Hi,

I'm looking for someone with an ability to explain the process of turning sound into an infrared signal.

I have a remote that operates at 36kHz, using a ceramic resonator, that I am in the process of building. Anyone know what type of electronic microphone (built into the board) can channel sound from my computer and convert it to electricity which then passes through a 36kHz resonator then to the led, creating the infrared signal? The sound will be 1.125ms in length. Any specs behind the sound that are needed - wavelength, amplitude, etc?

I want to plug it into my computer with a giant extension chord with an ir blaster for a school project. I'm just stuck on the turning sound into energy part of the equation.

Thanks for some unpaid support. I'll try and return the favor some day.

 

sound --> microphone --> preamp --> AM --> LED driver --> LED
http://en.wikipedia.org/wiki/Amplitude_modulation

You can do AM with multiplier chips, by varying an RF amp supply voltage, and I'm sure there are others.

 

AM or FM Modulation of the 38kHz carrier would work, most radio circuits could be used for a rough concept of either modulation/demodulation, substituting LEDs for antennas.