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.

25 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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    9. Hi @hobbystubba - can you try the fix I found below - change the 1K resistor from rate1, move it from connecting rate1 to ground to connecting rate1 to depth1. I had the same issues with the pots not functioning throughout the sweep until I made this change

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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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  8. the pedal Decreases volumen??

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  9. Video?? problems the layout??

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  10. https://www.youtube.com/watch?v=WDweFRjlTcA&t=2s Really good!! thanks

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  11. Hi guys, great stuff as usual - however I noticed some odd behaviour on mine which I tracked to what I believe is an error. 1K resistor from rate1 goes to ground on this layout rather than to depth1 as on original easyvibe circuit. My build was exhibiting asymmetrical LFO behaviour, odd behaviour of ramp switch and also my rate and depth controls were only kicking in halfway through the pot. I tracked it to this connection when comparing schematics and this fix sorted it out?

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  12. Is there any schematic with the Hammer/Zapart mods?
    Thanks!

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  13. Some one tried to build a "brake" with a momentary switch? Is that possible?

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  14. I can confirm that the 1k resistor does indeed need to connect Rate1 and Depth1 (and does not go to ground). I have a schematic that I created (combining the John Hollis and Piotr Zapart schems I found on diystompboxes), and a clumsy vero layout for four TL062s, if anyone still wants to see them. The Zapart schematic shows the 1k going to ground, which I think is the source of the discrepancy.

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