For the DP Badge project we used some tiny TSSOP logic ICs, including the ULN2003 (pictured above) , 74HC595, 74HC4017, and the 555 timer. Previews from our Eagle part library are blow the fold.
Alvaro built a Capacitance meter out of logic chips for the Open 7400 Logic Competition. His project measures capacitance of a capacitor and displays it on a 7-segment display. It works by using the said capacitor in a RC oscillator, which changes its output frequency proportionally to the capacitance in it’s RC circuit. The frequency […]