Presentation on theme: "1 Electronics and Control Technology. 2 Electronics and Control The 555 timer is an 8-Pin D.I.L. Integrated Circuit or ‘chip’ What it looks like Notch."— Presentation transcript:
2 Electronics and Control The 555 timer is an 8-Pin D.I.L. Integrated Circuit or ‘chip’ What it looks like Notch Pin 1
3 Electronics and Control Operation: Contains 25 transistors, 2 diodes and 16 resistors Maximum operating voltage 16V Maximum output current 200mA If you input certain signals they will be processed / controlled in a certain manner and will produce a known output. INPUT PROCESS OUTPUT Best treated as a single component with required input and output
4 Electronics and Control What the 555 timer is used for: To switch on or off an output after a certain time delay i.e. Games timer, Porch light, Childs mobile, Exercise timer. To continually switch on and off an output i.e. Hazard warning lights, Soft toy, Bicycle indicators. As a pulse generator i.e. To provide a series of clock pulses for a counter.
5 Electronics and Control Digital Terminology: To use the 555 timer correctly you have to be aware of the correct terminology: Monostable Time Astable Time
6 Electronics and Control MONOSTABLE: This is a system which has only one stable state. It can be made to change but it will always return to its original stable state. A spring operated push button switch is an example of this. Monostable circuits are used as timers and as a single pulse generator.
9 Electronics and Control ASTABLE: This is a system which has no stable state. It changes from one state to the other all the time. A pendulum swings from one side to the other continuously. Astable circuits are used to flash lights or sound a loudspeaker. It can act as a square wave oscillator