I know bits and pieces of electronics from a mis-spent youth of physics, ICs, and computer science. My practical knowledge is really rusty, though, so I've started slowly re-studying again.
I found an interesting and cheap science kit on the Make Mag website, from Sparkle labs. It's beginner enough for me at the moment, but since it's aimed at kids it doesn't explain everything.
So, the first project is to light up an LED, a good variation on the old battery and light bulb. It's basically 9V battery, LED, and resistor.
What puzzles me is some of the extras. I have attached a schematic. There's a voltage regulator and two capacitors. I only dimly understand why they're there. The regulator cuts the 9V down to 5V, but why the capacitors? And why in parallel?
I thought that maybe the capacitors keep the current steady to the LED, but if so, why not have them in series past the regulator? And what the heck is inside the regulator?
Also, I assume that the resistor is there to prevent a short circuit. Is that correct.
And finally, anyone have some good drawing tools for schematics? I tried using Visio, but it's shapes are pretty weak.
I found an interesting and cheap science kit on the Make Mag website, from Sparkle labs. It's beginner enough for me at the moment, but since it's aimed at kids it doesn't explain everything.
So, the first project is to light up an LED, a good variation on the old battery and light bulb. It's basically 9V battery, LED, and resistor.
What puzzles me is some of the extras. I have attached a schematic. There's a voltage regulator and two capacitors. I only dimly understand why they're there. The regulator cuts the 9V down to 5V, but why the capacitors? And why in parallel?
I thought that maybe the capacitors keep the current steady to the LED, but if so, why not have them in series past the regulator? And what the heck is inside the regulator?
Also, I assume that the resistor is there to prevent a short circuit. Is that correct.
And finally, anyone have some good drawing tools for schematics? I tried using Visio, but it's shapes are pretty weak.
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