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for a circuit not exactly as the one shown below,
I have L293 gone to be overheating
the motors I used is shown in the link.
I used PWM of frequency=4KHZ.
VS of L293 is connected to the battery acros 3.5 Ohm/1w resistor.
Note: there is a mistake in the schematic, the connections of 1Y, 2Y, 3A, 4A. fixed
Quote from: Abdulla M.A. on October 30, 2010, 06:02:45 AMthe motors I used is shown in the link.Sure, a picture tells a thousand words, but I'd settle for engineering specs like voltage range, peak efficiency current and locked rotor current.However, SparkFun writes that it works with the L293D, which is weaker than the L293.If you use the L293 (the one without a "D"-postfix), did you remember adding protection diodes?
@SoerenHere in Baghdad we have a wise said "Deal with people in your ethics, not in their ethics"your are really strange person!!!!!
BTW, in the university you just deal with theortical problems, and this is known in all the world universities, so you need alot of time to get practical experiance,
I think you are older than me in at least 10 years, that's mean you took more time in electronics, so when I will became in your age, I will be better than you
Now, I will answer your questions:1- No Comments (search for answer above).2- Very hot, sorry but I do not have thermometer( ) to measure the Temp!!! I did not make PCB, it cost alot, about 40$ single layer, it's too much if we compare it with USA where it cost 9$
3-I used L293D, L293D do not need FWD
anyway, I solved the problem.
4-The resistor to step down the voltage because Pulse voltage must be less than 6v, so what is the problem!!! do you have any suggestions??
You are not allowed to tinker in your spare time during Uni?Well, extracting info from a datasheet does belong in the theoretical phase where you calculate what's possible in a given circuit.
An interesting thought... At least the one I had about, how you got from the thesis to the conclusion in that single sentence.Well, anything is (theoretically, at least) possible, but you need to speed up (and perhaps reverse time) then, as I was designing (working) circuits when I was much younger than you are now, before I had any formal education in electronics (among lots of other stuff, I build my own Z80 based personal computer when I was a teenager).You won't ever be as flexible as a Chinese artist either, even if you start now and work at it for the rest of your life - starting as a kid, when your body and brain has a lot of plasticity is the key to later mastery.Sure I'm older than you (Isn't that something that usually calls for respect in Baghdad? ), my sons are older than you as well, but age has nothing to do with it, it's your way of assimilating, or rather rejecting, info. I have told you at several occasions that you should provide engineering data rather than fluffy descriptions and I would think that it came naturally for one signing himself as engineer (and sometimes teacher/educator), .
Spare time!!!! really you do not know what's going on!!! you do not know the Prof. here, anyway I will give you an idea about the life and the study here:
you have to wake up at 6 am, at 8:30 am the first lecture start, if you reach at 8:35 am, you will not enter, the lectures end at 2:30 pm, you will be at home 4 pm,
[...] small rest and lunch,
[...] the O'clock become 5 pm. so you have just7 hours to study, and this is not too much to get success,
many of the students were falled, as I remember we were 138student in the first year, in the graduation, we were just 40.
yo do not know how much the difficulty of the studying, you have to learn everything by yourself.
Hmm, you built a computer!!!! let me see it, if what you said is correct!!! I do not think it's possible to build a personal computer by yourself specially you do not have that enough info. about computer architectures, memories, .... in thatage!! be more logical please.
I changed L293D with L298.
is that your solution!!!
do you think, I did not think in that!!!!
the motors take to much currentat stand still (2100 mA), 7805, LM317, not suitable in this application, right??
D.C Motor No.= FA-130, just google it.
[...] but ofcourse you probably already thought of that too...