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10MHZ 8-Channel NPN/PNP to NPN 5V/24V Square Wave Signal Conversion Level Converter Module: Amazon.com: Industrial & Scientific
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Amazon.com: NPN PNP Signal Converter, MRI-24TR/INV PLC Sensor Polar IO Level Conversion Module, PNP to NPN Signal Converter Relay : Industrial & Scientific
ASI XNPNPNP Sensor Signal Converter for DC Logic Signals, NPN to PNP, PNP to NPN, 12 mm Wide (Pack of 5): Amazon.com: Industrial & Scientific
NPN to PNP Level Converter, Keenso 4-Channel Signal Conversion Level Converter Wide Voltage 10-28V: Amazon.com: Industrial & Scientific
Amazon.com: Icstation 24V to 5V 8 Channel PLC-PNP Signal Converter, Optocoupler Isolation Board, Voltage Level Converter Module : Electronics
Amazon.com: NPN PNP signal converter, MRI-24TR/INV NPN PNP Signal Converter PLC Sensor Polar IO Level Conversion Module
Slim DIN Rail Mount NPN to PNP/PNP to NPN Sensor Logic Signal Converter Module: Amazon.com: Industrial & Scientific
Signal Converter, NPN PNP Signal Converter, MRI-24TR/INV PLC Sensor Polar IO Level Conversion Module: Amazon.com: Industrial & Scientific
Npn to Pnp Level Converter,8-Channel Npn to Pnp Signal Converter, 8-Channel Optically Isolated Module for Npn to Pnp Level Conversion Wide Voltage 10-28V: Amazon.com: Industrial & Scientific