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Friday, April 17, 2015

Skreddy Pedals Lunar Module

The Lunar Module was designed to get that Gilmore fuzz tone from Dark Side of the Moon.  It's an aggressive silicon fuzz with a wide range of tones. Got a request for this with the Pregain control as a trim pot. As the original 3-knob Lunar Module had the Pregain and Brite controls as trimmers, making a board for both is fairly easy. Transistors are BC109Cs, but BC550Cs would also work. You might want to use linear pots for the Body and Fuzz controls as some builders have had better results with those than the stock tapers.




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16 comments:

  1. faberOctober 19, 2015 at 11:43 AM

    Verified!

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  2. faberNovember 5, 2015 at 6:26 PM

    Sorry man forgot to check for answers..I'll post some pics tomorrow!

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  3. faberNovember 6, 2015 at 2:24 AM

    I know these are not high quality photos, but it is the better py phone can do :)
    I've added a current limiting resistor, it's the 5% carbon film in the upper side of the perfboard.

    http://s4.postimg.org/cz7x8h5dp/12202081_1053459334678985_1618989597_n.jpg
    http://s9.postimg.org/g2iewp7pb/12202157_1053456418012610_1687534134_n.jpg

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    1. UnknownNovember 20, 2015 at 11:40 AM

      This comment has been removed by the author.

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    2. UnknownNovember 20, 2015 at 11:43 AM

      what is the value of the Current limiting resistor ?
      seem like you avoided a 100K resistor.

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    3. faberNovember 20, 2015 at 1:52 PM

      It's a 3k3 5% carbon film resistor. I've a stock of these so I always use this value but I think anything from 2k2 to 4k7 would be OK, just more or less brighter. If you are confused by the led wiring, it's a Rgb common anode, so one wire from the CLR to the led's anode and 2 from led to the ground

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    4. UnknownNovember 20, 2015 at 2:33 PM

      now i got it ! Thanks for the explanation.

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    5. faberNovember 20, 2015 at 3:45 PM

      You are welcome, I'll post better pictures asap!

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    6. UnknownNovember 21, 2015 at 12:43 PM

      Have you used the R5 = 100K which is connected to the Base of Q1 ?

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  4. faberNovember 24, 2015 at 1:01 PM

    Here a better image: http://postimg.org/image/6br0itvqn/

    Let me see..
    Yes, but I skipped the 56k resistor.

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  5. UnknownNovember 24, 2015 at 1:38 PM

    Thanks mate !

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  6. R. JacksonNovember 29, 2015 at 3:27 PM

    This is the same layout as the Screwdriver Deluxe and the Hybrid Fuzz Driver, right? I'd love to see you do alternate layouts showing those component values. The way I understand it, the Lunar Module used three silicon BC109 transistors. The Screwdriver used a BS170 MOSFET up front into a BC109 into an AC127 Germanium. Finally, the Hybrid Fuzz Driver uses a pair of Silicon BC109 transistors into an AC127 Germanium. I assume some of the other values changed as well. It would be cool to see the whole Skreddy Wars Trilogy. Heh...

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    1. Effects LayoutsDecember 3, 2015 at 9:25 AM

      I'll have to do some research and dig up the Skreddy schems, but that sounds like a good idea for a project. And I will definitely be calling it the Skreddy Wars Trilogy hahaha!

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    2. zedsnotdeadDecember 12, 2015 at 12:51 PM

      There are only a couple of differences between LM and SD, a added resistor somewhere I can't recall right now, but the layout is really very similar. But the resulting effect very different from each other :)
      Now, for Hybrid Fuzz Driver, I don't know if there's already a accurate tracing of it... :(

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    3. SandorMay 1, 2018 at 8:17 PM

      Is there any progress int the Skreddy Wars Trilogy?
      I was thinking of a possible mod. First I would change the Q3 to a Germanium NPN with fairly high Hfe and low leakage. I would change the 2.7K resistor to a 4.7K. Lastly I would put a B10K pot in the place of the 10K res going to the collector of Q3. This would be the Gate or bias.
      Also the 15 nF output cap seems a little small to me.

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