And it’s Done, Tagged onto my JLC order 
Will Be cool to see how it sounds.
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Maybe it would be good to add somewhere on the schem, that the original schema and code come from YMNK.
btw i think that “Note Out” jack socket will be a better description with “CV out”, this module don’t make sound like a VCO, just send some voltage.
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Had the same thought about “NOTE OUT”. It also bugs me that the output is to the left of the input. And I would’ve put individual labels on the note switches. But these are minor quibbles.
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Note-Out - True, the original Schematic shows “Pitch Out” I just changed that without thinking much on it
Everything (Schematic, PCB, Panel, Code ) will be credited to YMNK once checked and functional with my revisions, Then I will release the GIT.
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#Realisation Sets In…. "I was going to label them… I could not determine from the code or the schematic what the top row of switches was for /#Realisation. Yes now I realise that he said Keyboard, and they are not spaced oddly but are laid out like a keyboard DOH! DOH!!!
Well that will be sorted for the next version . … and I can swap the Jacks.
In fact I think the next version will be a bit different ( PB86 push buttons with LED’s, a duino MegaPro that can save the button state…) …
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Not forgotten,
The switches have been changed to “switched to ground” and the code will be changed to use “INPUT_PULLUP” which provides internal pullup resistors instead of using the external pull down ones.
Cheers
Rob
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ok sorry, thanks for the explanations
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Hi Guys! ymnk’s here 
Wow, I’m so happy that some of you will build this thing! I’m actually very proud of it, and I use it in all my music cause it is soooo convenient.
About few remarks :
- I didn’t know about the INPUT_PULLUP thing! What a crazy thing, it can saves me a dozen of resistor in different projects! Does this works with Analog inputs too?
- I spent a some time finding a good solution to protect the clock input, but since I am a total beginner in electronics, I think I will keep in mind the the 1N5817 solution!
- PB86 push buttons! Yes, it will be an awesome update for the next version!
- About the 78L05 thing … someone also told me that you don’t actually need this. So you just have to wire the 12V to the VIN input instead?
BTW, thans to Dud for posting this here! Really appreciate the sharing!
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Welcome, and thanks for sharing your design!
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I use this picture as a guide.
The VIN on the right is the one that uses an on board power regulator and accepts 7 to 12 Volts DC.
DO NOT USE the 5V pin for that kind of voltages. Conversely, if you have a power supply which delivers 5 V DC, then do NOT USE the VIN input. In that case use the 5V input.
It appears that an analog input on a nano can either route the signal to an ADC or it can be treated like a digital input having an optional pullup resistor:
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Except for A6 and A7 which are analog only.
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wow, thanks for your answers
Ok I get it for the VIN. I will update my blueprint!
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Yeah, thanks for sharing. I t sounded cool
The Input Pullup seems to be less well publicised than it should be.
Personally I stick with the VoltReg, but each to their own.
I like the idea of using the PB86’s with twin LED ( one for “selected” one for “playing” ) and writing the settings to EEPROM to restore after power cycle… I have ordered 10 each in white and black … It will use more I/O so would have to use a “Arduino Mega Pro” …
Really interested to see what can be done 
Cheers
Rob
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If you are using a nano clone then using an external 5v reg is not a bad decision as it is a component they often cheap out on to save a few cents
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just noticed this morning that the clock input buffer is missing the pad connection between the diofdes and resistor… easy bodge to fix.
I have refreshed my memort on how to store bytes to eeprom, this will be critical on my next version using non latching push buttons.
The DAC boards arrived the other day, and the PCB’s left the airport in china on the 15th…
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Hello everyone, first post on this forum.
Hope you don’t mind a question.
Being still a noob at Arduino I’d be interested in learning how I can change the inputs to pull-up so to omit the resistors.
Also, if I’d like to build it using a bare 328 I would be missing one pin as A6 and A7 are not present, could I change the mode selection toggles with one potentiometer to select the different modes, could someone enlighten me? Many thanks in advance
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Are you asking how you can enable the internal pull up resistors for an input pin on an Arduino? This is all you need to do:
void setup() {
pinMode(pin, INPUT_PULLUP);
}
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Hey Caustic,
Many thanks for getting back.
I have poorly written my question, my apologies.
I’m interested in knowing which bits of the specific code discussed in this thread needs changing.
My initiaL guess are those two bits of code to specify the INPUT_PULLUP?
And change the digital read to LOW?
for (int i = 2; i <= 13; i++) {
pinMode(i,INPUT);
}
for (int i = 2; i <= 13; i++) {
pinMode(i,INPUT);
int n = 13 - i;
//I inverted pin 6 and 5 ... shame on me
if (n == 6) {
n = 5;
} else if (n == 5) {
n = 6;
}
notes[n] = digitalRead(i) == HIGH;
}
Thanks