3 MB, Unknown (.pdf) Updated by Abraham Guillén 2015-11-02 Abraham Guillén 2015-09-27 y was interested in these circuit alone time ago, but i never tried using him, it really works? lulhu 2015-09-27 2015-09-27 I’ll try soon :) Somebody said that there is a app for smartphone that do de same. I don’t have a smartphone. But, anyway, it may be fun to build the thing. Abraham Guillén 2015-11-02 okey let me now when you buid the machine