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This is a breakout board for the very handy 16-Channel Analog/Digital Multiplexer/Demultiplexer CD74HC4067. The board also breaks out the chip’s “enable” pin, which when driven high. (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.