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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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 Posted: Tue Nov 08, 2011 7:00 pm |
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| Quote: | edit : I think resistor in image "3k3" should be 33k
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If you had a question about that style of notation, this thread discusses it,
and especially the last post explains why it is done:
http://forum.allaboutcircuits.com/showthread.php?t=973
(Yes, I already knew this, but I like to do links rather than type). |
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RAzorex
Joined: 07 Nov 2011
Posts: 13
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| Posted: Wed Nov 09, 2011 3:37 am |
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| oh.. I never saw a notation like this. It good to learn that. Thanks |
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RF_Developer
Joined: 07 Feb 2011
Posts: 839
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| Posted: Wed Nov 09, 2011 3:51 am |
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It's been around for what, 20, 30 years? It gets rid of decimal points, which can get lost on printouts and copies, and copies of copies of dodgy printouts.... R is used for Ohms and M for meg Ohms. So 1R8 is 1.8 Ohms, 10M is 10 meg Ohms and 0R015 is... quite small... errr.... 15milliOhms. And yes, we do use resistors that small: for current sensing purposes.
RF Developer |
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RAzorex
Joined: 07 Nov 2011
Posts: 13
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| Posted: Wed Nov 09, 2011 4:40 am |
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| I am studying physics so I know way around basic electronics, in my defense I never saw one in any example ciruit we've been shown I didn't know so I learned whats the big deal? Don't get me wrong. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19596
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| Posted: Wed Nov 09, 2011 5:24 am |
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Not a 'big deal', except for the original misunderstanding. However it suggests the 'basic electronics' you are being shown/using, is perhaps not following normal practice.
I think it has been around even longer than RF_Developer says, in perhaps narrower fields. I was first introduced to this style over forty years ago, by an ex military electronics designer, and he had circuits using this style, which had been laid out in WWII (and, yes he had kept some of them...).
Best Wishes |
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RAzorex
Joined: 07 Nov 2011
Posts: 13
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| Posted: Wed Nov 09, 2011 5:49 am |
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Most of the time we were too busy with calculations though maybe we did see those notations and I forgot it. It wouldn't be the first time  . Originally this project I'm working on include 3 people. Now I'm left alone with all the work. So I'm a little overwhelmed. I've been trying to get this one for weeks now and absence of an oscilloscope is not helping:). So
I really appreciate all the help I can get.
Thanks |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19596
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| Posted: Wed Nov 09, 2011 7:01 am |
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Seriously, an oscilloscope, for electronics, is like the lathe for engineering. Basically essential...
Can you borrow one?.
Old models are so cheap second hand now, and some basic ones are nearly as cheap new, that you have probably cost yourself more by not having one, that it'd cost. Ebay?.
Most basic scopes are not sold, but end up being given away!...
Seed studios, were doing a little kit one for $50, but I think that has gone up a bit.
In the UK, the little Velleman HPS140, is under £80, and quite useful even when you have something better.
Best Wishes |
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RAzorex
Joined: 07 Nov 2011
Posts: 13
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| Posted: Wed Nov 09, 2011 7:08 am |
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I am counting on the one at school and got permission to use it, hopefully I will have some time before the exams 2 weeks later. Btw is it possible that breadboard is not suitable for these kinda circuit? I'm getting weird readings sometimes.
thanks |
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Gabriel
Joined: 03 Aug 2009
Posts: 1067
Location: Panama
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| Posted: Fri Nov 11, 2011 12:31 pm |
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.... have you heard of maxbotics?
http://www.maxbotix.com/products.htm
they sell them at sparkfun.com
really cheap... really simple... multiple output formats in one package..
save yourself the hassle.... focus on the robot...
G
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CCS PCM 5.078 & CCS PCH 5.093 |
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