#24

That is awesome!!!

Great to see the ProtoVero boards in your case too.

Good luck on your continued progress!

b

3 Likes
#25

@lijnenspel This is awesome, I’ll definitely be interested in a pcb (and panel if you are making one)!

I am myself designing an OSC to CV module, I was planning to use the new teensy MCU and LTC2668, which is 16-Channel, 16-/12-Bit DAC. It also has switchable voltage ranges and buffered outs so it doesn’t need much in terms of external circuit. The advantage of your solution is the ability to reconfigure an output to be an input, which I haven’t thought about.

My plan is to use it mainly with PureData and also for live performance using Lemur App (on a 23" flat screen with one of those cheap android TV sticks).

EDIT: Also though it would be good to include a PWM controlled LED with each jack socket, to show input/output voltage. The LED could be two colour for negative/positive voltages. All LEDs could be driven using one of the I2C chips with multiple PWM outputs.

EDIT2: Haha I just noticed on your buildblog you decided to add LEDs too, though you’re going for an analog approach. Personally I would avoid that approach altogether (to cut down on external components) and just use I2C chip like Tlc5940 (16 PWM outputs - I haven’t found one with more outputs but 2 can be chained together).

1 Like
#26

Super interested indeed!

#27

tidal support :o

super interesting

#28

Thanks! Yeah was thinking of going doing the led driver route. The problem is that it becomes more diy unfriendly because DIP packages will be too big, so smd is needed. Don’t mind presoldering some though. Need more than 16 channels and i2c so thinking of the PCA9956B.

You good designing pcbs? I could use some help when I’m a bit further and tested the current prototype more :slight_smile: Still need to test things like throughput and io protection of the maxim chip.

#29

Hey, I don’t have much experience with SMD but I think I am ready to take a plunge! I designed a couple of PCBs before and they turned out ok (after a couple of iterations). For eurorack pcb design I found it very beneficial to study Music Thing Modular and Mutable Instruments designs, also Neutron Orgone Accumulator schematic/PCB.

I should have a bit more time at the beginning of February once I get some projects out of the way. I would be very interested in working with you on this device.

I am also designing an OSC controlled passive vactrol matrix mixer (teensy driving DIY vactrols using one of those I2C PWM chips) - I have already learnt a bit from your work so far.

I thought about avoiding WIFI as it is supposed to be really temperamental in some environments (for examples venues with dodgy electrics, areas with many wifi networks etc). It might be worth including some kind of provision for ethernet connection (even if on a small optional daughter board).

1 Like
#30

:raised_hand: Very exciting!

#31

following with interest.
no diy skills whatsoever, though.

#32

interested as well :+1:
no diy skills either :-1:

#33

any updates @lijnenspel ? :slight_smile:

1 Like
#34

following with interest!!

no DIY skills to really speak of. but i could MAYBE get it built myself with a good guide?

#35

hellll{llllllll} yes

#36

very interested in that one !
how far are you from a kind of working proto over wifi osc ?
possible to participate in some ways ?
i am in berlin this week by the way !

#37

Small update! Been getting a lot of help from the awesome @mots and his software is already looking great with LFO’s et al! Still working on the pcb and havent order a test batch yet. PCB probably won’t be DIY friendly unless I’m going the presolder of the two smd IC’s route the rest is through hole.

1 Like
#38

Sounds great. Still following with anticipation.

#39

Any updates regarding this project? I am full of ideas to utilise this piece of hardware, especially with PD and TidalCycles. I was also wondering if there’s any chance to stack 2-3 of them?

1 Like
#40

hi all,

yes some updates ! indeed.
i have been busy on this project and i am happy to share that the proto i built works quite okay at the moment.

unnamed.jpg720×1280 103 KB

the proto on a train

the proto consists of :

the code is there https://github.com/hdavid/ports

in total this sum up to about 60 euro. very decent for 20CVs

what works :

  • osc messaging
  • output in 0 +10volts
  • cv are enough to control modulation, but not precise enough to control pitch (but could work i guess if scaled down to a smaller range like an octave)
  • lfos
  • triggers
  • link clock and reset

what does not work

  • jitter / latency (of the wifi + pi) is too high to allow for precise triggers.
  • link reset is not working as it should

but all in all it is really fun to play with it already !
oh, i almost forgot ! it is piece of cake to put together :slight_smile:

cheers

4 Likes
#41

Great news. I thought you said it was not going to be a piece of cake :slight_smile:

Are you planning to share the schematic aswell?

#42

Hi @cannc ,

for the final PCB, @lijnenspel can say as he is working on that :slight_smile:

As for the wiring of the proto, it is really piece of cake.

the “hard” it for the pink-0 part, there i just copied the clock reset part from there https://github.com/shaduzlabs/pink-0/blob/master/hardware/pink-0.pdf it is just 4 resistors, 1 cap and one transistor. (they are hidden under the pi on the picture). that said the proto can work without pink, this is totally optional.

As for 20 cv outs : it is dead easy! ground, 3.3v and SPI (mosi, miso, clock, and device select) between the pi and max11300 board. (it is the coloured wires you see on the pic). Then the board itself does all the job, and i have the outputs of the max11300 board directly wired to the jacks, one by one. At this level this is more electricity than electronics :slight_smile:

1 Like
#43

Was actually being lazy and waiting for the final pcb this whole time :slight_smile: guess gonna have to dig it myself unless @lijnenspel has any updates?