This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.

Monday, March 7, 2016

John Hollis Ultra Flanger

Got a request for a flanger effect, and hadn't seen many layouts for the John Hollis Ultra Flanger (that didn't have tiny thin traces anyway), so I thought I'd give it a go. For the record: flangers are hard. I knew from the get go this one wouldn't fit in a 1590B, but it will fit nicely in a 1590BB. There's empty space at the top corners you can cut into to fit around the screw posts in the corners of the enclosure if you need to. Here's the schematic and here's what John had to say about the circuit:

I was originally going to develop a minimum part count version of the EH Electric Mistress. Instead I went for a something with the versatility of an MXR flanger and the extra wide sweep that the A/DA flanger was known for. It needed an extra chip to get the wide sweep but it's worth it. Current consumption is very reasonable at around 2 to 8 milliamps dependent upon clock frequency.




Update Aug. 3, 2016:
Fixed the connections from the MN3007 to CD4049. Note jumper under CD4049.

34 comments:

  1. the diode 4730 and the same 3,9Volts? Switch ON / OFF / ON? thanks

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    Replies
    1. Hey Wainer, yes it's a 1N4730 didde which is a 3.9V Zener Diode. The Switch should be ON/ON SPDT.

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  2. can i request "okko Dominator"? is awesome pedal

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  3. this layout lacks the trimpot 5K below is the schematic and layout for comparison, tanks

    http://www.4shared.com/account/home.jsp#dir=TwNDQ_U6

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    Replies
    1. That trimpot is not in John Hollis' original schematic. That's just an optional mod from RG Keen.

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  4. last layout from Hollis

    http://www.hollis.co.uk/john/ultraflanger3.jpg

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  5. Does this pedal distort a little or is it the Video clipping

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  6. i built this part for part by your layout and does not work, all i get is noise but no flanger

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    Replies
    1. try changing the power supply section lfo like this:

      http://www.diystompboxes.com/smfforum/index.php?topic=111502.0


      you must tell us if it works ; )

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    2. Also this information could help you...

      https://sites.google.com/site/flofxdiy/deticking-lfo

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  7. i have a solution for this.... change the zener 3.9v for a 10k resistor, with this u obtain a nice chorus, if you disconnect pin 4 mn3007 from ground and put a voltage divider (14K-1K) instead of it, you obtain a flanger... try it if u don't want more noise!

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  8. Schematic is wrong. first of all pin 13 of cd4049 is connected.

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  9. the correct order should be
    pin 2 of MN3007 -> pins 15-12-10 of CD4049
    and pins 14-11-9 of CD4049 -> pin 2 of 4046

    second set

    pin 6 of MN3007 -> pins 2-4-6 of CD4049
    and pins 3-5-7 of 4046 -> pins 3-4 of CD4046

    Layout needs to be reworked

    ReplyDelete
    Replies
    1. Can you provide a corrected schematic?

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    2. You Can See this diagram for the CD4049 pin
      http://i.imgur.com/c88Bf1y.jpg
      http://www.geofex.com/PCB_layouts/Layouts/ultrafln.pdf

      and here for the Ifo changes
      http://www.diystompboxes.com/smfforum/index.php?topic=111502.0

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    3. That schem is really tiny. Can't really read the values or pin numbers...

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  10. 1N4148 diode (just beside the 1N4730 Zener)should have its polarity reversed

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    Replies
    1. Thanks for finding the bugs. I think I've got it sorted out. Layout has been updated.

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  11. Good morning, first place, congratulations for the page. Realy I built but don't work. Some solution? can you help me? thanks.

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    Replies
    1. The layout had a few errors that I just fixed. Sorry about that!

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    2. I did it 3 times, two of them with new components and it does not work. The effect of the guitar comes out totally clean. They should corroborate before giving it as verified

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    3. Check you don't' have a bridge somewhere, run a knife through anything suspect the components are close as is the ground pane I have gotten a few pedals working that way .

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  12. Thank you for the layout, just finish it and it works. You can tag it as verified. I build the PCB version but sadly I etched it before you last correction so I had to add 2 jumpers under the CD4049.
    Thanks a lot for your work.

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  13. How much ohm for setting the 100k trimpot???
    Can you help me please

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  14. Replies
    1. I would just adjust them till it sounds right. I don't know any exact settings. If there was an exact value it would be a fixed resistor.

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  15. Excuse my English, but manufacture this effect and although you can hear the '' tick '', the guitar comes out totally clean. Can the problem be in the IC MN3007?

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  16. I'm not going to lie, buying list would be pretty handy

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  17. Hey there, thanks for providing such a great resource!
    I'm looking on Small Bear for the 4049 chip and there's 4049UBE and 4049BE options. Which one would be the right chip for this project?
    Cheers!

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    Replies
    1. None of the documentation I've seen on this circuit specifies which one. You might want to grab one of each and socket that chip so you can test which one works best.

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