Activity for Andy aka
| Type | On... | Excerpt | Status | Date |
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| Answer | — |
A: Capacitor ESR vs. Impedance > Which graph on the picture above better represents real-world use-case? They both represent real-world use cases. The impedance graph informs you how much ESL (effective series inductance) the capacitor has and, at the series resonance point you can evaluate the ESL value with a simple formul... (more) |
— | over 3 years ago |
| Comment | Post #281165 |
Yeah I think the 10 nH is a tad high compared to the real true value needed (8.7 nH) (more) |
— | over 3 years ago |
| Comment | Post #281165 |
You didn't say what calculator you used or what values it came up with. (more) |
— | over 3 years ago |
| Comment | Post #281226 |
Good result Leroy (more) |
— | over 3 years ago |
| Edit | Post #281165 |
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— | over 3 years ago |
| Comment | Post #281165 |
Regards LoRa, I can't answer that so maybe address it to the OP. (more) |
— | over 3 years ago |
| Comment | Post #281165 |
@Lundin trying to target a specific frequency with a notch filter is haphazard and relies on low drift components. Having said that, you can add a capacitor across the inductor in the PI filter and get an elliptic (Cauer) filter that does do that (but at the expense of not being great if the bandwidt... (more) |
— | over 3 years ago |
| Comment | Post #281165 |
@Lundin a PI filter is the archetypal impedance matching network to turn to. The fact that it can have seriously good attenuation characteristics outside the pass band is a major bonus. Usage of PI filters in reduction of EMC isn't really using them as a proper (intended) circuit but just as a bidire... (more) |
— | over 3 years ago |
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— | over 3 years ago |
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— | over 3 years ago |
| Comment | Post #281165 |
... If you look at the link to the calculator in my answer and scroll down I've made a [5 stage](http://www.stades.co.uk/Impedance%20TX/Simulations/PI%20cascaded.png) filter and that has a monstrous and slope [here](http://www.stades.co.uk/Impedance%20TX/Simulations/PI%20cascaded%20simulation.png). ... (more) |
— | over 3 years ago |
| Comment | Post #281165 |
@Lundin if the simpler pi filter provides enough attenuation then no need to go to a more sophisticated filter. However, you can absolutely stack end-to-end pi filters to get both impedance matching and steeper roll-off..... (more) |
— | over 3 years ago |
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— | over 3 years ago |
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— | over 3 years ago |
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— | over 3 years ago |
| Edit | Post #281165 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Filter RF Harmonics With Additional PI Network > Since we are trying to keep the impedance matched to 50 ohms, what is the best strategy to approach this circuit? A low pass \$\pi\$ network seems a good route to go. Basically your \$\pi\$ network is designed to do two important things: - - Impedance match a 50 Ω source to a 50 Ω... (more) |
— | over 3 years ago |
| Edit | Post #281141 |
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— | over 3 years ago |
| Edit | Post #281141 | Initial revision | — | over 3 years ago |
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A: Why is it is always power consumption or power delivered more in usage? > In circuit analysis why always the power has upper hand over energy? One obvious reason: - If we calculate how much power a resistor dissipates we can calculate how hot it will get (knowing it's thermal resistance and ambient temperature and some other factors). We need to know how hot stu... (more) |
— | over 3 years ago |
| Comment | Post #281064 |
What are you trying to achieve with your modulated signal? OOK? Non-suppressed carrier? Suppressed carrier? You need to be clear about your goals. 555 timers are normally suited for anything but basic modulation schemes. (more) |
— | over 3 years ago |
| Comment | Post #281059 |
Have you tried looking for wide bandwidth unity gain stable op-amps? (more) |
— | over 3 years ago |
| Comment | Post #281021 |
*Can there be a global EMP disaster* - I'm sure there could be one day (more) |
— | over 3 years ago |
| Comment | Post #280791 |
24 volts is probably used more often than 28 volts and quite possibly 72 volts is more common than 60 volts. 15 volts is also commonly used. (more) |
— | almost 4 years ago |
| Edit | Post #280733 | Initial revision | — | almost 4 years ago |
| Answer | — |
A: Is it always necessary to use the ground terminal of the oscilloscope probe? To add to Olin's excellent answer, if you were probing on a digital IO line in order to view a fast changing signal, without the local ground clip (or spring) grounded close to where you make the measurement, you would, in effect, be adding an antenna to that IO line and causing interference to other... (more) |
— | almost 4 years ago |
| Comment | Post #280600 |
Use a simulator. Really, use a simulator. If you are not able to use a simulator let me give you some very, very good and strong advice: Get a simulator and learn how to use it. (more) |
— | almost 4 years ago |
| Comment | Post #280450 |
**Are there any considerations from electrical perspective, such as safety regulations** - I don't think safety is a consideration if the object of the exercise is to shuffle off someone's mortal coil. (more) |
— | almost 4 years ago |
| Comment | Post #280394 |
If you want me to comment on your proposal, a schematic will be needed @Lundin. (more) |
— | almost 4 years ago |
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— | almost 4 years ago |
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— | almost 4 years ago |
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— | almost 4 years ago |
| Edit | Post #280394 | Initial revision | — | almost 4 years ago |
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A: What should be considered when picking a flyback diode? > a coil with plain on/off functionality, for example a 24VDC relay coil with 700mW max coil power. That means a coil current of 0.7 watts / 24 volts = 30 mA. A relay might have a coil inductance of anything from 1 henry upwards but this can be estimated by the relay activation time in the... (more) |
— | almost 4 years ago |
| Comment | Post #280327 |
Don't forget to wear your mask. (more) |
— | almost 4 years ago |
| Comment | Post #280327 |
Just a guess but in your lower picture (ignoring the detail immediately at the support pole and looking a little to the right), it looks like the lower cable might physically swap places with the upper cable in order to get the same induction from the power cables and thus cancel out differential ind... (more) |
— | almost 4 years ago |
| Comment | Post #280040 |
@Joel - thanks for the info. (more) |
— | almost 4 years ago |
| Edit | Post #280040 | Initial revision | — | almost 4 years ago |
| Question | — |
User's reputation score not displaying on top ribbon It appears that a user's reputation score has disappeared from the top ribbon at the side of the user's login avatar/picture. Is this an intentional thing? (more) |
— | almost 4 years ago |
| Comment | Post #279987 |
@Lundin - is it 7 that is the maximum? Was my memory finally letting me down !! (more) |
— | almost 4 years ago |
| Edit | Post #279987 |
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— | almost 4 years ago |
| Edit | Post #279987 | Initial revision | — | almost 4 years ago |
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A: CAN Bus - Internal Oscillator CAN is asynchronous and, if you receive a string of consecutive zeros, the UART mechanism that turns raw CAN data into "a byte" might have to wait a great deal longer than 1 bit of data before it can re-sync. If data is coming 101010101010 then that's great but, if data is 010000000010 then you ha... (more) |
— | almost 4 years ago |
| Comment | Post #279961 |
@2kind - if that is all you have on your secondary then the 700 mA applies when charging the capacitor. But, bear in mind that I don't want you responding with another variant of what load might be connected for me to have to make another comment because where would this process stop? (more) |
— | almost 4 years ago |
| Comment | Post #279962 |
@z3333 it all depends on the actual ADC device - I'm just throwing into the ring an easy option that works for most ADCs. (more) |
— | almost 4 years ago |
| Comment | Post #279961 |
@2kind - What capacitor? What pulse? I know nothing about your target circuit and, to answer your question, I didn't need that information. (more) |
— | almost 4 years ago |
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— | almost 4 years ago |
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— | almost 4 years ago |
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— | almost 4 years ago |
| Edit | Post #279962 | Initial revision | — | almost 4 years ago |