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, October 28, 2015

Earthquaker Devices Hummingbird

Here's a cool variation of the Vox Repeat Percussion tremolo from EQD. It adds some extra controls to the original circuit for more versatility and control. I had a hard time tracking down a schematic for this one and ended up just tracing the vero layout from the Tagboard Effects blog. So here you go internet, the schem for the Hummingbird:



36 comments:

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    1. Use the search bar. It was back in Sept.

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    2. Hey :) for some reason when I try to search 'hummingbird' using the search bar it gives me no results! Weird. Just thought I'd letcha know.

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  2. Hi. Would it still work if I swapped the 5457 with a 5458? I'ts difficult to get a 5457 here and I found some posts that say they're similar. Datasheets say that too. I'll appreciate any opinion anyone has. Thanks. :)

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    1. I think a 5458 would work just fine. You could also try a J201. Sockets are your friends ;)

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    2. Thanks man! I should've bought that 5458 when I had the chance. When I do, I'll do my best to verify this layout. :) Cheers.

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  3. I think you can call this one verified.
    It's working as far as I can tell. But it's popping like crazy.
    I had the same problem with others layouts of this pedal.
    Any ideas on how to make the popping noise subtler will be appreciated.
    Will shielded wires help?
    Thank you very much for all the effort and the layout guys. This is a great site.

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    1. Is it popping with the rate of the effect or just when you turn it on/off with a switch?

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  4. Sorry. Wrong word.
    It is ''ticking'', with same rate as the LFO.

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    1. I don't think you're alone with the problem when cloning the Hummingbird. Lots of people had similar issues over on the Tagboard blog. First fix to try is upping the value of the power filter cap (second 100µF cap from the left) to 220µF or higher. You may also want to run the power through a 100-200Ω resistor before it hits the board.

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  5. Hi! First of all thank you for all the effort you put on the site.
    Regarding the hummingbird, is it possible to have a rate-indicator led instead of the classic fixed one?
    Should i have to take the led + (or - ?) wire from somewhere around transistors?
    Thank you again for your site :D

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    1. Someone asked the same question over on Tagboard and lvlark had this advise:

      When you add a rate LED to a tremolo or similar you need to take the feed for the LED off the LFO. I'm not an familiar with the 2N2646, but it looks as though you'd need to take the feed from B2. Best way to check is to get out your multimeter and measure between each pin and ground to see which one has the rising and falling voltage in sync with the tremolo. Add a current limiting resistor to that pin's row, and feed the LED from that. The CLR value is dependant on how bright you want it, what type of LED you're using etc.

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    2. Super-cool!
      I'm absolutely tryin' it in the future!
      Thank you :D

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    3. This comment has been removed by the author.

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    4. you need to add the LED in parallel with R11 :-)

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  6. I have build this layout 2 times. The second time I used the BC549C instead of the 2N5089 and the 2SK168 instead of the 2N5457. It worked without any problems. Also instead of 25kohm pot for the depth I used a 50kohm pot. So apparently the layout can work with alternative transistors and pot values.

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    1. Any change in the depth pot?

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    2. I used b100k for speed, and b100k on input.
      Work great

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  7. What about to use SPDT on/off/on in mode switch?
    Will work without any cap (middle/"off" position)?

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    1. You could try it, but those are some pretty high value caps being switched between. It's likely that no cap to ground there will result in some weird speeds.

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    2. Sure.. I'll give it a try.
      As I notice in the "mode 3" in the latest EQD version, it's in the middle position: an ultra super percutive speed.

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  8. Great tremolo... the best one IMHO.

    How can I add an rate indicator LED? Is that possible?

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    1. Found it: you need to add the LED in parallel with R11.... and voilà!

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    2. Hi, great info! Does your led flash in bypass? If don't, how do you achieve that? I can't figure it out :S

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  9. Replies
    1. Not without redesigning that portion of the circuit. :\

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  10. Test the circuit first on breadboard its working as it should. Build it on perfboard.
    only the level control works, it act like a clean boost when pedal was engaged. Any idea? Thanks

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    1. Short answer: You built it wrong. :D

      Long answer: Check your connections around the Depth pot and R4 on the schematic (and really anything in the LFO).

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    2. Do you think my 2n2646 is still ok? That's the LFO right? I'll see it again to check the depth pot and r4 as you suggest. Thanks

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    3. Yeah, definitely check around the 2646 too. Those are old devices and I don't know how reliable they are. I've only built one thing with 2646, so I don't have much experience with it.

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    4. I've run check on the circuit again checked for possible mistake...I've heard the ticking. The ticking changed when I turned all the knobs and switch, in that way I'm thinking 2n2646 is still functional together with the knobs and switches...so the problem narrows down with other parts and solder sides. The ticking almost gone in lower level so not much a bother to me..but still just clean sound no tremolo. By the way I solder 2n2646 direct to the board no socket only 2n5457 an 5089 are socketed. Just worried that I might fried it when I try to resolder and solder again. Maybe I should socket it too...thanks will post you an update once I get this thing done...

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  11. Great job! Does the Level pot increase the gain of the circuit as it is turned clockwise? I mean the light overdrive that you can hear with the Depth pot all the way up.

    I've built a Vox Repeat Percussion based on another layout with a similar Level pot and its behaviour is this: as you turn it clockwise you get more volume (as expected), but you get more gain as well. I think this effect sounds great with a little bit of this overdrive. I like to set this kind of effects at the same volume as the guitar but if I do that with my build I don't get this light overdrive I said before, at least at unity gain. What I get at unity gain it's not as much overdrive as I would like.

    So, is there anyway to control gain and volume in a separately way? As in every OD, fuzz or distortion pedal. I'm not an expert but I'm enjoyining a lot! :)

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    1. It's not designed to give overdrive. The level pot is there to help set the volume of the signal coming into the circuit, and probably to keep the circuit from distorting. Easiest way to add drive is to push this pedal with an overdrive pedal. But you could also play with the values of R5, R6, and C4.

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    2. You're right about putting it in front of an overdrive pedal, but if I can avoid it by getting more gain with the hints that you gave, so much better. I think I will try with some trimpots for R5-R6 and see what happens. I will tell you how it went.

      Thanks!

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  12. Hi, what's about a 2n6027 instead of 2n2646, would it make any major difference? thanks

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    1. It shouldn't. But you'll need to modify things a little to get it to work with the 6027. See the more recent Skippy layout for more info.

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