Circuito Integrado 555 Monostable, Astable, Timer 555 y Aplicaciones
TLC551 IC Timer - CMOS 555 with 1V to 15V power, up to 1.8MHz [TLC551CP] : ID 5222 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits
IC 555 Timer Calculator with Formulas and Equations
555 Timer IC - Features, Pinout, Working, Circuit, Operating Modes