What is it?
“A highly stable controller capable of producing accurate time delays, or oscillation.”
-Philips Components and Semiconductors
The 555 is a 8-pin intergrated circuit with 2 modes of opperation. The time delay (stable) mode is controlled by one capacitor and one resistor. The oscillation (astable) mode is controlled by a capacitor and two resistors. There is also a third mode Bistable mode or Schmitt trigger : the 555 can operate as a flip-flop, if the DIS pin is not connected and no capacitor is used. This post will focus on some of the basics of 555 ic.
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