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Old 08-02-2011, 06:09 PM
Xufyan Xufyan is offline
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Default how to learn electronic circuit design

Sometime i wonder what the hell resistor is doing in this circuit, sometimes i just confused seeing the internal circuitary of simple lamp or any other simple household items that can be build using a single switch and a battery then what the hell transistors and capacitors are doing there ?? i am just curious to learn circuit designing

is there any book that teach us how to create your own circuits or simply circuit designing ?

i am doing telecom engineering and we have so many eletronics subjects like Opamps and Osciallator, Electric Circuits, Electronic devices etc... but our teacher says since you're going to be a telecom engineering you'll not be taught circuit design

without circuit designing these subjects are useless to learn,
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Old 08-02-2011, 06:52 PM
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ErnieM ErnieM is offline
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Consider an artist verses someone who can "paint by numbers." The latter person is just doing rote fill in work, but if they keep at it then it may click way down deep how colors interact, how the impression of shapes and shading can play together, and the "why" that cannot be taught may spring to life and they begin to paint outside the lines and create new fresh art.

Engineering can be broken down into analysis and synthesis. In analysis one learns how things work, how to calculate what a given device or circuit may do.

Synthesis is very different as it starts with a desire and a blank piece of paper. One may know of certain established building blocks to do some functions but eventually something brand new must be created. How that new thing comes about I cannot tell you, for me it comes fourth whole from some silent part of my brain, as if that muse was not part of me.

My muse does need to be fed, a constant stream of facts and details that are left to silently peculate and arise unbidden with some new design. It cannot be forced.

Analysis can be taught, and it is analysis that feeds the muse.

Synthesis cannot be taught.

Learn whatever your teacher can teach you, it is not a futile effort.

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"If a fool would but persist in his folly, he would become wise."
“Freedom is never more than one generation away from extinction. We didn’t pass it to our children in the bloodstream. It must be fought for, protected, and handed on for them to do the same, or one day we will spend our sunset years telling our children and our children’s children what it was once like in the United States where men were free.”
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Old 08-02-2011, 09:17 PM
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Bill_Marsden Bill_Marsden is offline
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Cookbooks are good ways to learn how other people solved problems, which is why I like them so much. After a while, you can use the alternate solutions in your projects.

You hear people talk about "thinking outside the box". Many times this is code that they want to do something that isn't possible, but what it should mean is looking for ways to solve a problem that is not immediately obvious.

For example, suppose you need a flasher where the battery life is a major issue. Do you really need alternate LEDs on all the time, or if they alternated and were on for a fraction of the time solve the battery life issue?
"Good enough is enemy of the best." An old engineering saying, Author unknown.

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If you have a question, please start a thread/topic. I do not provide gratis assistance via PM nor E-mail, as that would violate the intent of this Board, which is sharing knowledge ... and deprives you of other knowledgeable input. Thanks for the verbage Wookie.
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Old 08-02-2011, 10:28 PM
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Adjuster Adjuster is offline
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Simple electrical appliances like electric lamps can be made without electronic gadgetry, as they were in the past. More sophisticated devices, like a lamp that lights when you touch it, or when the room gets dark, need more complex circuits. There is a value judgement as to whether the added cost, complexity, and potential unreliability is worthwhile.

Your best course for now may be to do your best to learn the things that your teacher is willing to teach you, and think about more advanced things only once you have a better grasp of the basics.
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Old 08-02-2011, 10:50 PM
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Sparky49 Sparky49 is offline
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You might be surprised at what you can design - you just have to have a 'problem' to utilise your knowledge. Even with some basic knowledge you can do some pretty cool things. A lot can be done with some transistors, op amps and logic gates.

When designing a circuit, think about what you want it to achieve. Then how do you think the circuit will do this? Start simple. What power source will you be using? A 9V battery? Sketch it down.

Then what? A status led? Draw that down, but remember it needs a resistor to 'protect' it. Does the circuit need to count for a certain amount of time after some sort of trigger? If so, think what you can use. Perhaps a 555 timer in monostable. Draw all that out.

See how by taking little steps you can create your own circuit? It may not be a super-dooper all-singing all-dancing circuit with a hundred ICs and crystals and bluetooth and all that stuff, but it's a circuit that you have made.

I say, get a real grasp of the basic concepts, and then tweak them, join them, do whatever to create your own circuit. Good luck!
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Old 08-03-2011, 01:30 PM
Crispin Crispin is offline
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Originally Posted by Sparky49 View Post just have to have a 'problem' to utilise your knowledge. ...
Nail on the head I think.

I used to tinker, read endless books, studied electronics at school (some 20 years ago) but never really did anything great.

My current solar project is a problem that needs a solution. I am having great fun designing and building it with knowledge I knew way back when (an lots of new stuff)

Once you have a real problem / project you need a solution for, that is when you can be creative and use the seemingly disconnected ramblings your teacher is teaching you.
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Old 08-04-2011, 04:26 AM
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EclecticElectric EclecticElectric is offline
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I absolutely agree with the above posts, there is a completely different perspective when you are trying to achieve something specific. Asking yourself the question "what goes into an electric circuit" can lead to endless possibilities and make it seem overwhelming. However, if you ask yourself "what goes into the circuity of a lamp" (using the example from above), it narrows it down quite a bit.

Best of luck!
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