Electronics > Beginners

Beginner Components?

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WattsUp:

--- Quote from: JacobEdward on February 22, 2015, 10:56:55 pm ---Something I'm not too clear on that hopefully you could explain is why voltage regulators are preferable to voltage dividers in conjunction with capacitors...  what is a voltage regulator made of or is it just an IC of more basic components?  I get the idea of using a voltage regulator in AC to DC conversions, but is there another necessary use case?

--- End quote ---
I'm not quite sure what you are asking, but a voltage divider should NOT be used to create a power supply rail. They are intended for very low signal currents. A voltage regulator is basically just a zener reference diode, with an emitter follower and some overheat protection (You can make your own). For AC to DC conversion, you will need a transformer to lower the voltage, and a bridge rectifier and some big ass capacitors to smooth out the supply under load. Capacitors are used with voltage regulators in a similar way, to prevent voltage peaks and dips by storing and releasing energy when it is needed. Hopefully that answered your query.
Ben

Simon:
The problem seems to be that our OP has no concept of current (AMPS !!!!) until he gets this he will be trying to run loads off signal pins.

Zero999:

--- Quote from: JacobEdward on February 22, 2015, 10:49:05 pm ---
--- Quote from: Simon on February 22, 2015, 10:10:48 pm ---JavaScript does not exactly sound like a microcontroller language.

--- End quote ---

Javascript is a turing complete language, what that means is there is nothing that any other language can do that Javascript cannot do (it just so happens that Javascript is directly built into the major browsers, can script a server, create offline apps, mobile apps, microcontrollers, etc.)
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Javascript is also an interpreted language which makes it very slow compared to a compiled language such as C so itsn't suitable for most MCUs.

It's possible to run Javascript on an MCU but it's not cheap or efficient.
https://tessel.io/

iamdarkyoshi:
If you want a good play with inductors, build a joule thief and then try to modify it yourself to operate a flourescent tube instead of an LED. it can be done, but tounge angle is important  :-/O

iamdarkyoshi:

--- Quote from: JacobEdward on February 22, 2015, 11:07:45 pm ---
--- Quote from: Hero999 on February 22, 2015, 11:01:20 pm ---A variable speed motor drive does a lot. It converts the mains voltage to a stabilised DC bus, provides isolation between the AC side and control and has power factor correction. It will have many other components as well as the MCU: MOSFETs/IGBTs, opt-isolators, op-amps, huge electrolytic capacitors, inductors, radio interference filtering. A good variable frequency drive will also have to meet various standards for everything from electrical safety to efficiency.

--- End quote ---

I would like to build my own variable frequency drive (it seems like a good device to learn fundamental electronics with), do you know any really good tutorials out there with an explicit BOM I can use?

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This was made by me completely out of bordem in my digital electronics class, and could potentially drive a HDD motor. Good ol' 555 timer (of course) and a couple 74ls74's made this and could potentially be cascaded for 4 or more outputs.

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