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  1. Thanks.
    You are right the diodes are not shown here, I added them for the SYMMETRY mod which is great. I used 1N4001 and they were just fine.

  2. Hi Doron,
    I don’t see where I used either diode, but generally speaking they serve the same function. The 1N4001 can withstand a greater amount of current and move voltage before dying, and when used for clipping the audio signal they may sound a bit different, but generally they’re interchangeable.

  3. Hi Harald,

    Sorry to bother you with this silly issue. I am just now building this great little tremolo which hopefully will fill all my tremoloing needs. What was the reason you chose the 1N4001 over the regular 1N4148 (1N914). Would it matter anyway?

    Thanks for your great contribution over the years. Love you stuff man.

  4. Hi Darren,
    You’re saying you get nothing even at the circuit input? Odds are there’s a wiring mistake somewhere, likely in relation to the 3PDT switch wiring. Check out the wiring section for off-board wiring illustrations, and the debugging section for some tips on fault-finding.

  5. I know this is a bit of an old thread but I’ve just had a throw at building this and I get the LFO working, both LED’s oscillate and are affected by all the relevant pots. The problem starts with the signal, I get nothing anywhere on the board. I’ve probed about and get a clean signal on the tip of the input jack socket but nothing actually on the board. Do you have any idea what could cause this?


  6. If I’m not mistaken the fine pot is just a small pot in series with the speed pot, but I guess you could end up with the symmetry and the fine pot stepping on each others toes. You could try to build the circuit with the symmetry pot and give the fine pot a try, then leave it out if it doesn’t work.

  7. Thanks but I can still have the fine pot as well, that is both fine and symmetry?

  8. If you want the “symmetry” pot rather than the “fine” one:
    – Replace “fine” pot with B500k
    – Speed 1, 2 connects to Sym 2 rather than Fine 3.
    – Sym 2 also connects to where it says “Fine 1, 2” on the board.
    – D1 cathode connects to Sym 1.
    – D2 anode connects to Sym 3.
    – D1 anode and D2 cathode both connect with Speed 3.

    I think that’s it.

  9. Hi
    I am a little confused by the symmetry hookup is it the same as the fine pot but with the diodes on lugs 1 and 3 or am I mistaking?

  10. I used $.95 ones from smallbear, but you can probably use a variety of different ones. Try the 5C3!
    Keep in mind that LDR’s have lots of variables to them, like transition times between states, in addition to the dark and light resistance which may or may not make the useful for a particular application. I think this circuit is quite forgiving, though.

  11. Hi Harald. What’s the value of the fotoresistor (R17)? Can I replace the LED + R17 with a Vactrol Optocoupler VTL5C3? I think the Vactrol goes from 500k (dark) to 5k (light).

    Thank you very much for this fantastic page.


  12. Alright! I’m sure you can pull it off, just keep your concentration all the way 😉

  13. Thanks Harald!
    I’m only starting the build now because I’m at school, and they’ve offered to pay for a Vactrol Optocoupler!

  14. This is where you connect your various wires (the text tells you where the other end of the wire goes). There’s usually also a list of additional required connections found in the lower part of the layout, this one, for instance, also need you to wire lug #3 on the “Spacing” pot to lug #1 on the “Smooth” pot.

    If you are just getting into this hobby I strongly suggest cutting your teeth on a simpler circuit. Suggestions: “DOD 250 Overdrive” or a “Silicon Fuzz Face”. The Tremulus Lune, with all of its pots and switches, can make even a seasoned builder cross-eyed!
    Whatever you end up trying, let us know how you do 🙂

  15. I’m a real novice with this kind of schematic. the text at the side of the board means…??? Thanks

  16. Hi Nathan,
    I don’t want to clutter up this site with even more files, but I can email it to you.

  17. Thank you for the great layout. It was my first soldering project since 20 years and worked like a charm. Now i will do some special mods and will plan them with the diy layout creator. maybe you could post the original file so i can reuse your work?

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