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This is a breakout board for the very handy 16-Channel Analog/Digital Multiplexer/Demultiplexer CD74HC4067. “On” resistance: 70 Ohms @ 4.5V. (COM in the schematic, SIG on the board)to one of 16 channel pins (CHANxx).
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.