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, November 12, 2014

Trill Tremolo by MOD Kits

Here's another layout for a MOD pedal, the Trill Tremolo. On board pots and LED resistor to reduce the offboard wiring mess. I built this one this past summer and I liked the way it sounds, though the Speed control should probably be a reverse log pot. Haven't had the opportunity to experiment there yet. Here's a demo of the MOD kit:





The layout is verified and here's a few pics from my build.







11 comments:

  1. I've made something based on this layout and a schematic I've found online. I really like how it sounds.
    https://www.youtube.com/watch?v=ZQknuDFLPII

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  2. is it possible to replace mpsa18 with 2n2222 just like em-drive?
    i'm running out of mpsa18 and socket... :D

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    Replies
    1. You could try the 2222s, but higher gain transistors are a better route to go. 2N5088/5089 or BC550c would be good subs.

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    2. awesome, I got plenty of 2n088 and bc550c.
      thanks brother, it will be my next project

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  3. Hi man,
    I have built it but all I got was clean sound when I turned it on. Any idea?

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    Replies
    1. Guessing the LFO isn't working right for you. Here's the schematic:

      http://i.imgur.com/n5tE8Is.png

      The LFO is the bottom 2 transistor. Make sure the components going there are good.

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  4. Hello, I too have a clean output signal, a noise, like running, but there is no effect. All carefully checked several times.

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  5. Is there an easy mod to add a blinking led to this that changes with the intensity?

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    Replies
    1. Not really an easy mod with the existing board, but I think the LED would go between the collector of Q3 and the other components it connects to.

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  6. Hello storyboardist! I'm again with another noob question, i'm thinking to take on this tremolo next weekend, but the 100uf capacitor don't appear in MOD schematic, what is their purpose?

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    Replies
    1. That's there for power filtering. Not completely necessary, but a good thing to include.

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