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DonCon2040/pcb/DonConIO
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Frederik Walk d82f751701 Update IO Board Readme
2023-08-09 21:58:24 +02:00
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README.md

DonConIO - Signal Conditioning for the DonCon2040

This board hosts a Seeed Studio XIAO RP2040 microcontroller unit and provides signal conditioning for the piezo drum triggers. The conditioning circuit is reverse engineered from the V260 SIF PCB found in the original arcades. This is also the main reason why this board uses mainly through hole parts ... for authenticity.

DonConIO PCB

Sensors

The arcade drum uses Sensatec GSS-4SD piezo impact sensors. While those are only available as expensive arcade spare parts, the GSS-4SA and GSS-4SC variants used in this build can be readily ordered directly from the manufacturer. My guess here is that the D variant only uses a different cable and connector, but who knows ...

You can also try your luck with any generic piezo, in this case you might have to tune the filters and amplification factor.

Note

This board does not use the internal ADCs of the RP2040 since those are pretty noisy and have a static offset of around +25mV. You can however still skip the external ADC and level-shifter and connect the signals directly to ADC pins of the XIAO RP2040 if you want to save some cost.

Bill of Materials

Reference Description Digikey Part Notes
J6, J7 Seeed Studio XIAO RP2040 -
U1, U2, U3, U4 TL072CP JFET OpAmp 296-1775-5-ND
U5 MCP3204 12bit SPI ADC MCP3204-CI/SL-ND
U6 MCP1541 4.09V Voltage Reference MCP1541T-I/TTCT-ND
U7 TXB0104 4-Bit Bidirectional Voltage-Level Translator 296-21928-1-ND
PS1 +/-12V DC to DC Converter 2725-A0512S-1WR3-ND
C1, C3, C5, C7 1nF Mylar/Polyester Capacitor 493-14299-ND
C2, C4, C6, C8 0.47µF Tantalum Capacitor 478-1901-ND
C9-C16 100nF Ceramic Capacitor BC1084CT-ND
C17 4.7µF Electrolytic Capacitor 1189-1421-ND
C18, C19 1µF Electrolytic Capacitor 50YXJ4.7M5X11-ND
C20, C22, C24, C25 0.1µF SMD Ceramic Capacitor 1276-1003-1-ND
C21, C23, C26 10µF SMD Ceramic Capacitor 1276-6454-1-ND
D1, D2, D5, D7, D8, D11, D13, D14, D17, D19, D20, D23 1SS133M Small Signal Diode 1SS133MR0GCT-ND While the 1SS133M is probably more authentic, a 1N4148 will probably just work as well.
D3, D4, D9, D10, D15, D16, D21, D22 BAT43 Schottky Diode 112-BAT43-TAPCT-ND
D6, D12, D18, D24 1N5229B 4.3V 500mW Zener Diode 1N5229BFSCT-ND
R1, R10, R19, R28 1MΩ Resistor 13-MFR-25FTE52-1MCT-ND
R2, R11, R20, R29 4.7kΩ Resistor 13-MFR-25FRF52-4K7CT-ND
R3, R12, R21, R30 100kΩ Resistor 13-MFR-25FRF52-100KCT-ND
R4, R13, R22, R31 100Ω Resistor 13-MFR-25FRF52-100RCT-ND
R6, R15, R24, R33 5.1kΩ Resistor 13-MFR-25FRF52-5K1CT-ND
R7, R16, R25, R34 10kΩ Resistor 13-MFR-25FRF52-10KCT-ND
R8, R17, R26, R35 1kΩ Resistor 13-MFR-25FRF52-1KCT-ND
R9, R18, R27, R36 300Ω Resistor MFR-25FRF52-300R
R37 10kΩ SMD Resistor 2019-RK73H2ATTD1002FCT-ND
J1, J2, J3, J4 2Pin S2B-PH-K-S Connector 455-1719-ND PHR-2 plus SPH-002T-P0.5L is the counterpart
J5 5Pin S5B-PH-K-S Connector 455-1722-ND PHR-5 plus SPH-002T-P0.5L is the counterpart