Rockit Assembly Instructions

I have updated the value of a number of resistors. These are recommended, not required changes. I have left the instructions as they were initially to try to avoid confusion. Here are the recommended changes:

Reference Designator            Former Value               New Value

  1. R7 and R34                          470                         100
  2. R16                                       100                         220
  3. R17 and R18                        1.5k                         1k
  4. R75 and R76                        16k                          18k

Assembly Instructions Link

18 Comments

  1. Thanks for doing this man, Just received my board and chip, can’t wait to build it! I will try to do a time lapse when I get to it!

    • Fixed. Thanks for pointing it out. I found that the 47k resistor image was actually the 470 Ohm resistors. Please check that you didn’t put in the wrong part.

  2. My board and chip arrived this morning. I had to pay an extra £11.15 tax (about $17.50) but I’m looking forward to building the thing. I’m really glad you’ve put these instructions together.

    Would you recommend using IC sockets, or is there no point?

    • See. That’s how the American revolution got started.

      I don’t think sockets play well with the case but it’s up to you. I haven’t heard from anyone building their kit of any ICs being damaged. I don’t think it’s too hard, just don’t linger with the iron on IC solder pads and make sure to discharge yourself of static electricity before you start soldering.

  3. short a few parts, minor, but finding instruction 5.o. too vague, it goes “under”? You mean thru hole from the back of the pcb? Which 14 pin op-amp?

    A a good hi res of a finished assembled board is always good for troubleshooting when a part went wrong.

    Even better a pcb graphic with red dots to showing the location of each type of part as you go through the instructions.

    If you want the instructions as a pdf download file I can do that for you.

  4. Hi

    Can I just check something? On the BOM, you’ve specified C9, C14 and C27-C30 to be 22nF ceramic capacitors. Above though, you’ve said that they should be marked ‘222’, which means 2.2nF. 22nF would be ‘223’.

    (it goes like this: the first two characters give the significant digits, the third character gives the 10 multiplier, and the answer is given in pF. So, 222 is 22 * 10^2 = 2200pF, or 2.2nF, whereas 223 is 22 * 10^3 = 22000pF or 22nF)

    Cheers

  5. This was my first big soldering project, I built the Rockit with a friend and got it to work on the first try. I struggled a bit with the power connector (I had one of the early kits) but made it work by soldering it to wires.

    Thanks for this great project, I can’t wait to see what mods people come up with!

  6. I just had a chance to assemble one of the original kits yesterday. It powers up and acts fine (except that the LFO_1_RATE LED doesn’t light up), but no sound in drone mode or with MIDI in. I made all the recommended resistor replacements on the top of this page and in the instructions, with one exception: R75 and R76 are still 16k since I didn’t have a spare 18k around. Also, my replacements (1k in R17 and R18, 100ohm in R7 and R34) have 5% tolerance. Would that make a difference? Also, I didn’t pay attention to the polarity of the smaller capacitors — only the 10uF and 100uF (and diodes). Beyond that, I clipped (and electrical taped) the stereo output leads 2&5 and am using a mono cable, and I can’t see any obvious bridges or cold solders. Would those resistor changes have an effect? Thanks!

    • Those resistor tolerances probably don’t have anything to do with the lack of sound. It’s possible there’s a solder joint problem as you suggest. The best tool for the job of troubleshooting something like this is an oscilloscope. If you have one, I’d be glad to walk you through troubleshooting. Worst comes to worst, if you send it back to me, I’ll get it working and send it back to you. The LFO 1 LED is generally a soldering problem. Also check to make sure your diodes are all in the right direction and cycle through the different filter modes to see if any of them work or all of them don’t work. That could suggest a specific area to look in. You can send me emails directly to matt@hackmeopen.com.

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