'LIGHTWAH'

bluesman1218 · March 13, 2011, 01:52:51 PM

Quote from: deadastronaut on March 13, 2011, 01:50:28 PM
Quote from: bluesman1218 on March 13, 2011, 01:47:18 PM
Quote from: deadastronaut on March 13, 2011, 06:12:48 AM
@steve like these!...

http://cgi.ebay.co.uk/5-x-Light-Dependent-Resistors-LDR-light-sensor-/300421550722?pt=UK_AudioElectronicsVideo_Video_TelevisionSetTopBoxes&hash=item45f2851282

Thanks, Rob. Anyone have a US source for these? I couldn't find them on Mouser or Digikey.

hi steve, probably at radioshack?....the usa version of our uk maplins..

they might call them photoresistors...

Will check RS. BTW, dumb question coming...... does the LDR function electronically, or does it need to "see" light?

deadastronaut · March 13, 2011, 01:55:28 PM

the ldr reacts to the flashing light from the led going into it...the audio is just being cut down/off when light hits it..giving the tremolo effect...

not dumb at all..

heres a video of it (ldr/photoresistor) in action..from my original video..i had it wahing..when it got dark, instead of light..though!.

http://www.youtube.com/user/100roberthenry?feature=mhum#p/u/5/SEPIKOnpiNE

gnognofasciani · March 13, 2011, 01:59:08 PM

Quote from: deadastronaut on March 13, 2011, 01:24:59 PM
great gnogno...just noticed the protection diode too...great forgot about that!..good idea!
looks good to me,
so the buffered version, would cure the 'pulse mode volume drop then?..

It won't unless i mod the last stage to be a recovery stage (we can use a dpdt to switch to the pulse mode and select the boost mode for the last stage)...

deadastronaut · March 13, 2011, 02:03:22 PM

hmmmm. ok. got you!...

i think i'll stay with the simple version for now...still sounds excellent,

to be honest the pulse bit was just added on at the last minute, just because i could!...still a good effect for home recording etc.a nice little add on, just not good for live situations on that mode.

but the rest has no problemas at all as far as i can see/hear..

bluesman1218 · March 13, 2011, 02:13:12 PM

Quote from: deadastronaut on March 13, 2011, 01:55:28 PM
the ldr reacts to the flashing light from the led going into it...the audio is just being cut down/off when light hits it..giving the tremolo effect...

not dumb at all..

heres a video of it (ldr/photoresistor) in action..from my original video..i had it wahing..when it got dark, instead of light..though!.

http://www.youtube.com/user/100roberthenry?feature=mhum#p/u/5/SEPIKOnpiNE

Got it, Rob. Thanks. I'm assuming if I build it, I'll automatically be playing like you and David Gilmour.... unless, of course, I come down with symptom 6!

deadastronaut · March 13, 2011, 02:14:26 PM

you never know...

tyronethebig · March 13, 2011, 03:17:22 PM

Radioshack has them, thats where I got some

deadastronaut · March 14, 2011, 06:30:37 AM

just a word of advice ok....

i would definately socket the ic's (goes without saying i know)

but i would also socket the 2.2k that goes to the power of the 555...just as a precaution, as we know tolerances can vary...and this is crucial against any ticking problems.

i used a LOW POWER TS555CN. and have no ticking problems with ticking on this. ok... but other 555's may give out a tick.

also the 5mm leds i used are green for rate. blue for ldr..clear lense hi bright...ok guys.

at least if you socket the 2.2k , you will be able to try a pot in there to get the desired anti-ticking voltage to the chip ok. (this is how i had to do it when getting it together on breadboard)

cheers guys.

deadastronaut · March 14, 2011, 11:45:08 PM

@gnogno,

where does that 100nf / c9 come from...?..added dc filtering..?...

i etched a board tonight, .. trying it out.....

gnognofasciani · March 15, 2011, 07:09:41 AM

Quote from: deadastronaut on March 14, 2011, 11:45:08 PM
@gnogno,

where does that 100nf / c9 come from...?..added dc filtering..?...

i etched a board tonight, .. trying it out.....

Yep! I should have added a resistor before the caps to make the filtering more effective

askwho69 · March 15, 2011, 09:52:18 AM

Hi all!

Rob i got an expression pedal,got it from a friend traded with clone crunchbox! hehehe

By the way how can i add the expression pedal on this? connect a stereo plug from the pot?

Thanks

deadastronaut · March 16, 2011, 04:00:05 AM

Quote from: gnognofasciani on March 15, 2011, 07:09:41 AM
Quote from: deadastronaut on March 14, 2011, 11:45:08 PM
@gnogno,

where does that 100nf / c9 come from...?..added dc filtering..?...

i etched a board tonight, .. trying it out.....

Yep! I should have added a resistor before the caps to make the filtering more effective

i was just curious..

@ask: not sure if all expression pedals are the same wiring, but yes i would think it would go to your wah pot, via a switch...

maybe someone else could chime in on this.....but yeah it would be a cool addition/option too..

@all . got my pcb built last night...got it flashing...then got pissed with a few mates

...trying it out today ok!...looking good so far guys...

edit:...ok its working...got bad ticking though!....hmmmm... didnt tick at all on breadboard!....hmmmm.......

ticks just as the led reaches peak brightness and begins to fade....

tasos · March 16, 2011, 08:46:30 AM

Quote from: deadastronaut on March 16, 2011, 04:00:05 AM
ticks just as the led reaches peak brightness and begins to fade....

here is a though!...you can try a semi transparent film between led and ldr...

deadastronaut · March 16, 2011, 09:12:30 AM

hmmm... its mad because i stuck that 2.2k in there on the 555 power to stop any ticking... it worked perfectly for that on breadboard..

i might take it out and try a pot on there and see if i can take it down to where it might not tick..hmmm....bummer!..but hey, gnogno's pcb works!..cheers gnogno!..

just a bit of tweaking on it, and it may be ok....pretty unusable as is though!..too noisey at mo..

gnognofasciani · March 16, 2011, 09:25:47 AM

great! I hope it doesn't depends on my pcb $:-\$

bluesman1218 · March 16, 2011, 09:27:40 AM

Quoteedit:...ok its working...got bad ticking though!....hmmmm... didnt tick at all on breadboard!....hmmmm.......

Rob,

Just have a custom enclosure built, install the breadboard and buy another breadboard for prototyping. Simple solution to complex problem! Now just relax and have a cold pint.

deadastronaut · March 16, 2011, 09:37:14 AM

Quote from: bluesman1218 on March 16, 2011, 09:27:40 AM
Quoteedit:...ok its working...got bad ticking though!....hmmmm... didnt tick at all on breadboard!....hmmmm.......

Rob,

Just have a custom enclosure built, install the breadboard and buy another breadboard for prototyping. Simple solution to complex problem! Now just relax and have a cold pint.

yeah... could do....i'll have a whisky as well, and have a think!...

deadastronaut · March 18, 2011, 08:20:32 AM

tried a few things out... this is behaving like a ....

heres a clip of it..

http://dl.dropbox.com/u/7464107/clickytickeybastard.wav

got to find a decent lfo with no inherent ticking, and get rid of the led/ldr i think...

tried lowering the v to the 555... no joy!..

any ideas guys?...

~arph · March 18, 2011, 08:31:31 AM

Yes, check the little angel LFO.. or any other opamp tremolo lfo.

the 555 is notorious (at least use the CMOS version)

deadastronaut · March 18, 2011, 08:46:33 AM

cheers arph,

yeah i have the cmos 555 (ts555cn)...i cured the tick on the tiny trem with the 2.2k, thought it would be ok on this.

its strange it all worked ok on breadboard, and i used the bb parts to build it too...

i'll have a look...

the main problem is that the lfo i was using had the advantage that it was fading the led to get that slow sweep on the wah,

rather than a on/off lfo which would be 'quack quack'.....

@arnoud: do you have a lfo diagram that can do this?..slow ramp up and down...?

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