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BMC038. Panel Keyboard.

Last updated 11-16-2015

If you have any questions, or need help trouble shooting, please e-mail 
[email protected]

I Overview/Features
II Schematic
III Construction

A.Parts List
B.The Board
C.Calibration
D.Photos/Final Thoughts

Summary of Contents for BMC038

Page 1: ...ated 11 16 2015 If you have any questions or need help trouble shooting please e mail Michael Bartonmusicalcircuits com I Overview Features II Schematic III Construction A Parts List B The Board C Calibration D Photos Final Thoughts ...

Page 2: ...d LEDs and the anodes of the green LEDs so this allows it to control which set of LEDs are active by either being a current sink for the reds or source for the greens Pin 13 controls the anode of the first red LED and the cathode of the first green and Pin 3 does this for the second set This allows us to control 4 LEDs with only 3 pins To the right of these we see the switch matrix Pins 14 through...

Page 3: ......

Page 4: ...4W metal film through hole 8 2K 1 1 4W metal film through hole 10K 1 1 4W metal film through hole 100K 6 1 4W metal film through hole B100K Potentiometer 2 9mm Right angle PCB mount Like this 5K Cermet Potentiometer 1 3296W packaging Capacitors Name Value Quantity Notes 01uf 6 Cheap ceramic disc 10uf 2 2 5mm lead spacing 5mm width Other Name Value Quantity Notes Power connecter 1 Eurorack or MOTM ...

Page 5: ...it to the panel This allows for more give to the parts making it easier to mount and also puts less stress on the PCB during the mounting process After everything is securely fastened resolder these connections then solder in the rest of the connections C Calibration 1 Set up a volt meter with the black lead to ground and the red lead to the CV output jack 2 Turn the octave knob so that only LED R...

Page 6: ...t I just used the clipped off leads from the resistors this saves wire and saves time stripping wires I used bulk two row header clipped off instead of a shrouded header for my power connecter Here s a side view of the completed unit I did not use the washers that come with the pushbuttons if you decide to use them you may need to add washers for the pots as well ...

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