Wednesday, 20 April 2016

John Hollis - Easy Vibe (with mods)

Here is a layout for John Hollis Easy Vibe.
I've added Mark Hammer's anti-ticking mod and Piotr Zapart's LFO mods.
Try 5K/20M LDRs.

16 comments:

  1. I built it. It is verified. Not quite completely tick free, but not bad.

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    1. Wow! That was quick!
      Still ticking?
      You could try to increase the 10uF cap on pin 8 of the LFO IC to see if it makes a difference.

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  2. is the LFO mod connected with some discussion I recall on skewing the wave symmetry?

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  3. Please could someone help with what is probably a stupid question. I'm quite new to building stuff. What are the rectangles around the pairs of LDRs and LEDs. Thanks, Pete

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  4. Please could someone help with what is probably a stupid question. I'm quite new to building stuff. What are the rectangles around the pairs of LDRs and LEDs. Thanks, Pete

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    1. That's just Alex's way of identifying which LED is paired with which LDR as if they were actual resistive opts-isolators (vactrols)....and indicating that the pairs should be taped/heat shrinked together to block any ambient light from any of the other LEDs.

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  5. is there a way to add an led that will indicate the effect rate ? during bypass would be handy

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    1. Not 100% sure but I think you should add it from pin 6/7 of the bottom left TL062 (where trimmer is). Add a 1K resistor from pin 6/7 to LED+. LED- to ground.

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    2. just tried with jumpers and works perfectly, hopefully doesnt change the sound.

      built it this afternoon, sounds so good

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    3. Glad it worked.
      I think It won't change the sound.

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    4. the depth and rate pots only seem to work between sorta 7-10 nothing much below that. would swapping some values somewhere help??

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    5. I haven't built it but that doesn't sound right.
      Was it doing the same even before you added the Rate LED?

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    6. Yeah i havent added the led yet. it was doing this before

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    7. There may be a problem somewhere.
      The values should be the correct ones.
      Have you tried different LDRs/LEDs combinations?
      Other pots (Linear, Reverse Log..)?

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    8. not yet, good idea, thanks alex!

      update re: rate led.

      attaching to pin 6 of the ic does give the led the pulse but prevents all the other internal led from flashing.

      i jumpered from the positive side of d4 without an change in sound

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  6. Anyone know how to add a clean blend/mix knob to this? Interested to see what the results would be...

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