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Maybe TL07x op amps have a limited voltage swing. Check that the output can reach 13.81 V with (I assume) +/-15V power supply (from the data sheet it looks like it should). +/-18V might have more headroom but is pushing the maximum specs.

Looks like R16 is not soldered correctly?

It's a good fix and totally okay from an electrical perspective. You're essentially multiplying by a different number as the DAC doesn't give the correct range by itself.

No worries, you provided good info (voltages and pictures) and had a decent attitude. If it works, we're very happy!

Ah yep, set dout x 0|1 is the correct syntax. You could try the same on the second 595 chip, these would be dout 8--15. You've copied the same terminal data each time, but I assume you turned the correct outputs on and off. Note that pressing the up arrow on the computer keyboard will go through a history of the terminal commands.

Thanks for the voltages, so the issue seems to be on the sink side of the matrix. As you're troubleshooting the _L board and the _R board works fine, it would seem as though the data is getting though correctly. Could you try the following commands in MIOS terminal: set dout d0 1 %turns first output on set dout d0 0 %turns first output off set dout d7 1 %turns eighth output on Here you manually set the pins, so this can rule out any errors from the software side. You can also try it with the .NGC loaded. When d0=1, the first four encoder switches should work when pressed. set d0=0, then d1=1 should allow the first four Matias switches. If the component values/types, cabling and soldering are all sound, then I'm beginning to suspect a dud IC. Could have been overheated or subject to static for example.

I don't actually know the capabilities of the Cirklon. You can find the feature list here and see if it fits your style? The SEQ is best if you can DIY, but we know of instances where others have offered units prebuilt. The SEQ has different track types that are either monophonic with lots of trigger or parameter layers, or polyphonic that simplifies the sequence to notes. I don't know what you mean by accumulators. You can use so-called loopback tracks to control other tracks. Watch the latest demo by TK. (ucapps youtube channel) Track 13 looks to have a slow clock divider that transposes other tracks

It might be interesting to solder down the superflux cathodes, then you could check if the problem is on the sink side or the DIN side. IC2 is the sink side of the matrix; you can see the sink part of the matrix here on the left. MIOS pulses each output in turn and this allows the switches to conduct to 0V when pressed (also lighting LEDs when that column of LEDs is on). This registers as a switch press in MIOS by the 165 inputs going low. IC3 is the DIN part of the matrix. D0-D7 represent the switch columns and there are eight per board from left to right. D0-D7 connect to the anodes of diodes located above Matias switches and beside MEC switches. As you have a functional lemec board, you can compare voltages on the two. The only difference with the _R board is that there are three extra shift registers (74HC595) at the start of the chain. Because you have some activity with encoders, the issue lies with either the DIN or sink side of the matrix. Do all encoders work? If so the SC, RC2 and SI lines are all fine. Check that the correct resistor networks are installed (also the orientation), check that you have +5V on all aforementioned 4148 diode anodes,

Soldering looks clean and it's correct to omit IC6 and R17/C7. Software-wise, how are you testing? Are the boards chained left to right or did you test each one separately? Using the _L configuration will not work if the first board is _R as the matrix is offset by three SRs. Hardware ideas: the transistor types are wrong or swapped, mixed up with a BAT diode etc. For the missing encoder, on lemec with the plate removed, check J3, 8th pin from the left, to pin 5 on IC5, 9th pin to pin 6, respectively. The pins should have +5V on them. If you (carefully) short the pins to 0V, do the encoder/DIN events trigger? If not it could be a cold solder joint or a short to 0V (e.g. IC5, pin 8). Now connect the plate PCB. You should have continuity back to IC5. If not, check that the pin header makes good contact with the through-board header.

Very good! At a guess, R26 is missing, or IC6 is installed without R17/C7. Presumably you haven't tested LED functions yet? I can provide more help when I see a picture of the board. Do the encoder pins contact the pin header below? Try trimming the pins, also isolate with a bit of tape.

Have you tried restarting MIOS Studio between updates? Jumper settings appear correct. You can also measure resistance between the USB B port (with power off) and PA11/PA12 on the socketed Waveshare MCU breakout, should be 22R.

Thanks for the nice feedback! Best of luck with the remaining pieces!

At first, maybe try to keep J3 jumpered and see how the performance is. You can think of the J8/9 SRIO chain (or J19 SPI) like a power buss, so if there is a power supply connected to the cable, the chips on the line driver will receive power that way. But if you think of where that power comes from it goes all the way back to the Core USB connector. Thus there is the option to unjumper J3 and supply the MIDIbox buss internally (like in a Eurorack case). This was not thought through extensively before, which is why I've designed something much more suitable for racking in a case, with lots of different power options (still needs testing but should be available soon). One option for a separate +5V is to put the J19 connector somewhere in the middle of your ribbon. The first four wires are 0V|0V|+5V|+5V, so if you have a PSU handy you could connect those there. J3 should be unjumpered in this case. AOUT_NG would share the same +5V. This buss-power regime is not optimal, but it seems to work okay. Better would be to "star wire" each PCB back to the source PSU; that way the return currents should interact less.

Hi, Actually, your usecase is more like this: As no serial inputs (switches) are used, the J2_SI setting is not important. If you use an AOUT_NG, then JAOUT offers 1:1 pinning, but it overlaps with the LINE_RX J19. The pinout is as shown in the ucapps schem. If you've already soldered J19, you can rearrange the ribbon cable as shown: Thereafter use the top row (opposite side to the notch in the header) to connect to AOUT_NG J1. The other side is connected 1:1. These days I would put the black cable on the other way, but it doesn't really matter. For midiphy LINE_RX, I recommend to use a dedicated +5V supply and leave J3 unjumpered. The ICs use quite a lot of current (100 ohm terminators), which isn't transmitted well down a DB-25 cable. Any other questions please ask.

Peter can correct me if I'm wrong but the workflow is: Clip: a recorded passage of notes (maybe data) Track: where clip data is stored. There are six tracks per scene Scene: a collection of six tracks. Mute states will also be stored, so you can build up layers dynamically. One workflow is to copy clips onto different tracks and flick between scenes to create variation. E.g. if you wanted to drop out all of the tuned instruments and keep the drums going, then build up the parts manually by unmuting them (could also be done within a single clip). Or copy the track and transpose a perfect 5th etc. I would say it's not meant to be a whole DAW in a box. The idea is to use it as a quick "sketchpad" jamming tool, although Peter has come up with some very inspiring songs using not much more.

Thanks for sharing! Has a bit of "Saturate" vibe going on. Did you slave the 909 or sequence from the v4+?

Thanks for the photos. From the looks of it, you didn't use that much solder on the LEDs. Did you try reflowing them? What is the forward voltage of the LED? If it is too high, it could indicate that the soldering temperature was too hot. As everything else works, I don't see how it could be anything else (maybe a broken trace or pad shorted to 0V). Just swap the LED in this case. Hence: manually connect the column of the upper red LED to the lower one. If the LED lights, then there is a missing connection between RJ6_1 and the LED. Also test for continuity between the red anode pad and 0V (ground). Relevant parts of the schematics attached.

A photo would be useful. So the other LEDs of the column light up? MEC and the other superflux? Also nothing else gone in the row? Is the cathode pin correctly soldered? Do the DINs work? When you say you've isolated the LED, you removed it? Did you try one of the spare parts? You could try to temporarily short to the other red LED in the column or the adjacent cathode in a row.

I updated the midiphy BOM tool to reflect the "single quantity" Mouser item. I think this wasn't the case before (as I've ordered single quantities using the same part/link), so my bet is Mouser "updated" that part to require MOQ 25. Did you ask them if you can return them for a refund or credit? Once again, sorry for the trouble! You could have a whole studio of equipment with your Cores in one corner and the control surfaces in another :).

Interesting, as the following part can be ordered in single quantities... perhaps they changed it recently? https://eu.mouser.com/ProductDetail/Texas-Instruments/MC3486N?qs=sGAEpiMZZMsY34Xj74lW5jRIn19E3hK9zaKqQ%252ba%252bP%2f8%3d The BOM module is updated with this part. Sorry that you're loaded with so many!

Digikey has lots of stock, Mouser looks to receive a delivery on 2018-02-04. If it's super urgent, consider buying the 11-pin version (MDF7-11S-2.54DSA(55)). It might work just to offset the pins one row, but another option is just to cut the edge/last position off if it gets in the way of the mounting hardware.

11 goes to the nearer encoder leg. If it's more convenient, just bridge the encoder leg closest to the RN to pin 9 on the resistor network. As long as the bottom trace is still okay, the pull-up just goes the long way around.

The good thing about the resistor networks is they aren't hugely sensitive to heat. CMOS chips on the other hand... I would also recommend a hot air station. I have something similar to what Bruno linked, but the fan is in the main box rather than the "nozzle". They're useful for other things too, like desoldering (or soldering) large metal parts like heatsinks, pin headers or jacks, or when the PCB designer doesn't use thermal isolation pads on parts attached to the 0V plane. I even made crème brûlée with it once!

This could work too. Though, there may be a risk that you end up ripping of the SMT pads with the force. You could ask @rbv2 as he had the same issue. A lot of solder/Chip Quik? Maybe even using a lot of solder to immoblise each pin (effectively binding each pin together with solder or even using scotch tape), then clipping?

Desoldering tips for FM chips.