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March 3, 2012
Completely addicted to physical computing. SparkFun is becoming more and more like my drug dealer than just a parts/kit company, LOL!
News - According to Pete: Curren… |
about 2 months ago
This bit got me a little confused. If you have a current mirror setup to supply some known current, for a string of LED’s say, and you aren’t certain of the number of LED’s, how does that effect the overall voltage drop across the transistor MOSFET? Do you more or less pick a supply Voltage that can accommodate the Max number of LED’s the circuit should allow? If the number of LED’s is less than that Max, is it reasonable to assume that voltage across the transistor (say it’s a BJT) will be Vs - (n*VLed)?
I’m gunna have to wire one up to find out for myself, but just thought I’d ask.
Usefulness of Current Mirrors:
1. For me at least, it’s another example of how transistors behave. I’m trying to understand them better, so practical application isn’t necessarily top o'my list.
2. It seemed to me that might be the current mirror is useful if you were wanting to measure a current without necessarily changing it. Don’t know, it was just one thought that came to mind.
I tend to see electronic circuits a bit like tinker toys or leggo’s. The more you are aware of and can use to some extent, the easier it is to do things (though maybe not always in the “best” way).
K, I don’t wanna sound like a Pete group-ee, but IMHO your missing the value of Pete’s byte sized tutorial/lecture/educational mmm video thing-ee’s. Happily, your also validating one of their key values.
As a total noob/non-degree’d I just wanna learn kind of guy Pete’s short segments on the core basics of various types of electronics that include just enough math to get into trouble with (or in some cases more than enough for the job) are just a start, I think. A very basic primer that might (and for me at least, does) give a person a bit of really useful, often practical information about designing and using transistors.
I took a look at the site you mentioned: I’d never seen it before and might never have encountered it, unless you’d commented on Pete’s excellent video. I’ll definitely be chewing my way through the content there and the Labs(They looked like awesome learning opportunities).
Point being, for nitwits like me, content like Pete’s video’s are a god send, as are the many helpful comments that get posted by folks. I don’t ever hear Pete claiming to be the final authority on anything, but I think he provides excellent insights into some rather difficult subjects that have, in my case at least, been a huge help in refining my understanding of electronics.
News - Christmas Candy Giveaway … |
about 3 months ago
December is like the month o'SparkFun for me this year. Gunna put one of those fly Cam’s in one of my home made rocket’s and get some cool footage from a rocket’s point of view:) Thanks for the treat!
Product DEV-11018 |
about 3 months ago
Would this Shield work to Send commands to an RF Link receiver enabled Uno (http://www.sparkfun.com/products/10532)? I’m assuming the RF22 wouldn’t work for that purpose.
News - Does It Matter Which Brow… |
about 3 months ago
I’m a FireFox fan and have been for years. I see Chrome is popular I haven’t seen anything in using it that would compel me to change my preferred browser. Internet Explorer strikes me as a poor joke and having had a bit to do with it’s development after IE6 just reenforces that opinion :(
News - Cyber Monday Is Upon Us! |
about 3 months ago
Just wanted to say thanks for a great Cyber Monday sale! I ordered a bunch of goodies for fun over the rest of the winter:)
News - According to Pete: Transi… |
about 4 months ago
1. I so way value the approach you’ve taken so far, it’s what I end up needing to do on the fly on my bench quite often.
2. ICircuit (http://icircuitapp.com/) which I use on my Surface, but can run on iPads, droid devices, etc is a nice and simple simulator that helps a bit in initially sketching out these types of circuits, seeing if my math is on track, thinking isn’t wrong, etc.
That said, I like the small byte sized According to Pete segments and one or two on how to use LTSpice would be great :)
SparkFun sells a couple of the Forrest Mimms books which I rather like and Electrical Engineering 101 which is another one that’s a good read as well. Also, the Encyclopedia of Electronic components Volume 1 is pretty good as it’ll help you with coming up with common circuits used for various components,etc.
I’m also fond of The Art of Electronics (and especially the student manual) and Practical Electronics for Inventors.
I’m sure Pete and most the other folks that actually know what they are doing have even better references, but these are the ones I’m forever reaching for.
Is it useful, is it interesting? Oh Pete! Or better yet, for Pete’s sakes! It’s awesome!
Honestly, I struggle with this stuff on my hobby time alot. What am I getting out your mini-vid lesson on these simple transistor circuits? How to do a bit of transistor design and analysis. Yeah, your showing common base and common collector, but both are how to work with these really cool and for me at least incredibly slippery little devils that as you rightly pointed out can do all kinds of cool things.
I’m sitting here just dying to get home to dig in and power up a simple circuit and see ifn' I can duplicate what you described.
Please, o pretty please, don’t stop there! Common emitter is cool and the more examples I chew through and bread board up and play with teh better I get at showin them electronics who’s boss:)
No public wish lists :(