Thursday, 2 February 2012

ColorSound SupaSustain

This one needs an 18V supply, so use a dedicated supply, two batteries, or you could build up the 9V to 18V converter that I've posted here.  Best results may be obtained if you heat shrink the LED and LDR together or at least wrap a bit of electricians tape round them both.


7 comments:

  1. Tag it - with couple of notes...

    Circuit works as it should and sounds good. Like someone said over the interwebs, it's more like a sustainer than a compressor.

    Anyway. I built it with 18V pump, BC549Bs (measuring ~320 hFE) and custom made optocoupler. The LDRs i have seem to go only up to 60K of resistance when dark, so that makes the sound go overdrive. After socketing and lots of trial & error, i figured that the LDR should ideally be at least 500K when dark. I guess that 50K light and 1M dark would be optimal. Anyway. Since the 60K dark was (and still is) all i have, i upped the bottom 100R for 470K and used what i had for LDR. It works, but it is somewhat impaired. Of course it is, as it should let the LDR control 500K of resistance instead of 50K. It still works and sounds good. I'm happy with it.

    If i get my hands on more suitable LDRs, i might swap it and the resistor...

    Another one bites the dust! Is it now 11 'till 300? :)
    +m

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    Replies
    1. Oh. Yellow 5mm diffused LED :)
      +m

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    2. I just remembered that i had one "spare" VTL5C1. Sticked it in and it's better. Much better.

      It still get kinda dirty, but placing a 500K trimmer in place of bottom row 100R would be a good idea to clean it up a bit.

      I do think my choice of transistors may be the main cause for the dirt. 300-330 hFE may be just a bit too much.

      Nice project though. But nowhere near the more modern compressors. Although i like this, it's not going to replace my dyna clone.
      +m

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    3. Awesome, nice one Miro. Nearly there! :o)

      Delete
  2. Having trouble with a bad hiss in the mix when the led /ldr is added, no matter what the led ldr combo is, also have to put both pots to full to match dry signal
    Any idea where to start the debu

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  3. My electrolytic caps are only rated for 16v would that cause a hiss

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  4. In my original Colorsound pedal, the led/ldr has been replaced by a Clairex CLM6000 fromSmallbear. It works like a charm!

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