Applied Science

Piezoelectric Braille system with PC parallel port control and HV transistors (2011x8)

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Here's a project that makes use of these electronic Braille characters: http://www.metec-ag.de/braille%20cell%20p16.html I built a bunch of transistor amplifiers and use two 74hc373 chips driven by the parallel port to control the state of both Braille characters. Excellent resource for PC parallel port control: http://www.beyondlogic.org/spp/parallel.htm