App note: Designing with an inverted-F 2.4 GHz PCB antenna

PCB design guide for an inverted-F 2.4 GHz antenna from Silicon Labs. Link here (PDF) One of the main reasons to use a PCB antenna is to reduce cost. Since the antennas are printed directly on the board, they are generally considered to be free. On boards with room to spare, this will be true. […]

App note: Noise suppression for wireless headphones

Wireless headphone interference investigation from muRata. Link here Recently, the popularity of wireless headsets has been growing as the number of situations where people “play sports while listening to music” increases. Bluetooth is frequently used for communication between smartphones and headsets. However, audio can skip due to communication errors, so countermeasures are required. This is […]

App note: nRF24L01+ 2.4GHz wireless transceiver

The nRF24L01+ ICs are 2.4GHz transceivers that only need a few external parts. They’re controlled by a simple SPI protocol, and two extra pins. The IRQ pin signals when data is available and can be used to wake a microconroller with an interrupt.  The CE pin is an input activates/deactivates the transceiver. 126 channels are […]