'LIGHTWAH'

arma61 · July 15, 2011, 03:31:56 PM

Rob isn't it missing ?

Quote from: deadastronaut on June 30, 2011, 07:27:38 AM
i have the darklight on a tiny breadboard 'seperate'

it wont work unless that emitter of the npn is grounded as well.(jumpered to ground).

the emitter, and the bottom of the ldr have to be grounded.

Gurner · July 15, 2011, 03:35:51 PM

I'd be inclined to dispense with R6 & just put your output pot in its place (use something like a 5k pot)...or you could just keep your 100k , in place of R6 but change the cap value to something like 50nf. Not exactly sure what purpose R7 is serving on the original Morley Wah cct (http://www.morleypedals.com/clwes.pdf to my eyes it looks like some form of output short cct protection).....it's presently acting as a potential divider in your implementation (which isn't R7 in Morley's cct's intended purpose for sure), so if moving the pot to R6's location just attach R7 between the pot wiper & the output jack. (even if you're not gonna move the pot to R6, R7 would be better on the output lug of your pot)

One component saved (R6) ...& possibly R7 if you're confident you won't short the output to ground at some stage ....let loose the pigeons!

iccaros · July 15, 2011, 10:58:00 PM

damn you DeadAstronaut
I have like 6 projects on the board... and now I want to make this....

I guess I better finish something to make room

deadastronaut · July 16, 2011, 05:00:03 AM

@matt, looks good...there is a 4.7k going into the sensitivity pot...that i added.. and the ldr should go to ground too...

look at the layout i did for vendetta...(i forgot the ground symbol on the bottom)......

as for light conditions...its ok..if its dark just flip the auto on....the foot wah was just an add on really , because i could...

@gurner, yep, i like to keep things simple....like me!..

...

@armando...you are correct!...the ldr should have a ground!..

@iccaros..i'll be damned..its great fun...

askwho69 · July 16, 2011, 07:41:38 AM

i have a stupid question rob... where the heck is the LDR "foot LDR"? is the sensor thing is just an ordinary LED? and the one below the Depth? please im very confused

mattthegamer463 · July 16, 2011, 08:40:18 AM

Quote from: deadastronaut on July 16, 2011, 05:00:03 AM
@matt, looks good...there is a 4.7k going into the sensitivity pot...that i added.. and the ldr should go to ground too...

look at the layout i did for vendetta...(i forgot the ground symbol on the bottom)......

as for light conditions...its ok..if its dark just flip the auto on....the foot wah was just an add on really , because i could...

Okay, I won't worry too much about it then. I'll basically do what you did with the foot LDR. I'll make the changes to my layout and schematic.

deadastronaut · July 17, 2011, 04:15:07 AM

Quote from: askwho69 on July 16, 2011, 07:41:38 AM
i have a stupid question rob... where the heck is the LDR "foot LDR"? is the sensor thing is just an ordinary LED? and the one below the Depth? please im very confused

the foot ldr is on the right of the schematic...

its on the bottom left on the layout...external foot ldr...

its not an led....hmmm...well it is sort of....take a clear led, cut the legs off, sand the bottom flat, glue that into a 5 mm bezel (metal one), then heatshrink the legs of the ldr
and glue the top of that to the bottom of the clear led...done....ok!.

Gurner · July 17, 2011, 07:22:27 AM

Quote from: deadastronaut on July 17, 2011, 04:15:07 AM

its not an led....hmmm...well it is sort of....take a clear led, cut the legs off, sand the bottom flat, glue that into a 5 mm bezel (metal one), then heatshrink the legs of the ldr
and glue the top of that to the bottom of the clear led...done....ok!.

What you're describing is a sort of reverse LED lightpipe.

Lightpipes are used with LEDs to erhm 'pipe' LED light from the bowels of the enclosure circuit board (eg an SMD LED) to where you want the LED to show (the outside world)....you're sort of doing this in reverse (ie piping the ambient light outside the enclosure to inside where the LDR is)....so an LED lightpipe would work if folks prefer to source one instead.

http://www.google.co.uk/search?hl=en&rlz=1T4GGHP_en-GBGB439GB440&q=led+lightpipe&um=1&ie=UTF-8&tbm=isch&source=og&sa=N&tab=wi&biw=1440&bih=644

deadastronaut · July 17, 2011, 09:31:10 AM

^ they look good!...

BoxOfSnoo · July 17, 2011, 10:05:50 AM

Quote from: deadastronaut on July 17, 2011, 04:15:07 AM

its not an led....hmmm...well it is sort of....take a clear led, cut the legs off, sand the bottom flat, glue that into a 5 mm bezel (metal one), then heatshrink the legs of the ldr
and glue the top of that to the bottom of the clear led...done....ok!.

not quite getting it. I think it sounds like you're not using the LED electrically, but just using the package as a type of lens (as per the 'lightpipe' comment). Correct? I wonder if you could do this with some kind of plastic bead or marble instead.

deadastronaut · July 17, 2011, 10:09:44 AM

hi jonathan: correct, just as a lens, and to protect the ldr as well.....yeah a bead why not...

askwho69 · July 17, 2011, 10:55:30 AM

@rob-- Thanks so much man you're magnificent !!! the idea is very creative :DDD

@gurner - thanks too! you added a clearance to my blocked MIND! < confusing puzzling description

i love this project!

A2

vendettav · July 17, 2011, 12:55:51 PM

Ah god.. why am so unlucky..
i was about to breadboard this until i saw that i have only one LDR... and then reading the discussion on this page i figured out what kind of a mistake i did by throwing those burnt LEDs away yesterday saying "who'd ever need these"...

deadastronaut · July 17, 2011, 01:00:37 PM

^ ha ha...yeah, a bit of recycling!...

you can never have too many ldr's....but you can always not have enough...

frequencycentral · July 17, 2011, 01:04:17 PM

It's better to have parts and no money, than money and no parts.

nocentelli · July 17, 2011, 05:38:36 PM

on the subject if LDRs, i'm guessing that the higher the max resistance the better, for the widest range - and you that can always dial it down with sensitivity/depth controls? or is it a bit more complex than that?

mattthegamer463 · July 17, 2011, 08:22:11 PM

Quote from: nocentelli on July 17, 2011, 05:38:36 PM
on the subject if LDRs, i'm guessing that the higher the max resistance the better, for the widest range - and you that can always dial it down with sensitivity/depth controls? or is it a bit more complex than that?

You can add a pot in series or parallel, to add/reduce resistance, respectively. However, they don't have linear resistance-to-light curves, so it may have undesirable effects.

mattthegamer463 · July 17, 2011, 10:03:59 PM

I just tried prototyping out the LFO-less pedal and it doesn't seem to be working. The LEDs are on, and one is aimed at the LDR that is near the transistor, and I added a ground connection I think you mentioned, to the emitter of the transistor.

I can hear the guitar but it has low volume, and changing the light to the LDR that is near the op-amp doesn't have any audible effect. I've tried a couple LDRs for different resistances, but still nothing. Any tips?

deadastronaut · July 18, 2011, 02:38:41 AM

is the 'darklight' section reacting to light?...with the sensitivity pot?...

does the wah work on its own...test with a pot instead of ldr..

once both setions are working, there shouldnt be any problem...

heres the darklight section only...note the ground...and ldr...

mattthegamer463 · July 18, 2011, 07:23:35 AM

Quote from: deadastronaut on July 18, 2011, 02:38:41 AM
is the 'darklight' section reacting to light?...with the sensitivity pot?...

does the wah work on its own...test with a pot instead of ldr..

once both setions are working, there shouldnt be any problem...

heres the darklight section only...note the ground...and ldr...

Looks like what I've got... I'll fiddle with it more tonight, and try substituting in a pot for the LDR. It should "wah" with a pot in place of the wah LDR. My 2N3904 got very hot when in use, I think it can't handle the current passing through when running those LEDs, did you ever have this problem? Seems like maybe a resistor in series with the two LEDs might be in order.

News:

'LIGHTWAH'