latigid on

First option is to buy the single version (MCP6001). Next best is to wire the inverting input and output together with the non-inverting connected to a potential between the power rails (e.g. make a 1:1 divider with two resistors). http://www.analog.com/media/en/rarely_asked_questions/RAQ_unused_op-amp.pdf Btw, it looks like you're trying to power your circuit through I2+?

Hi, yes I've seen this, many thanks. I will probably develop a single PCB version at least for my own needs, but community feedback is always welcome :)

You could try the MCP6002 for a cheap trial. In the end it still makes sense to use a bipolar PSU I think.

Note: I've just re-remembered sneakthief's MBCV enclosure in the other thread. It would be good to know if the button layout is optimal. My plan is to use encoders with push buttons, so there's a few extra degrees of freedom.

Hmm, seems like I've forgotten about your case. Meanwhile I've opened a new thread to discuss an all-in-one PCB with illuminated encoders in place of LED rings. I'm interested in how the button assignments are working out.

If you want to use a single supply, choose a rail to rail op amp or bias the input (or just use a bipolar supply, this is a much better idea). The op amp won't swing close enough to the PSU rails for it to be useful, i.e. you will have a constant DC offset.

Name PCB BLM PCB miniCore Case Shift button M2 hardware 4xLED latigid on 1 1 1 1 1 1 Rowan 1 1 1 1 1 1 Phatline 2 2 1 2? 1 1 TK 1 1 1 1 1 1 Altitude 1 1 1 1 1 1 rwo 1 1 1 1 1 1 jojjelito 1 1 1 1 1 1 tashikoma 1 1 - 1 - 1 workspace 1 1 1 1 1 1 flyweight 1 1 1 1 1 1 Grizz 1 1 1 1 1 1 blingy 1 1 - 1 - 1 ganchan 1 1 1 1 ? 1 Macotronic 1 1 - - - - sbm 1 1 1 ? ? 1 Jack 1 1 1 ? ? 1 Total 17 17 13 14 10 15

We've seen the for the time being there aren't any working examples. The LRE8x2 boards are unfortunately not readily available, and there are a few issues with getting components mounted (GLCDs) and at the correct height. I would like to propose an alternative front panel, here are some rough concepts below. The window size is the previous idea, with the frame representing a smaller PCB. Some differences: 1. Smaller PCB. This should fit in a 3U case, just like the SEQ v4 2. Illuminated encoders in place of LED rings. Different encoder layout 3. GLCDs mounted above SCS and accessed with the same buttons 4. All DIN(/DOUT) on board. Optional open collector buffers (7407) or other level shifters to allow for higher voltage gate/clock signals. Illuminated encoders would be something new for MIDIbox. These would consume less power and DOUT pins, and require only one hole per encoder. Metal panels would be an option. I would have to check the illumination and quality before committing to a design. Two methods of controlling them are either special PWM code through a DOUT (about 4 levels per colour) or a dedicated PCA9635 (or other) driver running off the I2C buss (256 levels per colour). TK notes that the update rate would be slower with the second option, although the PWM clock is 1 MHz. Encoder types could be RGB or RG, this is something to discuss. With a custom PCB we can have a purpose-built front panel, so I welcome proposals for encoder and button layout. People familiar with MBCV should note what the most important/useful functions are and we can go from there.

Name PCB BLM PCB miniCore Case Shift button M2 hardware 4xLED latigid on 1 1 1 1 1 1 Rowan 1 1 1 1 1 1 Phatline 2 2 1 2? 1 1 TK 1 1 1 1 1 1 Altitude 1 1 1 1 1 1 rwo 1 1 1 1 1 1 jojjelito 1 1 1 1 1 1 tashikoma 1 1 - 1 - 1 workspace 1 1 1 1 1 1 flyweight 1 1 1 1 1 1 Grizz 1 1 1 1 1 1 blingy 1 1 - 1 - 1 ganchan 1 1 1 1 ? 1 Macotronic 1 1 - - - - Total 15 15 10 14 10 13 FYI, you can keep the table tidy by using the code "< >" formatting. The shift button and M2 hardware are now maxed out. If you're still interested just put a question mark on these and if it goes over 10 I'll consider ordering more.

Please see post above: if you don't fit into a multiple like 10, 15, 20 PCBs etc, then you can go onto a waiting list for the next batch. Let's see how many are requested. Looks like a big trip to the post already! Likewise, no problem for more PCBs or cases. The PCB you will get will be a new revision.

No limit to the number of cases! PCBs may be subject to certain multiples, e.g. 10,15,20 etc.

Getting closer:

No problem, I will try to accommodate everyone as best as I can.

Perhaps a question for TK: there is a small amount of "ghosting" e.g. when a sequence is running one LED is dimly lit 8 steps behind the current one. Was this ever seen before? It isn't bright enough to make it through the silicone button but I should mention it and wonder if there's a possible hardware (or software) fix before going for a new board rev. In terms of current, running the entire 16x16 group illuminated blue (i.e. step active) draws about 560 mA. Thus it would be good to have a high current PSU feeding the SEQ; for example, I have a Meanwell 2.5A switching PSU for my 5V line. Unless your musical tastes are quite different to mine, it should usually be around half of this. I did add an extra header for power, and could add a second hole for a connector on the case if requested, if your existing SEQ PSUs aren't juicy enough. Please let me know in advance if this is needed.

Great, please sign up here:

Hmm, there's a few examples of LED driver ICs too: MAX7221 is $10 oer chip... TLC5940 is $3-6 but PDIP marked as end of life. Also Ander's crazy Station, using PCA9635 ($2.50 in TSSOP):

Thanks Thorsten for the firmware updates to get it working and the brilliant platform to begin with! Looking forward to those other modes, whatever they turn out to be. Och, I should say that I can either take payments via SEPA transfer (I think that's free) or PayPal. But in the latter case I would have to add 4% fees... Just to clarify availability: I'm assuming a new run of 10 PCBs with minor trace fixes, but I might build just one more to be 100% certain... Let me think about this. And I only have 9 pieces of the M2 hardware left, which can be found in hardware stores or easily on eBay from Bolt Base. It's just for convenience's sake, and I won't need them for other projects. I think the white LEDs for the sliders work well with the Blue/Green/Cyan colour scheme, but if you like you can get other colours like red, green, orange (TTSH) etc. as standard directly from Mouser. It's no problem to do a larger PCB run if the demand is there.

The preferred way is with the BLM port on a quad IIC module. This combines MIDI in, MIDI out and power connections on a DIN8 socket. There's a matching DIN8 on the BLM case; I've wired up a DIL10 header to go to the miniCore board. You can also use a DIN MIDI port on the SEQ, just connect and define which one you use. This is how I've tested mine because I can't easily get a hold of the PCB mount DIN8 to complete the quad IIC.

Depends on how many encoders one wants to cram on a panel :) Is 16 enough? (Fairlightiii used 43 mm spacing on a 342 mm PCB)

For the programming I suppose there are benefits in avoiding matrix routing (also easier for PCB routing, just use separate DOUT pins for each LED). And for the space, couldn't we use Waldorf-style clear knobs? I imagine some room could be gained over the LRE8x2, even by staggering the encoders (i.e. offsetting a row horizontally). BTW, if someone would like to do the programming, I'm keen to do the PCB, maybe for a "Wilba-style" all-in-one MIDIbox CV v2. It might include 16 encoders with switches, CLCD, 4xGLCD and a few extra buttons. If not, maybe this would be a good place for me to start :).

Post a photo? Maybe it can be salvaged with a few wires?

Please update the following table as appropriate: Name PCB BLM PCB miniCore Case Shift button M2 hardware 4xLED availability 9 9 - 12 9 20 latigid on 1 1 1 1 1 1 Total 1 1 1 1 1 1

This is a bulk order thread for the BLM I've designed. Please post here with the quantities you desire. I will leave the order open until Sunday July 26. Note that I will give preference to those ordering both the PCB and case as the main goal is to have a complete system at the most affordable price for all. The original concept is here: Here is a rundown of the costs in USD: PCBs: Main BLM PCB: 75 miniCore PCB: 4 Mouser components (available soon as shopping carts): BLM: 247.97 miniCore: 9.49 (excluding PIC, available from SmashTV) The main cost of the Mouser cart is LEDs. If groups wanted to order over 1000 pieces then savings of around $45 are possible. Also the red LEDs are somewhat cheaper. Buttons: 18 pieces of 4x4: 108, depending on where you order from. single shift button: 1 These are available from adafruit and various other sellers like flikto.de. There are discounts available, but one has to order over 99 pieces... 3 mm acrylic spacer from Formulor/Ponoko: ~55 depending on where you order from. Case, including shipping to you worldwide: 285 (>4 pieces) 250 (>9 pieces) I will have to add a few extra studs to increase stability, so it's possible that these might be a few dollars more. Hardware: M2 grub screw, washer and nut in stainless steel: 1 20xM3 washer and nut ~3 4xwhite square LEDs to fit Bourns sliders: 1 Shipping is ridiculous from here. I will post when next travelling to the EU Estimated cost: CH: 12 or pickup DE: 12 EU: 25 International: 28 Payment can be made by bank transfer or PayPal (with fees paid or 4% added for the latter)

Case pictures: Update: Communication to miniCore working well I still have a few issues with MIDI IO 3, but it works fine through MIDI IO 1 Case looks fantastic and is perfectly strong enough. I believe that the top and bottom bend radii will increase the strength significantly. The grey powdercoat colour provides a nice contrast with the buttons. PCB flex is no problem in the centre and the north/south edges but a bit flimsy on the left edge. I should have included the blind studs here as they are barely noticeable, and will definitely for the final case. For mine I will find a different way to stabilise it. There are a few PCB errors and I think at this stage it's best to just go with new PCBs. I will start a new thread for confirming orders.