In order to further characterise and test the EOGee prototypes, it is important to be able to inject known signals and measure the output. This is not trivial, as the devices are configured to measure micro-volts of signal and a normal signal generator cannot synthesising a signal of such small magnitude. Secondly, the device takes a differential measurement, and so a differential signal is required rather than a single-ended one, as most signal generators produce.
To fix this issue I designed FakeEyes, a PCB to take a 3.3V peak single ended signal and convert it into a 1700uV peak differential signal.
Continue reading “Project: EOGee – Injecting Fake Signals with FakeEyes for Frequency Analysis”