can i use TIL111 instead of led/ldr?

[birt]

the TIL111 seems to use a phototransistor instead of an LDR. i thought it was just a led/ldr combo.

can i use it this way or is the TIL111 usefull for any other DIY project?

[The Tone God]

Look at the datasheet for the part and see if the specs meet the needs of the circuit or has similar specs of the part you are replacing.

I guess that was probably not the answer you are look for but your question is to vauge to give a good answer. You have not given enough information. I don't know what a "TIL111" is. How about a link to the datasheet ? I don't know what circuit you are looking at using this part in (Hey how about a link to that too ?).

Gotta help us help you.

Andrew

[birt]

datasheet: http://www.datasheetarchive.com/search.php?search=til111&sType=part

schematic: http://img384.imageshack.us/img384/9050/simplestaccatotremolocorrectio.png
both channels will have an inputbuffer tough

[petemoore]

  It looks like the thing puts an LDR series with signal path, and uses it as a 'valve' to attenuate it.
  For max output avalailable, the LDR exhibiting lowest resistance at minimum would be best, the output level can of course be easily compensated.
  For max depth the LDR needs to get to closing the signal path off, so high max  resistance would be what to look for for that.
  How fast the LDR can respond with resistance change over a wide range, to light changes of course...would be determined in use at faster choppier settings, if the LDR changes only so fast, the min and max R amounts won't be reached, hence depth is lessened.

[Stevo]

One is an ldr/led and one is an led/transistor...They are completely different componets.. As far as a use for an led/transitor I have never seen one, but I bought a few once and they are little and much much cheaper than an led/ldr.....couldnt make one work ....was trying to make a swell volume layout but have never seen anybody have one in any layouts!!!!!

[The Tone God]

As far as a use for an led/transitor I have never seen one, but I bought a few once and they are little and much much cheaper than an led/ldr.....couldnt make one work ....was trying to make a swell volume layout but have never seen anybody have one in any layouts!!!!!

One commercial/effect use that springs to mind is the bypass system in Voodoo Lab effects that uses a H11F* for switching the status LED. As for more audio uses the transistor generally cannot be used as a drop in replacement for the LDR but that is not to say that you cannot use them.

I have played with them in audio circuits but as in most cases when changing a part with one that functions differently you cannot look at a the single part alone instead look at the circuit as a whole. This means that you will probably have to change portions or maybe even how the circuit functions to make use of the part. It is possible to use the phototransistor in a audio circuit.

Back to the original question / topic in the circuit linked I don't think the part you specified will be sutable. I belive you will still need a LED/LDR combo. Sorry.

Andrew

[birt]

but i can hook up the transistor in a buffer/boost instead of just putting a buffer in front of the ldr and turne that boost on and off with the circuit i posted before wich is driving the led, right?

[birt]

little bump for the last question

[Stevo]

Birt.... I have some CLM 6000 that I am not using if you would like some we could trade something...Smallbear sells them!!  I would like to see a layout that uses an led/transistor for a componet except for bypass....They are cool and very small but I have never seen one in a circuit ...Now (the tone god) says you can use them that is all and good I figured you could I have yet to see one in a circuit though!!!    Dont quote me as saying you cannot use them......Quote me as saying I have not seen any used.....I have tried to make a swell pedal with one!!!!! Like a slow gear or something.....They are only 50 cents when a clm6000 is a couple dollars!!!!!  if you could ramp the led like in a compressor the gain of the transistor would change, that was what I was playing with .....no luck:(