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[title] Bluetooth
-[* green] the bluetooth chip and antenna (I had to remove a metal shield to reveal the chip;)
-[* violet] the bluetooth chip, in this case the nRF51822 Nordic Semiconductors (It’s a 2.4GHz ultra low-power bluetooth chip built around a 32-bit ARM® Cortex™ M0 CPU)
+[* green] The bluetooth chip and antenna (I had to remove a metal shield to reveal the chip;)
+[* violet] The bluetooth chip, in this case the nRF51822 Nordic Semiconductors (It’s a 2.4GHz ultra low-power bluetooth chip built around a 32-bit ARM® Cortex™ M0 CPU)
[* orange] To the right of the nRF51822, you can see two oscillators, one 16MHz and one 32.768kHz (marked in orange), which generate the clock waveforms for the CPU
[* yellow] On the bottom (marked in yellow) you see the antenna circuitry and the PCB antenna itself. As you can see, they did not use a balun chip, but instead created a matching network using some capacitors and inductors.