MFOS Mini-Controller circuit

  
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This circuit is identical to the one in the Single Buss 1V/Octave Keyboard Controller. See the circuit description there. This board has the addition of the resistors used in the keyboard voltage divider. Whereas in typical keyboard pressing a key brings the resistor divider in contact with the main buss we bring the bus to the divider via the probe used to touch the PCB pads
MFOS Mini-Controller circuit - schematic

that represent the keyboard. As you can see in the photos above I combined the MFOS Wall Wart Power Supply with the MFOS Mini-Controller and also fed the +12V, -12V and Ground out via banana jacks so I can power my Sound Lab Mini-Synth. It is very convenient. You only connect the PCB points shown here and of course KBUS to the banana jacks so you can connect the wand to them. There are several PCB connection points that are not used unless you score a real keyboard and then use this board to build a regular keyboard. Then you might want to use TLA (Trigger LED Anode), GLA (Gate LED Anode), and KBTP (keyboard top) as described in this article Single Buss 1V/Octave Keyboard Controller. As far as the Mini-Controller circuit is concerned when you plan to use the touch pads everything is already pre-connected on the PC board and you just leave these as they are. You only connect the PCB points shown here. There are several PCB connection points that are not used unless you score a real keyboard and then use this board to build a regular keyboard. Then you might want to use TLA (Trigger LED Anode), GLA (Gate LED Anode), and KBTP (keyboard top) as described in this article Single Buss 1V/Octave Keyboard Controller. As far as the Mini-Controller circuit is concerned when you use the key-pads everything is already pre-connected on the PC board and you do not need to connect the PCB connection points you see here with no wires going...



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