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Hello and welcome to a new instructables series called "Know Your Integrated Circuit"
Know Your IC seeks to demystify common Integrated Circuits and allows people to understand them to a point where they can use them in their own projects.
The first circuit in this series is the widely used 555 timer.
If you have suggestions for future chips we should cover, please shoot me an email!
UPDATE:
I decided to make the layout pictures easier to read, i know it was confusing some people. I hope this helps!
Know Your IC seeks to demystify common Integrated Circuits and allows people to understand them to a point where they can use them in their own projects.
The first circuit in this series is the widely used 555 timer.
If you have suggestions for future chips we should cover, please shoot me an email!
UPDATE:
I decided to make the layout pictures easier to read, i know it was confusing some people. I hope this helps!
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Signing UpStep 1History Of The Chip
The 555 timer was created by Hans Camenzind (b. 1934) in 1970 while he was working for Signetics. The design process took about a year. Designing the chip was all done by hand, using rubylith which made the process take much longer than by today's standards.
The 555 timer replaced 23 transistors, 15 resistors and 2 diodes and allowed manufacturers to use this problem solving method much easier.
Today with billions of the chips in exsistence, it is one of the most widely used chips. Most people who do electronics hear of the 555 timer first. It is the gateway drug to the world of integrated circuits.
References
http://www.semiconductormuseum.com/Transistors/LectureHall/Camenzind/
The 555 timer replaced 23 transistors, 15 resistors and 2 diodes and allowed manufacturers to use this problem solving method much easier.
Today with billions of the chips in exsistence, it is one of the most widely used chips. Most people who do electronics hear of the 555 timer first. It is the gateway drug to the world of integrated circuits.
References
http://www.semiconductormuseum.com/Transistors/LectureHall/Camenzind/
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Have a great day! :)
Similarly, Capacitors aren't really measured in volts, if that's what you're asking. Capacitors are measured in Farads. One would apply a current of some voltage to a capacitor to charge it, and expect it to produce a current as it discharges. Both are exponential functions of time, if you were wondering.
The author said that you'll need a 220 Ohm resistor, and a 100 Ohm resistor.
As far as capacitors, you'll want a 4.7 uF (that's micro Farads the 'u' should be a 'mue' character from Greek.).
It sounds like you sort of figured circuit analysis is just a matter of adding up a few numbers (once in a while it is), but usually its a bit more complicated than that.
I suggest reading about basic circuits. if you're still in school, take a physics class in electricity and magnetism. You'll be glad you did. You should be able to find some good tutorials floating around otherwise.
Similarly, capacitors also have a voltage rating on them to indicate what the maximum voltage that the capacitor could hold a charge for. There are millions of different voltage values on capacitors, each made for a specific use. It is a good Idea to double the maximum voltage that you will be using in the circuit to get the proper voltage rating on your capacitors.
thks
I build my first light effect with the same circuit as the author used.
This could be the start of a very interesting development but answers should be forthcoming.
heeeeeeeeeeeeeeeeeelp
I updated the layout picture so it's easier to read, and i tested it out and it works. Post some good pictures of your layout and i can try to help you!
It's a great idea to have a 'series...' and I look forward to more.
I used to use the 555 and 556 way back in the early 80s and this 'ible has got me going to revisit those days with a few 555 projects.
I wouldn't mind reading a quality audio amp project with minimal components.
Also the choice of the 100k resistor at pin 7 means the Off time will be about 10 times the On-time. Perhaps a bit more about calculating exact component values to get precise frequencies will be helpful!