Monday 2 September 2019

Keeley 1962/1962X

*Edit 20190915* Now a verified layout of Keeley 1962/1962x. The only difference between them is LED or MOSFET clipping in the feedback loop. So the switch alter between 1962 mode and 1962x mode.
Schmidse noticed a couple of errors in the layout, a resistor and a cap across pin 6 and 7 of the op amp were missing. Managed to squeeze them by shifting around a few components and adding a link and a cut.



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12 comments:

  1. Schmidtse15 September 2019 at 10:23

    Thanks for the Layout. It is working, but according to the schematic over at fsb there should be a 110kohm resistor and the cap between pin 6 and 7 of the ic.

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    1. fuzzhead15 September 2019 at 21:03

      Thanks for noticing and sort of verifying it. A bid "Do'h" moment on my behalf. Updated the layout above.

      Delete
  2. dragão27 October 2019 at 23:18

    Nice one. Thanks for the layout. I've presumed (well) that Volume 2 to output.

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    1. fuzzhead28 October 2019 at 13:23

      Yeah, thats correct. Just added the notes to the layout.

      Delete
  3. JS13 November 2019 at 20:13

    On keeley's website it says that mosfet clipping is louder, but on my build it's actually the other way, the led is louder. Does it work like that on your build too?
    The only thing I'm not sure is wiring the switch, I presumed numbering of pins like this:
    2|4|6
    1|3|5
    The other thing is LED that is listed as D3 but on the picture it's labeled as D2.

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    1. fuzzhead13 November 2019 at 21:29


      I think you got it right about the switch. Another way to see it is like this:

      1 4
      2 5
      3 6

      Diode labelling is a typo, will fix it ASAP.

      I haven't built this yet but the layout is verified by Schmidse.

      Delete
  4. JaySharp25 January 2021 at 16:01

    Should the 2n7000 image be flipped 180 degrees to represent the pinout correctly? The DGS placement is correct...

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  5. Ben Spinks24 August 2021 at 17:03

    Would a 100k resistor make that much difference subbing the 110?

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    1. fuzzhead24 August 2021 at 17:48

      That is a feedback resistor for the second gain stage. 100k will give a wee bit less gain but I think the difference will be miniscule.

      Delete
    2. Ben Spinks24 August 2021 at 20:21

      Great, thanks.
      Cheers
      Ben

      Delete
  6. Tom15 July 2022 at 04:06

    Hope you're feeling okay Anders. I felt like crap all day but got sick of laying around and built this circuit. This is a nice sounding overdrive. For future builders, D1 & D3 are 1N4001. D2 is a 3mm red LED. (as shown in the actual layout) Thanks for the layout.

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