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DaFuRui 4 Channel 5V Relay Module,2Pack 5V Relay Board with Optocoupler Support High/Low Level Trigger for Arduino RelayAmazon$524.40
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Akemy UX433FA Motherboard For ASUS ZenBook UX433FA UX433FN U4300F Laotop Mainboard I7-8565U CPU 16G RAM 90NB0JR0-R00022Newegg$72.99
BIGTREETECH SKR 3 Control Board 32Bit New Upgrade Silent Board Support Marlin/Klipper, DIY 3D Printer Motherboard Support TMC2209 UART, TMC5160T, TMC5160T Pro, TFT35-E3, TFT35, Mini12864 LCD DisplayAmazon$23.72
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Driver Expansion Board, DRV8825/A4988 42 On-Board DIP Switch, Terminal Power Connector, for 42 Stepper Motor Drive, 3D Printers and DIYAmazon$7.99
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Electronics-Salon DIN Rail Mount Screw Terminal Block Adapter Module, for Arduino UNO R3.Amazon$7.99
NOYITO Optocoupler isolation MOS FET 10A DC 2.7-27V High-Power Field Effect Tube Driver Module 0-20Khz PWM Switch Control Board Development Board ModuleAmazon$35.83
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GUETNEU Relay Board, Relay Module 4 Channel 1 SPDT DIN Rail Mount 24V DC/AC Relay Module Board, Interface Relay Module (FY-T734C-D24)Amazon$31.20
Carrier HK61EA003 OEM Replacement Rectifier Control Board for Relay HN61PC002Amazon$10.49
Hailege PCA9685 Servo Shield PCA9685 16 Channel 12-bit PWM Servo Driver Shield I2C Interface for ArduinoAmazon$134.90
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Diitao 2PCS 4 Channel DC 12V Relay Module with Optocoupler Isolation Relay Control Board High-Level Trigger Solid State Relay Module Compatible(12V 4-Channel)…Amazon$36.99
BIGTREETECH DIRECT SKR Mini E3 V2.0 Control Board 32Bit Silent Motherboard Integrated with TMC2209 UART Stepper Motor Driver for Upgraded Ender 3 Ender 3 Pro 3D Printer Control BoardAmazon$376.74
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PCM-9574 REV.A3 100% OK Embedded Motherboard IPC Board Industrial Mainboard PC/104 SBC PCI Slot PC104 with CPU RAMNewegg$107.10
100% for CE-KFR90GW/I1Y CE-KFR70W-21E tested for Midea KFR-70GW/DY-T6 Air conditioning board computer board / circuit boardNeweggSAVE $0.93
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