RandomTritium PUBLIC

This is a concept for a random number generator based on an Atomic Accesories inc. TSM-91-A tritium monitor, using a single LM358 IC. This circuit takes the voltage supplied to the analog meter on the tritium monitor and outputs 2.5V when the input is steady, 3.5V when the input is increasing quickly, and 0V when the input is decreasing quickly. This output can easily be interpreted by a microcontroller with an ADC as is, or it could fed through a schmitt trigger and then into a digital input pin. Random numbers could be extracted from this signal a number of ways, e.g. timing radiation spikes or counting the number of spikes in some time period.

Project details here: http://cs.marlboro.edu/courses/spring2012/jims_tutorials/alex/CircuitsProject