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.

Wednesday, April 26, 2017

Lovepedal JTM

Got a request for this one. It's another Electra-derived overdrive, this time meant to sound like a Marshall. This should be an easy fit in a 1590A.


16 comments:

  1. Excellent!!! ohhh my god!!
    this is better with 5k Log??

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    Replies
    1. No, use a lin. It's controlling how much signal for the emitter is going to ground. It's not a volume control.

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    2. Thanks so much!! i waited for this layout!!!

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    3. Add 100k log at the end of the master volume, and use the pot in the Gain layout.

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    4. The pot is just a hand-rolled 2K rev log if I'm reading this correctly. This version of the circuit is really nice. I need to try some different diodes, but I already like it a lot more than the Champ from last week.

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  2. Hello, i used 2n5088 transistor, how i can dial sound with him? Thank you)))

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  3. Replies
    1. Check your build for faults and then with an audio probe if that doesn't work. If it's still not biasing correctly, play with the value of the 3.3k resistor going from the voltage rail to the collector.

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    2. Thanks for helping with, i check with variable resistor but still fail, i heard clean sound after dialing up resistor but it too scilent((

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  4. You can verify it.
    I've built it with a 5817 diodes
    Works great
    Thanks

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  5. I've built it with 2N5088 and germanium diodes, works great....Thank you so much for this layout...

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  6. Hi, works great with bc549. Mounting the pot soldered over the PCB, it should be placed on the traces side, right? Thanks for your great work! Regards

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    Replies
    1. Yes, mount the pot from the solder-side of the board.

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