Simply playing these back out of the Raspberry Pi’s audio out and into the switch’s IR input through a tiny transistor circuit does the trick. Now they have a networked five-way HDMI switch ...

RFDN03C (DNC Mixer) is IR SSB Mixer used in transceiver application. The process used to design DNC Mixer is 0.1um GaAs pHEMT. This Mixer employs two ...