Pulse Amplifier utilizes the ADC (analogue to digital converter) of a conventional PS2 controller to convert voltage signals generated by external sensors. It sends MIDI information that I can then use in Max/MSP.

It actually uses an LDR to measure the amount of light travelling through your earlobe from an LED. This changes slightly every time a pulse of blood flows through it, and provides a tiny analogue signal that can be amplified. The PS2 ADC unit converts this to a useful digital signal that can be sent to any kind of software.

I designed and made the prototype circuit into a printed circuit board that can now easily be reproduced.