Activity for TonyStewart
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Edit | Post #282054 |
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— | almost 4 years ago |
| Edit | Post #282054 | Initial revision | — | almost 4 years ago |
| Answer | — |
A: Capacitor ESR vs. Impedance Capacitors are lossless with 0 ESR and rise in temperature and become less reliable by 50% for every 10’C rise due to I^2ESR=Pd losses. However the current spectrum must be known with the ESR frequency graph in order to estimate losses. The ultimate goal is to attenuate ripple voltage by the imp... (more) |
— | almost 4 years ago |
| Edit | Post #282053 | Initial revision | — | almost 4 years ago |
| Answer | — |
A: Is there a way to reliably measure antenna return loss outside a lab? The RSSI detector in the receiver is the best field tool. In Windows I had a tool (Wifi Radar?) that read the Broadcom IC RSSI and displayed a time plot of the results as I changed laptop orientation a couple of degrees and the results might change from -74 to -84 dBm and result in occasional errors ... (more) |
— | almost 4 years ago |
| Edit | Post #281598 |
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— | almost 4 years ago |
| Edit | Post #281598 |
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— | almost 4 years ago |
| Edit | Post #281598 | Initial revision | — | almost 4 years ago |
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A: Why are antenna PCB traces square instead of rounded? Corners and chambers that are a small fraction of a wavelength are not significant in the <4Ghz band. More significant is the tolerance and loss tangent on the substrate. They would hardly be measureable even with a 2 ps TDR. Emissions are not significantly different. WHAT COUNTS is the RL and lo... (more) |
— | almost 4 years ago |
| Edit | Post #279302 |
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— | almost 4 years ago |
| Comment | Post #281444 |
But we only wore tinfoil hats when I bought a Lingren EMI proof chamber. In the 90’s. (more) |
— | almost 4 years ago |
| Edit | Post #281597 |
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— | almost 4 years ago |
| Edit | Post #281597 |
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— | almost 4 years ago |
| Edit | Post #281597 | Initial revision | — | almost 4 years ago |
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A: Estimating the input capacitance of an BLDC motor controller To answer some of your questions: Cable inductance: - - approx 1uH/m +/-50% depends slightly on l/d ratio , while cable impedance from sqrt(L/C) depends on twists/ft 50pF/m while coax is 100pF/m Bulk storage Cap - - C value should store Energy Ec for load power x sag time between puls... (more) |
— | almost 4 years ago |
| Comment | Post #279493 |
I remember when Qmodem would compute the bit rate differently, and shown higher than output expected. On dialup using 56k modems in high speed mode with a faster serial port, they would count the start and stop bits in the transfer rate, which then of course got translated into , I forget 64 levels ... (more) |
— | almost 4 years ago |
| Comment | Post #279493 |
Can you give an example where Baud Rate is higher than Bit Rate? (more) |
— | over 4 years ago |
| Comment | Post #279493 |
... So don't byte me for saying your Byte rate example is not related to bit rate vs baud rate or symbol rate. but does affect character rate. characters are not symbols in this sense yet are symbols in language. (more) |
— | over 4 years ago |
| Comment | Post #279493 |
There are many types of Baud Symbols that compress bits in time, frequency, phase or time in many combinations by sending many per unit of a bit. such as 9600 modems using 1200+2400 Hz tones with multiple levels to get 8 bits per Baud symbol in a 2400~3000 Hz bandwidth. ( I think, I forget)
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— | over 4 years ago |
| Comment | Post #279493 |
Dear Olin, I think you are using bit rate efficiency with overhead to define effective data rate, both which have nothing to do with the bit/s baud compression technology
Symbols can stuff more bits per symbol such as the Baud symbol in a modem after Émile Baudot who invented the Baudot code (Bodo... (more) |
— | over 4 years ago |
| Edit | Post #279442 |
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— | over 4 years ago |
| Edit | Post #279442 |
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— | over 4 years ago |
| Edit | Post #279442 |
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— | over 4 years ago |
| Edit | Post #279442 |
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— | over 4 years ago |
| Edit | Post #279442 |
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— | over 4 years ago |
| Edit | Post #279442 |
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— | over 4 years ago |
| Edit | Post #279442 |
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— | over 4 years ago |
| Edit | Post #279442 | Initial revision | — | over 4 years ago |
| Answer | — |
A: How to estimate time of completion while developing an electronic product? In my 15 yrs of intense deadline R&D for new state-of-the-art design in my 45yrs experience, estimation of time is inversely proportional to the number of mini failures from bad assumptions from which you learn to expand your understanding of everything. You don’t have to be brilliant, that helps imm... (more) |
— | over 4 years ago |
| Comment | Post #279010 |
The cap must be low ESR type as there is also an R ratio from arc negative resistance to cap ESR voltage divider. The. Common mode series R and TVS diodes provide secondary clamping with current limiting R chosen for 1kV to TVS Rs. The arc -ve Rs was proven by Faraday to be inverse to current densi... (more) |
— | over 4 years ago |
| Comment | Post #279010 |
Erhm When the resistor arcs it will become a capacitance transformer, 200pF/100nF = 0.2% of 15kV
so move the caps to the shunt R and make the current loop small and close to the injection PT. The cap must be low ESR type as there is also an R ratio from arc negative resistance to cap ESR voltage di... (more) |
— | over 4 years ago |
| Comment | Post #279010 |
With 0 tolerance parts this amplifier acts with open loop gain as the feedbacks are equal and cancel. Olin is correct, and the tolerance stack up would make this an unpredictable outcome. This design fails because of unstated assumptions for designs specs, yet intuition and experience tells it won’t ... (more) |
— | over 4 years ago |
| Edit | Post #279413 |
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— | over 4 years ago |
| Edit | Post #279413 | Initial revision | — | over 4 years ago |
| Answer | — |
A: How to plot the I-V curve of a tunnel diode? How to test a Tunnel diode in 25 words or less. - With DC bias = 490mV with fine tuning and a small signal swing of 60mV you can generate a IV negative slope of -16 Ohms. (more) |
— | over 4 years ago |
| Comment | Post #279280 |
Don’t take down vote personally, it means some jerk thinks you made a bad assumption or statement. If they give no feedback or value added comment , ignore those trolls who have communication issues. You seem competent enough to make intelligent questions, but watch out for unstated assumptions. (more) |
— | over 4 years ago |
| Edit | Post #279388 |
Post edited: |
— | over 4 years ago |
| Edit | Post #279388 | Initial revision | — | over 4 years ago |
| Answer | — |
A: Using FET based followers and design rules Allow me to address the MOSFET only as a source follower. - this has very unpredictable linear use without voltage = current feedback as the RdsOn at threshold has a wide tolerance.(>20%) (Many wider than the next example). However it is extremely popular in dual N ch. designs for a Half Bridge ... (more) |
— | over 4 years ago |
| Comment | Post #279228 |
That’s the spec on the tightening of the connectors to achieve desired low loss without removal of excessive gold plating. (more) |
— | over 4 years ago |
| Comment | Post #279302 |
@Lundin. Low value added readers who fail to communicate and downvote are called Trolls (more) |
— | over 4 years ago |
| Comment | Post #279016 |
have fun learning.. maybe I'll make a Youtube or Zoom or any forum to train a group if there is interest. But I need motivation to do this. (more) |
— | over 4 years ago |
| Comment | Post #279016 |
This article has value to share your method that works for you. I learned 45 yrs ago when we had no tools except paper and pencil and experiments. So it worked for me too. But now I can do so much more using Falstad's simulators, that its amazing as long as you know to make ideal parts real C+ESR,... (more) |
— | over 4 years ago |
| Edit | Post #279302 |
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— | over 4 years ago |
| Comment | Post #278856 |
@Olin's assertion to resonant frequency is totally bogus. Water has absorptive properties over many decades of f without this resonance. http://www1.lsbu.ac.uk/water/microwave_water.html#loss This is a good reference but fails to discuss the ionic behaviors of contaminants.
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— | over 4 years ago |
| Comment | Post #279302 |
IF you are an experienced EE and down vote this without comments you are in contempt of your own ego issue and have no business here. (more) |
— | over 4 years ago |
| Comment | Post #278856 |
false assumption on resonant frequency of water. -1 (more) |
— | over 4 years ago |
| Edit | Post #279302 |
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— | over 4 years ago |
| Edit | Post #279302 |
Post edited: |
— | over 4 years ago |
| Edit | Post #279302 | Initial revision | — | over 4 years ago |