Activity for TonyStewart
| Type | On... | Excerpt | Status | Date |
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| Edit | Post #286862 |
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| Edit | Post #286862 |
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| Comment | Post #286862 |
Thanks Olin, I added details to explain for others to understand why it is 180 + 180, with the assumption he knows there exists a frequency point at which -180 deg occurs from 3rd order (x90deg) phase shift) from 2L's and 1 C in a Pi filter. This is a slight change, from the Hartley. (more) |
— | over 1 year ago |
| Edit | Post #286862 |
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| Edit | Post #286862 |
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| Edit | Post #286862 |
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| Edit | Post #286862 |
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| Edit | Post #286862 | Initial revision | — | over 1 year ago |
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A: Results of analysis of Hartley oscillator dont make sense This LC circuit depends on several criteria for stable linear oscillation; - 180 deg phase shift ( with 3rd order LC network) plus 180 degree inversion to achieve the oscillation criteria of 0 or 360 deg at gain >=1 Thus each reactance affects fo. - adequate bias current and impedance ratios with... (more) |
— | over 1 year ago |
| Comment | Post #286859 |
Not precisely, but you can filter the harmonic content of a broadband pulse to pass a narrow BW filter. Or you can phase modulate a square wave and filter any harmonic or fundamental.
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— | over 1 year ago |
| Edit | Post #286215 | Initial revision | — | about 2 years ago |
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A: What reactance actually is? Reactance is the lossless part of impedance that stores and releases energy E=1/2 LI^2 or 1/2CV^2 . Much like a spring stores energy when compressed or expanded. L is a conductor that stores current with charges flowing. Q=LI. C is an insulator with some dielectric constant , Dk, relative to a... (more) |
— | about 2 years ago |
| Edit | Post #286211 |
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— | about 2 years ago |
| Edit | Post #286211 | Initial revision | — | about 2 years ago |
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A: When do I need to put anti-aliasing filter in front of SAR ADC? Anti-Aliasing filter depends on the following parameters; 1. Signal BW 2. Sampling Rate 3. Sampling duration and thus BW of sample 4. LPF attenuation of alias spectrum above 1. From your SNR spec or dynamic range desired for resolution When sampling rates of 64x are used, ofte... (more) |
— | about 2 years ago |
| Comment | Post #286209 |
Level shifting can be accomodated with >10k resistors to limit ESD diode current rating specified.
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— | about 2 years ago |
| Comment | Post #286209 |
IF you want to detect tri-states, you need to specify the condition for the high-Zstate such as back driving with a 10k resistor 1/0 and detect that. (more) |
— | about 2 years ago |
| Edit | Post #282054 |
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— | almost 3 years ago |
| Edit | Post #282054 | Initial revision | — | almost 3 years ago |
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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 3 years ago |
| Edit | Post #282053 | Initial revision | — | almost 3 years ago |
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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 3 years ago |
| Edit | Post #281598 |
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— | almost 3 years ago |
| Edit | Post #281598 |
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| Edit | Post #281598 | Initial revision | — | almost 3 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 3 years ago |
| Edit | Post #279302 |
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— | almost 3 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 3 years ago |
| Edit | Post #281597 |
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— | almost 3 years ago |
| Edit | Post #281597 |
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— | almost 3 years ago |
| Edit | Post #281597 | Initial revision | — | almost 3 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 3 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 3 years ago |
| Comment | Post #279493 |
Can you give an example where Baud Rate is higher than Bit Rate? (more) |
— | over 3 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 3 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 3 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 3 years ago |
| Edit | Post #279442 |
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| Edit | Post #279442 |
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| Edit | Post #279442 |
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| Edit | Post #279442 |
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| Edit | Post #279442 |
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| Edit | Post #279442 |
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| Edit | Post #279442 |
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| Edit | Post #279442 | Initial revision | — | over 3 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 3 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 3 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 3 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 3 years ago |
| Edit | Post #279413 |
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— | over 3 years ago |