient just right to your ears...it'll be cool though when you get it sussed...

[fretzburner]

thanks deadastronaut for the fast reply.so i have to remove all these components and replace it with new pcb/components?i thought i could still utilize the circuit and just modify it for the lightwah application.Is there any other way to use the circuit?

[deadastronaut]

not too sure on that setup you have there...is is a pot?...or is it a led/ldr already?...

i guess you could hook up your dmm to those wires coming off the pcb, and see which ones give a reading as you move it!...

[fretzburner]

The two components right under the pedal are labelled D3 and Q29 and i'm confused why Q29.Is there a light dependent transistor?I only know LDR.I will try to supply it with 5 volts as that was what i measured before i disassemble the unit.But confusing because it consist of 6 wires.

[deadastronaut]

yeah might be photo/transistor....hmmm....ive never used one of those!...just ldr's..

have you got a pic of the inner workings?....

[fretzburner]

What you mean inner workings? under side of the pcb?haven't removed it yet from the housing.I thought somebody already figured it out.If it is really needed i will remove it so we could trace the circuit.

[add4]

It' working!
I checked the values of all components.. turns out i had put 150K resistors in place of the two 1M for the voltage divider before IC1, and also for R8 .. i changed all that and i still had the volume drop. then i decided to double check all values of the components of the board since i was obviously VERY distracted when i populated it .. (first homemade board withough silkscreen ... might explain that too). It turns out C4 was a 1nF cap instead of a 1uF one .. changed it, if works perfectly.
I REALLY should be more careful when i build.. i think i remember i had wine at the dinner and one or two beer with friends after that, then i came back home and started populating Oo. might explain that.. it' scary when you think of it obvious mistakes that are made because of drinking one glass too much.
Anyway, it works perfectly . ticking is gone too

I find the LFO a bit too sharp for my taste, i might try to mod the pedal to add a smooth switch or something like that in the future.
Thanks for your help!

Can the choice of diodes make a circuit tick?

i used bright blue 5mm on pcb board for the foot wah.....bright 3mm blue on box.

and bright 5mm yellow for the lfo on pcb board ..bright 3mm yellow on box.

[deadastronaut]

yay!..it works!... great!.. yeah its easy to get distracted when building, its usually my cat that distracts me...

lfo too sharp?...are your led/ldr's right butted up to each other../... try widening the gap a little...

[add4]

they are!
i'll try that thanks

yay!..it works!... great!.. yeah its easy to get distracted when building, its usually my cat that distracts me...

lfo too sharp?...are your led/ldr's right butted up to each other../... try widening the gap a little...

[DavenPaget]

Hey naut , where's thy schematic 

[deadastronaut]

http://www.diystompboxes.com/smfforum/index.php?topic=88582.msg820716#msg820716

searcheth and thoust shall findeth thy schematicus....

[add4]

Just a question out of curiosity: how do you hold the 3 mm less without bezels?

what's the box? i used this :
http://www.musikding.de/product_info.php/info/p582_Box-Type-B.html
and it's really small to stuff all that.. in fact the dc jack and one of the pots are colliding .. i might never be able to use the one i've made .. :p

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









works fine!...

tip. use low profile miniature electro's ...with the switch in the middle...

[deadastronaut]

hi add...

its an eddystone 1590b..

drill 3mm holes, and superglue just the lip/ridge of the leds and push in place...very solid..

note i used a small dc socket...not those 12.4 mm big @#$%ers....and low profile caps too...

[add4]

Good solutions!! didn't thought of glueing things in a pedal :p
Where do you find these nice adaptators? my drill hates drilling 13mm holes in the boxes.

hi add...

its an eddystone 1590b..

drill 3mm holes, and superglue just the lip/ridge of the leds and push in place...very solid..

note i used a small dc socket...not those 12.4 mm big @#$%ers....and low profile caps too...