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| When to buy an oscilloscope ? |
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| rstofer:
Very nice! Just what I was thinking about when I brought it up. Somehow Vc=Vin(1-e-t/RC) and Vc = Vin(e-t/RC) just don't do as much for me. |
| tggzzz:
--- Quote from: rstofer on January 17, 2019, 09:43:33 pm ---Very nice! Just what I was thinking about when I brought it up. Somehow Vc=Vin(1-e-t/RC) and Vc = Vin(e-t/RC) just don't do as much for me. --- End quote --- It is fun to see a practical manifestation of theory. But without the theory is is just another pretty picture. So much of modern electronics requires maths that not understanding the theoretical maths is career limiting. |
| rstofer:
--- Quote from: tggzzz on January 17, 2019, 10:24:53 pm --- --- Quote from: rstofer on January 17, 2019, 09:43:33 pm ---Very nice! Just what I was thinking about when I brought it up. Somehow Vc=Vin(1-e-t/RC) and Vc = Vin(e-t/RC) just don't do as much for me. --- End quote --- It is fun to see a practical manifestation of theory. But without the theory is is just another pretty picture. So much of modern electronics requires maths that not understanding the theoretical maths is career limiting. --- End quote --- True enough! Without the math there is no career. No degree either, for that matter. Engineering is nothing more than applied math. Lots and lots of math. But that's not the case for the casual hobbyist. They can get along fine with the fundamentals like Thevenin and Kirchhoff (both KVL and KCL). If they find themselves without a particular tool, there's a lot of information on the Internet. |
| vk6zgo:
--- Quote from: rstofer on January 17, 2019, 09:43:33 pm ---Very nice! Just what I was thinking about when I brought it up. Somehow Vc=Vin(1-e-t/RC) and Vc = Vin(e-t/RC) just don't do as much for me. --- End quote --- Graph paper, pencil, & a reasonably active imagination, & you've got it! |
| rstofer:
--- Quote from: vk6zgo on January 18, 2019, 02:44:50 am --- --- Quote from: rstofer on January 17, 2019, 09:43:33 pm ---Very nice! Just what I was thinking about when I brought it up. Somehow Vc=Vin(1-e-t/RC) and Vc = Vin(e-t/RC) just don't do as much for me. --- End quote --- Graph paper, pencil, & a reasonably active imagination, & you've got it! --- End quote --- Yup! Make the Y axis of the graph 10 units and scale that as 100%. The X axis should go from 0 to 6 Tau where Tau is the time constant which is R in Ohms times C in Farads. Then all you need are 7 pairs of numbers: The time constant and the percent of full voltage: --- Code: ---Tau % charge Plot 0 0 (0, 0.0) 1 63 (1, 6.3) 2 86 (2, 8.6) 3 95 (3, 9.5) 4 98 (4, 9.8) 5 99 (5, 9.9) 6 100 (6,10.0) --- End code --- Connect the dots. Most people will only go to about 3 Tau and then just handwave the rest. The important part is that the capacitor is 63% charged in one time constant and fully charged in six. Or close enough... |
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