Integrated Circuits

Posted on Feb 5, 2014

An Intergrated ircuit is just that. an intergrated circuit. These small packages combine many individual components to perform a specific function. They vary in shape and size depending on their complexity. They are categorised into functions like Audio, Digital, Timers and many special functions. The limit is almost endless. The 555 ICis a univer

Integrated Circuits
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sal timer used for many purposes and in the case above to flash LEDs on and off. With the help of a few external components, the 555 can precisely calculate time. How this is done is usually of no concern to electronics enthusiasts - as long as it works! However a basic overview may be interesting: The figure below shows a functional block diagram of the 555. The dotted line is the chip with leg numbers shown. External components around the chip give flexability to the timer - a 5 minute timer would have different external components to a 30 minute timer. Leg numbers follow a convention. The top of the chip is indicated by a circle or notch at the top. With the chip in this orientation, the top left pin in pin 1 - counting down to the bottom left pin then up the right side. Searching the manufacturers website will yeild data sheets for IC`s you are using. These data sheets have all the information needed to use the chips - a sample data sheet : LM 555 Data Sheet

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