GorF Prototype Demo

Well, I found the problems, two were easy to fix in software (first was that the digits were backwards, so instead of GorF it said FroG, the second was I swapped the F and G segment lines around, which made the letters look a bit screwy), the third problem was my fault, basically I used active high switches, and I had pullup’s on this board for teh switch inputs, instead of pull downs, so it thought that every switch was held down. This explains the disco when powered up.

I’ve done a video showing the prototype board and explaining it in more detail than before. The digits seem a bit bright in the video, they’re not actually that bright in real life.

Anyway, here’s the video

I sort of like the size of it, but I’m a bit concerned that some may think it’s a bit to compact and bijou, so let me know if you think it should be a little bigger or not. I will need to do a couple of mods to the boards before making a full run, so now’s your chance to say!

11 Responses to “GorF Prototype Demo”

  1. noisesource Says:

    love this new design paul!

    how would i go about ordering one when you do a run of them?

    noisesource [at] gmail [dot] com

  2. Paul Says:

    I’ll post a blog on here when they’re available.
    I expect paypal will be the simplist/easiest way.

    I’m currently planning on offering the following ;-

    1) Board on it’s own
    2) Board with preprogrammed AVR

    I may offer a complete kit aswell, but that depends on interest and supplier prices.
    I won’t be offering pre-built ones, sorry. But there’s no difficult parts there and no surface mount so as long as you know one end of a soldering iron from another you should be fine.


  3. Patrick Kerrigan Says:

    Hi Paul, I just stumbled on your site a few days ago, I am very impressed with your designs. I am looking for a compact well featured sequencer, Gorf is an answer to all my problems, I cant wait till you get everything sorted. I am very interested in purchasing a kit from you when it gets released, cheers, Patrick

  4. Joel Says:

    Hi Paul, this looks great! I really like the small form, I can imagine it running something similarly sized like an Oakley TM3030. Is there enough room between the pots for you to put knobs on and still be able to turn each comfortably?

    I’d be interested in a kit – probably board plus AVR. A good parts list would be good as well, where have those LED buttons come from?

    Anyway nice work, I’ll keep an eye on this site! Joel

  5. Paul Says:


    Thankyou for your comments. I’ll be posting here and lots of places when the kits are ready.


    Alas there’s not enough space to fit knobs on, if Eagle didn’t have this limit I’d have used a bigger spacing so people could add knobs. I am looking for better pots though, more like the ones I used on the strip-board version.
    That said, you could always handwire bigger pots onto a panel.

    There will be a complete parts list done, along with as many suppliers as I can find for each part, for example if I can find the knobs from Digikey, Rapid and RS, I’ll list all three part numbers.


  6. noisesource Says:

    excellent. can’t wait to order and build this when it becomes available. :)

  7. Dave Says:

    Speaking for all Canadians, we love the small form factor – makes it portable and there are a lot cheap project boxes this could be stuffed into. People with chubbier fingers can always break-out the pots and buttons

  8. Jasonn Says:

    Yes, awesome concept, I’d definitely love a kit, though 16 steps would be nice, maybe there is a way to expand it on our own, or be able to chain two together. Anyway I’d take a kit 8 or 16!

  9. Tom Says:

    Hey Paul, that looks amazing!

    I would love to order a full kit and also it would be great to be able to know where to order a matching case for it. Would be great if the space around the knobs could be a bit bigger, so knob caps could be used.

    Greetings from Hamburg, Germany

  10. Paul Says:

    jasonn, I’ve been thinking about that, you could in theory add a second GorF and add some sysex to pass the step number between them.
    To expand it, you’d need more pins on the CPU, so sadly it can’t be done.

    Laurie Biddulph of Elby designs is working on a version with a bigger spacing between the pots for his Panther series of modules. as for cases I’ve not looked into them yet, but at 80mm by 100mm there should be hundreds that it will fit in.


  11. Jasonn Says:

    Chaining together would be cool, both in a ‘serial’ and ‘parallel’, say to get one track that was 32 steps long or to get 4 tracks that were 8 steps each. That would be a really cool ‘modular’ design, I’d definitely invest, especially if it’s battery powerable.