http://www.jameco.com/Jameco/workshop/puzzler/puzzler11.html?sp_rid=MjM4MTI3MTYwNDgS1&sp_mid=3701283
long live forrest mims!! ;)
Interesting role reversal, back in our reality it's the photoresistors that are being phased out by ROHS, possibly by the end of this year if manufacturers don't beg for more time again.
the morley 'pvo' volume pedal uses this trick!
yep and morley wahs... :)
Quote from: Quackzed on October 13, 2011, 01:24:36 PM
the morley 'pvo' volume pedal uses this trick!
Yup, was just going to post this same thing. :)
I believe Behringer's wah does too.
digitech multieffects do too.
its better than a pot for a few reasons imho, no pot to wear out, scratch etc... as well as offering a way to alter response or taper.
on the downside its a mechanical headache to diy, but gutting a morely to make something isnt unreasonable...
There is another way. Diffuse the LED through some paper and mount one or the other onto the treadle. Would have a similar effect without requiring a precision cut right?
Could a magnet and hall effect sensor be used? I know you can get ones with a "linear" response but I've never looked into it.
Well , Marshall has applied successfully for a exemption .
More Manufacturers will eventually follow suit , i just hope for a RoHS initiative decision overturn just so we can continue using CdS photoresistors , they rock .
as you all probably know ::), i made a little circuit that gradually lights the led as it gets darker...sort of reversed led/ldr combo...ive used it a lot...and its really smooth..
in fact i made 2...one has a sensitivity pot on it......please dont discontinue ldr's...i love em... :icon_evil:
http://www.aronnelson.com/gallery/main.php/v/chickpea/darklight2.jpg.html
Marshall has just got to the end of the year as far as I know.
enlighten me, why are they being phazed out?....some environmental blah perhaps?.. ::)
Cadmium
thanks: isn't that in batteries too though...Ni-Cad ?...i would think they are more popular than ldr's.. :-\
They have immunity for now, also batteries for cordless drills etc. It's all a bit silly really. The amount of lead in solder compared to the lead in car exhaust fumes etc.. The fractions of a gram of cadmium in an LDR compared to all those batteries as you say. In principle, I agree with legislating to get rid of toxic chemicals, but the ROHS regs look like a bunch of vicars sat down with a list of "bad" chemicals and a Mouser catalogue. There doesn't seem to be any balance in it either inside the electronics world or in relation to the world in general. Still they probably mean well. If they had the power to do it I'd like to see them regulating the reclamation of used electronics, probably have more effect.
LED's will probably be next, what with all that gallium arsenide in them.... oh no! Rob, not your precious lights! Don't worry, they'll have to find a replacement first and LED tech is booming.
yeah does seem silly....like you say there's plenty of other stuff they could look at...'green' energy saving light bulbs come to mind
don't take my little lights at the end of the tunnel away..... :'(
Yeah, they are full of nasty stuff, now there are millions of them and no-one knows where they will end up.
I'd rather them phase out the CFL's , that contains mercury :P
Anyway they are quite stupid , how in the world would you easily get access to a LED innards ? have they seen one before ?
still , that doesn't stop manufacturers from producing non-RoHS products , if they haven't applied for RoHS .
Good news . Just like 60/40 solder , they have phased them out , but it won't stop .
I'm sure you could extract the harmful chemicals from all of our benign, inert components by simply using a highly energy- and labor-intensive chemical and mechanical process. Then after you went to all that work to get the harmful chemicals out you could gather up several kg of the stuff (which would require perhaps all the LEDs produced over the past 5 years) and deposit it into someone's goldfish bowl and it would have ill effects to the parasitic fungi that live on the goldfish's scales.
All I can say is thank goodness RoHS is looking out for those parasitic fungi.
QuoteIf they had the power to do it I'd like to see them regulating the reclamation of used electronics, probably have more effect.
+1
they are regulating used electronics hitting landfills by way of regulating the manufacture, sale, import/export of products containing NON-ROHS compliant materials. they estimated that no product has a consumer life longer than 10 years. therefor, in 10 years, the world is saved by bureaucrats.
if you are shipping pedals you built out of the country, your pedal may get delayed, opened, tested, sniffed, and repacked with a note that says "passed ROHS ok" or "held for ROHS compliance, PASSED". I suppose its possible for a package to get denied entry to a country and/or returned to the point of origin. but in my experience its just a huge delay and an angry customer. uk customs passed it with lead solder. good job saving the world if you make the laws and then ignore them. @#$%ing politicians always trying to get a piece of the pedal game. they heard about the yachts yo.
wow...
well done, gents...
anyways, back on topic for a second, if i remember correctly, all you'd really need is a way to move something with a pedal that is clear and marked off almost in a fang kinda shape, with the sharp part at the bottom, the wide part at the top. put a little cardboard box over the part of the circuitboard that has the led in it so most of the light doesn't leak out of it other than thru the clear tapered part of the plastic thing attached to the pedal, and put the ldr on the other side inside the pedal. i mean...that's basically what digitech does on a bunch of their multi effects.
a little hard to describe, but doable, i think.
but that also makes me think about a cool way to do mechanical modulation...but in that case, use a pot like on a crybaby, not as a pot, but as a convenient spindle to mount a clear plastic wheel on...again, paint a pattern on the clear plastic, , stick an led or lamp on one side, a cheezy cardboard box around the other to shield it and stick an ldr on the other side...using the treadle would allow more or less light thru...volume, wah, whatever.
or...i know, sorry, i'll stop after this one...
what about TRUE mechanical modulation? we could use this same technique with a wheel mounted to a small lo-speed dc motor...
if we used rob's stereo led system, but changed it to incandescent grain of wheat kinda lamps, imagine using a treadle to control the speed and the wheel's shapes ccontroling the modulation at any speed you want...don't know if a motor will run that slow or not or be too noisy...
me? if i had the chops to do this? i'd put a mini web cam or four in there to catch the light show and project it at the wall.
;)
sorry. done now. carry on!! ;)
morley doesn't use the fang shape, they use a spotted design thats been dithered for screen printing. like when you export a gradient as a GIF and it makes pretty patterns to mimic fading intensity. what you are talking about with complex modulation waveshapes is interesting but I dont know how small you could get that down.
anyway here is something to think about
http://vimeo.com/4094488 (http://vimeo.com/4094488)
his page http://umatic.nl/tonewheels.html (http://umatic.nl/tonewheels.html)
wow, that's looking pretty cool!!
that's kinda like what i meant, but on a much smaller scale. thanks bro!!!
i just think the organics of a mechanical chorus or vibrato would be cool as hell. ;)
Quote from: earthtonesaudio on October 14, 2011, 07:04:09 AM
I'm sure you could extract the harmful chemicals from all of our benign, inert components by simply using a highly energy- and labor-intensive chemical and mechanical process. Then after you went to all that work to get the harmful chemicals out you could gather up several kg of the stuff (which would require perhaps all the LEDs produced over the past 5 years) and deposit it into someone's goldfish bowl and it would have ill effects to the parasitic fungi that live on the goldfish's scales.
All I can say is thank goodness RoHS is looking out for those parasitic fungi.
Why would anyone bother ?
QuoteTRUE mechanical modulation? we could use this same technique with a wheel mounted to a small lo-speed dc motor...
I've seen someone do this here on the forum, but I'm damned if I can remember when/where/who, maybe Mr Hammer will pass by and remind us, I think he posted in the thread.
would love to see more :icon_biggrin:
QuoteTRUE mechanical modulation
leslie?
yes, that's definitely mechanical modulation. but i'm thinking more like mechanical modulation with maybe a little dc motor spinning a small clear plastic wheel with a little bulb and a ldr ...hmmmm...
i mean in this case tho, using a mechanical way to control a modulation source. i think. too many ideas fill my head, and i know most of 'em don't work...lol