Phatline Posted January 2, 2023 Report Share Posted January 2, 2023 (edited) Hi, i recently buyed a Akai MPD226... i hoped i could use it standalone with MIDI-TRS/DIN Hardware... but LED Feedback doesnt work (aka Notes from a Hardware Sequencer give no Response to the PADS) - short the Akai Firmware sucks. I made a teardown, searched on the MPC-Stuff website... and made PAD-Footprints for KICAD, made shematic and so on: Result: OpenPAD I dont use the same shematic as Akai did... the multiplexed 4 Inputs of a STM32F103 with some HC595. My goal is to use 2x MCP3208 and connect them without switching to the PADs. SO I HAVE A QUESTION: the akai Resistive Foil - has a resistance from 280 Ohm if you measure diagonal between the corners. Our MCP3208 wants 0-5V. How do i limit the current going thru the Foil, without reducing the 0-5V Range? OP-Amps? how? Thx 4 Input I too have drawn a Core PCB 4 Pick and Place... incl STM32F407VGT6 ;) Edited January 3, 2023 by Phatline Quote Link to comment Share on other sites More sharing options...
Phatline Posted January 10, 2023 Author Report Share Posted January 10, 2023 the quest still is: the akai Resistive Foil - has a resistance from 280 Ohm if you measure diagonal between the corners. Our MCP3208 wants 0-5V. How do i limit the current going thru the Foil, without reducing the 0-5V Range? OP-Amps? how? Thx 4 Input Quote Link to comment Share on other sites More sharing options...
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