[QUOTE=Rad McCool;34161043]IE = IC right?[/QUOTE]
Yes and no, IE is technically IB + IC but often IB is so low it can be ignored.
In this circuit IE is set by the DC base bias.
VE = VB - 0.7V~
So for example if VB was 2V then VE will be around 1.3V
So then IE = VE / RE.
The AC signal adjust the emitter current in turn changing the collector voltage since VC = IE * RE, assuming there is no AC bypass.
Since there is AC bypass the becomes VC = IE * Re + RE || XC
RE being the emitter resistor for the DC bias, and Re being the intrinsic emitter resistance (which may be ignored), RE the DC feedback resistor and Xc being the reactance of the capacitor which should be very low for your desired signal.
DC gain = RC / RE
AC gain = RC / Re + RE || XC
[b]Also Sparkfun free day now on ![/b]
I appreciate the effort, but it's not working out. Look, I just need to know the equations for Vout.
[u]I know:[/u]
All R values (including signal)
In-resistance
Out-resistance
Vg
VCEQ
VBE
IBE
ICEQ
Av
β
gm
I know I'm slow, and normally I wouldn't hassle you, but I need to know this :(
[QUOTE=Rad McCool;34161340]I appreciate the effort, but it's not working out. Look, I just need to know the equations for Vout.
[u]I know:[/u]
All R values (including signal)
In-resistance
Out-resistance
Vg
VCEQ
VBE
IBE
ICEQ
Av
β
gm
I know I'm slow, and normally I wouldn't hassle you, but I need to know this :([/QUOTE]
I'm not sure what Vg is, do you mean Vb ?
or VCEQ
or IBE (you don't measure current over something, do you mean IB or IE)
or ICEQ
As I said before the DC collector output voltage is IE * RE
Which is only true as long a RL is infinite, if you have a value for RL then it becomes:
VC * (RL) / (RC + RL)
If you're learning this from school or something then I'd give your teacher a good poke with a sharp stick since he / she has clearly not explained some things.
Vg - the voltage from the generator.
VCEQ - quotient voltage, collector-emitter
ICEQ - quotient current, collector-emitter (=IC)
I calculate the quotient values to get rπ and ro => which give me Av, Rin, and Rout.
[QUOTE=Rad McCool;34161741]Vg - the voltage from the generator.
VCEQ - quotient voltage, collector-emitter
ICEQ - quotient current, collector-emitter (=IC)
I calculate the quotient values to get rπ and ro => which give me Av, Rin, and Rout.[/QUOTE]
Do you mean the quiescent voltage and current ?
I'm also not sure what rn and ro is, do you mean RC and RE ?
Also the Sparkfun giveaway is really shit, type in captcha until you randomly win, and apparently you have to pay shipping so it's not a giveaway.
Quiscent, yes of course :)
rπ and ro are the internal in- and out-resistances of the transistor.
But we can leave this for now.. I will try to hunt down my teacher tomorrow.
[img]http://i52.tinypic.com/e9x0jl.png[/img]
hmmm... still got 20 dollars left
[QUOTE=DrLuke;34174992][img]http://i52.tinypic.com/e9x0jl.png[/img]
hmmm... still got 20 dollars left[/QUOTE]
Buy me an Arduino Uno.
I have no idea how to code and suddenly I find myself with an Arduino.
halp
[img_thumb]http://i.imgur.com/5EXhe.jpg[/img_thumb]
[img_thumb]http://i.imgur.com/SsTse.jpg[/img_thumb]
EDIT:
[img_thumb]http://i.imgur.com/vOjnt.jpg[/img_thumb]
Flybacks are fun, now my room smells like ozone.
Nice and I just blew up another FET :-C
RIP 2N65
[QUOTE=Chryseus;34180934]Nice and I just blew up another FET :-C
RIP 2N65[/QUOTE]
[media]http://www.youtube.com/watch?v=Wn_iz8z2AGw[/media]
[QUOTE=ddrl46;34180758][img_thumb]http://i.imgur.com/5EXhe.jpg[/img_thumb]
PEEKCHUZ
Flybacks are fun, now my room smells like ozone.[/QUOTE]
Ozone isn't too healthy at increased doses, and the increased doses count from when you can actually smell the ozone.
[QUOTE=alexaz;34181329]Ozone isn't too healthy at increased doses, and the increased doses count from when you can actually smell the ozone.[/QUOTE]
Don't worry, I opened a window and only smelled it for a short time.
I'd be much more concerned about nitrogen dioxide than ozone
Ozone is known to react with mucous membranes in your body, as it's very unstable. Basically you start to oxidize from the inside (you rust).
That's why some people get breathing problems when the ozone-content in the air is too high.
But it shouldn't be a problem if exposure only lasts a few minutes.
[QUOTE=DrLuke;34174992][img]http://i52.tinypic.com/e9x0jl.png[/img]
hmmm... still got 20 dollars left[/QUOTE]
I was quite disappointed that they did it on a week day - Meant I couldn't enter. :(
Anyway, I got one of these last year and they are pretty cool:
[url]http://www.sparkfun.com/products/9147[/url]
[QUOTE=yngndrw;34183242]I was quite disappointed that they did it on a week day - Meant I couldn't enter. :(
Anyway, I got one of these last year and they are pretty cool:
[url]http://www.sparkfun.com/products/9147[/url][/QUOTE]
Yes, they look pretty awesome, but to be honest I don't want to waste 10$ for a small piece of pcb with a mcu on it. There's better stuff to get for that amount.
[QUOTE=DrLuke;34182383]Ozone is known to react with mucous membranes in your body, as it's very unstable. Basically you start to oxidize from the inside [B](you rust).[/B]
That's why some people get breathing problems when the ozone-content in the air is too high.
But it shouldn't be a problem if exposure only lasts a few minutes.[/QUOTE]
oh man.
what I envisioned there was both terrifying and hilarious.
[img]http://img717.imageshack.us/img717/5730/20120113035447.jpg[/img]
Yessir, reckon it don't get much simpler than that. (not my soldering job BTW)
[QUOTE=Zero-Point;34190782][img]http://img717.imageshack.us/img717/5730/20120113035447.jpg[/img]
Yessir, reckon it don't get much simpler than that. (not my soldering job BTW)[/QUOTE]
Well, I guess using an AVR with USB-capability would be way cooler for those tiny sticks. If you then use the TQFP package and maybe even add an SD-card slot you can do cool things like your own card reader.
[QUOTE=DrLuke;34193638]Well, I guess using an AVR with USB-capability would be way cooler for those tiny sticks. If you then use the TQFP package and maybe even add an SD-card slot you can do cool things like your own card reader.[/QUOTE]
See I have no idea what you just said, why do I even have this? :saddowns:
But apparantley it's still pin-for-pin compatible with Arduino so I'm gonna see if I can't use it for a project I've had lined up for too damn long, which involves budget computer parts, a 10-gallon aquarium, 7-ish gallons of mineral oil, and a R-410a refrigeration compressor.
[QUOTE=Zero-Point;34198957]which involves budget computer parts, a 10-gallon aquarium, 7-ish gallons of mineral oil, and a R-410a refrigeration compressor.[/QUOTE]
I predict flames.
[QUOTE=Chryseus;34200974]I predict flames.[/QUOTE]
Mineral oil doesn't conduct electricity, thus you can use submerge electric components (that includes a whole PC, I saw a case like that on an expo) in it.
I'm thinking of getting [url=http://www.saleae.com/Logic]a logic analyzer[/url] with the help of my freeday cash, it'll be nice to have around, and more tools is always a good thing. Shame it's still kinda expensive after shipping and customs, even with $100 off.
[quote][url=http://dlnmh9ip6v2uc.cloudfront.net/images/products/08938-01.jpg][img]http://dlnmh9ip6v2uc.cloudfront.net/images/products/08938-01.jpg[/img][/url][/quote]
[QUOTE=Lapsus;34201228]I'm thinking of getting [url=http://www.saleae.com/Logic]a logic analyzer[/url] with the help of my freeday cash, it'll be nice to have around, and more tools is always a good thing. Shame it's still kinda expensive after shipping and customs, even with $100 off.[/QUOTE]
If you're looking for a cheaper logic analyzer you could take a look at the bus pirate. It's featured quite a bit on hackaday and you can pick up the parts for less than $50.
24MHz sampling rate is kinda low :\
Though almost every SPI/whatever peripheral is going to be operating in the 10-100s of KHz, so it should be just fine for that.
My Openbench can sample up to 200MHz, but it doesn't have a nice enclosure and the software is absolute crap. I guess you really can't have your cake and eat it too.
I'm also getting the bus-pirate. It's a cool thing, and it has a big community behind it.
I hate when this happens....
The ECU in my car is royally buttfucking my fuel economy and making the engine hard to idle when hot and left off for three or more minutes. Me and a friend went and built the following ALDL to RS-232 converter:
[img]http://www.suzuki-forums.com/attachments/suzuki-sidekick-escudo-vitara-geo-tracker/7371d1241390627-aldl-connector-aldl-jtgh1.jpg[/img]
The only part we deviated on was the MAX232 which instead is a MAX232CPE and we powered it off the +12v available from the ALDL interface (it has three pins for power, ground, and data).
We then connected it and powered on the ECU and then tried to read it through the freeware RhinoView Engine manager.
[img]http://www.rhinopower.org/Rhinoview/images/rhinoview.jpg[/img]
Unfortunately the Bad Data Count counter kept going up and the program itself didn't actually display anything.
There is a quick test you can do for the adapter we made to see if it's at least working and tht is to open Hyper Terminal and open a console session with flow control turned off. If you get a character echo the MAX232 is working and it did exactly that.
Time to now go over the perfboard and see if we screwed anything up.
[QUOTE=Chryseus;34200974]I predict flames.[/QUOTE]
The mineral-oil PC already works, I'd just like it to be a little bit... [I]cooler[/I].
And I'm not using 410a as the refrigerant, hellz no. I'm using R-134a as it's more suitable for this application, is easier for me to obtain, is a tad cheaper, and doesn't involve the fuck-huge pressures that 410a does. Also, it uses the same oil, which is a huge plus 'cause I haven't the clue on how you'd change the oil in a sealed hermetic compressor. :v:
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