Wednesday, March 25, 2016
Changing naming conventions. The light source will be known as BitBeacon and
the photodiode circuit will be the BitReceptor.

Added a non-inverting amplifier to BitBeacon to get a higher peak-to-peak emission from ~5V-4.2V to 1.3V-0.96V for about 3V-3.5V peak-to-peak. Now using 3 IR LEDs (SFH 4545) and a 6.8 kOhm base resistor. But also swap between 5.6 kOhm to 8.2 kOhm. Average current through each LED is on the order of 33 mA.

Moved C3 on BitBeacon (light source) from ground to 5V. It appears to make the sine wave generator much more stable.