Of course, if the IR emitter in the proximity sensor were running ... very high gain, the circuit becomes prone to oscillating due to the inherent capacitance of the photodiode, so there’s ...

It uses a very small photodiode ... The circuit only draws about 1mA, but [Alan] says he can probably get that down to a few micoAmps. A perfect radiation sensor for lightweight and low power ...

Photodiodes ... Sensor materials need to be CMOS-compatible, meaning they don’t negatively affect semiconductor performance and can be easily integrated into the existing circuit manufacturing ...