latigid on

Both AIN_4 and AOUT_4 are working nicely :). The range switches are especially useful for AIN, but I can see the benefit of alternative AOUT ranges with improved accuracy when used as a mod source (rather than a pitch CV). It seems a good idea to use the bipolar option for pitch, otherwise you'll always be transposing. E.g. I think C0 in MIDIbox land is set to 2.00V?

You're lucky nILS isn't here, or he'd probably charge a stupid question fee (or make a snide remark)

Here's some more! *** Hi, the hardware/case is usually the most expensive part, so you should ask yourself what you're willing to spend. Quality normally correlates with price. You can get a lot of parts from Tayda in Thailand, e.g. Pots (5-10k are good values) Switches (take your pick, normally you want momentary ones, perhaps some toggles or rockers. While cheap, these are considered to be quite poor quality, e.g. the moulding resin tends to melt very quickly during soldering.) It's simple to order under the customs threshold for the EU and you'll normally get your parts within 1-3 weeks. Check on their Face* page for a ~monthly discount of 10-15% http://www.banzaimusic.com/ (Germany) http://www.watterott.com/de/Komponenten/Mechanisch/Schalter-Taster (Germany) http://smallbear-electronics.mybigcommerce.com/ (US)

To clarify the above post: if J2 is used for power, then J17 should be open. For externally powered Cores, I recommend (and will likely consider) the following style of cable (YMMV, not tested yet): http://www.ebay.com/itm/Right-angle-OTG-Micro-usb-B-5pin-male-to-A-female-panel-mount-Screw-Cable-25cm-/381713301841 Heh, just for fun, these are the shipping criteria:

There's another jumper that interrupts the power supplied from USB (J17), so for external supply, J17 should be open. If USB host is unstable, try unbridging the jumpers as described above.

Initial doku for AIN_4 is online: http://wiki.midibox.org/doku.php?id=ain_4

Is your shift button pulsing each quarter note when the sequence is running/ illuminated when held down to change modes etc.? I'm using an F1 Core, so it could be related to that. Did you configure the routing from the MIDI menu? You have 16 nodes to play with. What do you want to send where?

After v4.091 I believe the shift button LEDs on the BLM 16*16+X no longer illuminate. I think this was the case on Saturday, but I can't test today due to my SD card being lost in Munich =). At least with the BLM in test mode the lights work without issue.

Sure thing, hence "not impossible." Everyone can go ahead and design their own DACs, but if there's something similar or even equivalent to one of the existing DACs, integration into MIOS should be easier. E.g. if MAX5500 follows the same code protocol as MAX525 (I need to check), then nothing has to change and it's hopefully no extra work for TK. If the pinout is the same, then I just need to get a chip + adaptor and test it in the current PCB (or Altitude could try with his AOUT boards already prepared for SSOP MAX525).

(T)SSOP plus an adaptor is a good idea. I'm not sure if pre-soldered products may be sold in Europe(?). I would prefer to keep the chip coupled as closely as possible to the PCB (+1 on the dual use pads), but it looks like time is up on DIP DACs as you say. Quad vs. Octal: I'd like to keep the quad layout if possible, although it could be doable to have an octal DAC and two quad control panels. If I can avoid re-routing the DAC board too much I'd be happy :). Hopefully you can read that. MAX5500A: Quad 12-bit ±0.25 (worst case ±0.75) LSB integral non-linearity ±1 LSB differential non-linearity 3.5mV offset error 6 ppm/C offset-Error Tempco Typical -0.3 LSB gain error 1 ppm/C gain-Error Tempco Similar pinout to MAX525 -- in fact looks basically like the same die as MAX525 AD5676B: Octal 16-bit ±1.8 (±3 worst case) LSB integral non-linearity ±0.7 LSB differential non-linearity ?0.75 (worst case ±2) offset error some other parameters are given as percentages cost is the same as 2* 5500 chip layout is a clockwise arrangement: a bit annoying to keep the same order (A B C D || H G F E) not impossible. MAX5590B 'A' variant is not recommended for new designs... not a good sign Octal 12-bit ±2 (worst case ±4) LSB integral non-linearity ±1 LSB differential non-linearity 5/25mV offset error 5 ppm/C offset-Error Tempco ±20/±40 LSB gain error(? 2/4?) 1 ppm/C gain-Error Tempco chip layout is a clockwise arrangement: a bit annoying to keep the same order (A B C D || H G F E) AD5724RBREZ Quad 12-bit ±1 LSB integral non-linearity ±1 LSB differential non-linearity ±6mV offset error 4 ppm/C offset-Error Tempco 4 ppm/C gain-Error Tempco actually a better pin arrangement expensive Once the parts arrive I will need to test the MAX525 AOUT to see if the scaling circuit works well in general. Then we could consider an AOUT_3G (?) module.

AD5734

By no means is it impossible to solder SSOP, but the difference in pitch is significant:

MAX5500 (SSOP) could work.

I see two problems with the DAC8565: no DOUT for serial chaining, and TSSOP is fairly tedious to solder. Those 4 extra bits aren't too useful considering the error of.. 4 bits! I'm fine with designing and testing a replacement if one exists!

We can do better. This was my idea as a touch sensor for acceleration, but in the end I think the cup washers are a bit big: Albs make a clear version of this which looks really nice when illuminated:

Here's a souped up version (intended for Programma): All registers on board. 45 degree styles Room for OLEDs Individual touch sensors, wired to encoder bodies at the moment. A bit hard to capture the LEDs, but I hope you get the general idea. The touch sensors are set to activate the LEDs and they can be "dimmed" using a MIOS CC value. It's very preliminary for the moment, but eventually the idea is to use the touch sensors to turn on the acceleration function of encoders. That needs a bit of thought though.

Hello, sorry but what's NRPN? The key to this (potential) issue is whether a USB host connection from the computer is required to boot the STM32F4 on later revisions. For your standalone case, how is the board powered? If it's via a computer, then I guess the USB connection is still present?

Either side of the duo LED (3-pin). or Erthenvar etc. I think Mouser might even stock them. Anyway, they're very widely available.

Op amps are pretty good amplifiers :) TL07x are quite good "Swiss Army knife" chips and you can generally make an amplifier, mixer, inverter, filter etc. with just a few external components. Depending on where the audio is going, you may want a decoupling cap in there to remove DC offset. ... While I'm here, these are the current PCBs for the "CV toggle." I decided against the toggle switches, because they're too big and you have to pay ~$5 each for decent quality ones. Tayda have cheaper options but they're generally not well regarded. I've opted for push button DPDTs instead; because a centre-off (ON-OFF-ON) isn't possible, I used two per channel and the second pole is used to illuminate an LED, which effectively tells you what range setting you're in. I was also unhappy with the mounting -- too much space and the 90 degree ribbon connectors were awkward. Now the whole thing is 50mm wide with the processing board stacked below the panel board.

The idea is you use: one Control PCB + one AIN -- OR -- one Control PCB + one AOUT (you can't use both in the same "sandwich") The Control is flexible in that in can be configured for either; you stuff different resistors/diodes/solder jumpers, while the SIL headers connect to different parts of the respective PCBs. Yes. Plus a some sort of DOUT (e.g. SmashTV, MBCV v2). MAX525. It is expensive but has proven itself as a good DAC. I soldered two AOUT_NG modules, one doesn't work and for the other, channel 1 is non-linear viz. my SEQ tuning. I don't know if that's a problem with the chip; maybe I overheated it whilst soldering?? But checking on Mouser, MAX525 is one of the cheapest DACs available in DIP. There are a few others, but I couldn't find many (any?) with serial out (Tx). It's still listed in active production and if there's sufficient interest maybe I can look at a bulk order. I'd also like to chat with TK. about a possible MUX/DEMUX board. Thus you might have 32 (64?) inputs for ADC and 32 (64) outputs for DAC using SMP08s, and a 74HC595 to generate chip select addresses. Best,

This is a general interest/info post for a new(ish) CV concept. The green PCBs are 4 channel AOUT and AIN boards. Either one stacks with one blue "Control" board. AOUT: MAX525 based. I realise that @Altitude also has an AOUT in the pipeline, so I want to explain the pluses for both. @Altitude 8 channel more compact (minimum rack real estate) DOUT onboard lots of clocks and triggers US shipping @latigid on more spacious (a bit more ergonomic) switchable ranges (0-5, 0-10, +/-5V) manual fine tune control through hole assembly (no fine pitch SMT) new amplifier circuit with precision references and compensated outputs EU shipping matching panel design with AIN (see below) Status: I have most of the parts on hand, so this should be tested within a few weeks. AIN: switchable ranges (0-5, 0-10, +/-5V) to optimise ADC levels protection against overvoltage (op amp limiting) attenuator -- can set to clip the op amp input for interesting CV shapes! normalisation of the inputs to +5V -- can use pots as manual CV sources 3v3 power from a Core or an onboard Vreg Status: tested as working from an older proto. Waiting on a few parts to complete it. Control: Eurorack compatible Accepts either "Thonkiconn" (PJ301M-12) or PJ301BM jacks 4 channel AOUT or AIN 4 channel gate/trig/clock with LED LEDs are driven from a Schmitt trigger so shouldn't interfere with your power rail 1 clock can be set as an input with CV protection and conditioning (even works with a sine wave!) this conditioned clock can be sent to a Core e.g. MBCV DPDT (7mm) switches to engage the range functions: switch in a resistor to adjust gain settings switch in an offset for bipolar operation (you could have +/-2.5V or even +/-10V if desired) Duo LED to indicate current CV range configurable adjustment pots fine tune with diode deadband for AOUT attenuator for AIN note: the 9mm Alpha pots fit, but I have some "long shaft" versions on order. They have a knurled shaft and pointer which doesn't require a knob. mounting for a DOUT R5 board (see below) Status: needs to be tested with the AOUT and AIN boards, but the mechanical fits look okay. ^^ just thrown together, I suppose shorter standoffs would be possible. My design goal for an MBCV example is 2*AOUT and 2*AIN: 8 CV out 8 gate 8 CV in 7 clock out 1 clock in You'd have 200mm of PCBs, which is around 40HP of Euro space. I expect boards could cost 5-6 EUR each.