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Some devices use the extra conductor for a microphone (like hands-free headsets) or to carry a video signal (like in some MP3/MP4 players) If you’re hacking on something that has a 4-conductor audio jack
25 super bright red LEDs
This little breakout is built around the FT232RL IC from FTDI
panel-mount momentary switch
Datasheet (TPA2005D1)
SparkFun RFM69 Breakout (434MHz) Boards, General Tattoo Inks Some devices use the extraThis is the SparkFun RFM69 Breakout, a small piece of tech that breaks out all the pins available on the RFM69HCW module as well as making the transceiver easy to use. The RFM69HCW is an inexpensive and versatile radio module that operates in the unlicensed ISM (Industry, Science and Medicine) radio band. Its perfect for building inexpensive short range wireless networks of sensors and actuators for home automation, citizen science and more. This
