1. The “555 Timer” A quick Intro

2. What is a Timer? a small chip which generates a constant electrical pulse. Used extensively in electronics The CPU has a timer which regulates it’s speed. Ex: 500 MHz, 2 GHz

3. The 555 Timer This is the most widely used timer chip Generates a pulse using a capacitor and some resistors The resistors and capacitors regulate it’s frequency.

4. A Capacitor? Capacitors accumulate and release electric charge Used in almost all electronic devices Units: Farad –A Farad is a very large quantity our capacitors will be measured in microfarads (  F)

5. The Timer The dot indicates pin 1

6. Your Job(s) For today: Use the wiring instructions found in the assignment to set up your timer. Create a schematic of your circuit in Tina –Include a Key! Create a chart matching the different resistor values with the output