Hello everyone !
Even though I follow the EEVblog in Youtube for a while, I only registered in the forum today.
And to start, would like to post 2 questions at once if I may:
1st. : I Just finished my first semester in Electronics Engineering. But I'm not feeling very confident about what I've learned. So I decided to search for more exercises around the web. But, because of me or because of her (web
![Cheesy :D](https://www.eevblog.com/forum/Smileys/default/xcheesy.gif.pagespeed.ic.KPzuH4J-TG.png)
), I can't find any.
I'm looking for the kind of challenging exercise, but something with a solution to finally see if I did it well.
Something along the lines of: "Design a circuit that makes this..."
Or something into Circuit Analysis.
(Note: I have a book which name is: "Introduction to Electric Circuits" written by Richard C. Dorf and James A. Svoboda.
But I've done most of the exercises there and I'm kind of tired of doing exercises only from it).
My current knowledge in electronics is fairly limited in terms of analysis (and understanding), I can only analyse:
-Resistors
-Capacitors
-Coils
-OpAmps
- vDC / iDC sources
- VAC / IAC sources
- current controlled DC voltage sources
- voltage controlled DC voltage sources
- current controlled DC current sources
- voltage controlled DC current sources
(So this is where I can go right now to solve exercises)
If any one knows where I can see some nice exercises, please let me know! I still believe around somewhere in the net there is a site with some
![Cheesy :D](https://www.eevblog.com/forum/Smileys/default/xcheesy.gif.pagespeed.ic.KPzuH4J-TG.png)
.
The second question is:
Because in practice I "know" a bit more than in theory, I tend to do experiences with components I don't really know much about in terms of calculations.
So the day I was playing around with an AC to DC adaptor, I was looking at the circuit seeing how it was done and saw some diodes in a "diode bridge" configuration, which "I know" cuts the AC wave into a "DC" wave (not a pure DC but at least is always positive or zero xD). Decided to hack it so I could get the 50 Hz wave in AC out of it. Was successful. So I know from AC to "DC" I "just" need a diode bridge and it's done. My problem is:
What if I have only a DC source available??
How will I get an oscillating wave if I need one?
Already tried to figure it out but can't. I can do an oscillation with a capacitor, a resistor and a coil, but it will fade with time if I don't "charge" the coil with DC again.
So with these components, is it possible in any way I'm not seeing, to make an oscillator for example to create the 50 Hz wave again?
(Note: I saw this article
http://en.wikipedia.org/wiki/Wien_bridge_oscillator but didn't quite understand it, which is making me a bit nervous xD ).
Well, let me finish this,sorry for the long post and thank you in advance for the space to place the newbie questions!
krd777