Activity for Olin Lathrop
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Edit | Post #286707 |
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— | almost 2 years ago |
| Edit | Post #286707 | Initial revision | — | almost 2 years ago |
| Answer | — |
A: Finding voltage gain of Hartley oscillator I'm not going to get into rigorous analysis. My perception is that you're getting hung up on details and forgetting to think what the overall circuit is doing and how it works. I'll therefore stick to providing some intuition. An oscillator is what an AC amplifier becomes whenever there is posit... (more) |
— | almost 2 years ago |
| Edit | Post #286700 |
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— | almost 2 years ago |
| Comment | Post #286700 |
@a concerned citizen: You should make this an answer. It shouldn't be buried down here in comments. When you do, I'll delete this comment chain. (more) |
— | almost 2 years ago |
| Comment | Post #286700 |
OK, "any" was too broad. "Any real-world" function would be better, since those can be decomposed to a set of sines. Since the system is linear, each sine component of the input can be treated independently. (more) |
— | almost 2 years ago |
| Edit | Post #286700 | Initial revision | — | almost 2 years ago |
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A: Complex frequency of a pole Your question doesn't make a lot of sense. for a sinusoidal input signal s = jω the pole exists at the resonant frequency ωr. Actually the pole exists regardless of what the input signal is. The transfer function is a description of what happens with any input signal. However if... (more) |
— | almost 2 years ago |
| Edit | Post #286689 |
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— | almost 2 years ago |
| Edit | Post #286689 | Initial revision | — | almost 2 years ago |
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A: Effect of adding stages to a filter There are a number of misconceptions here. bode plot db/Hz First, it's "dB", not "db". Second that's not a Bode plot. Those are dB/Log(Hz). In other words, a certain frequency ratio results in a fixed gain ratio as the slope approaches the asymptote. You were told in your previous questio... (more) |
— | almost 2 years ago |
| Comment | Post #286681 |
But your question starts out with <i>"I have to design a low-pass filter"</i>. Don't lie to us and jerk around the volunteers here like that. Two people have now wasted time trying to help you with this filter, only to find out the very unusual and difficult requirements were totally arbitrary. (more) |
— | almost 2 years ago |
| Edit | Post #286680 | Question reopened | — | almost 2 years ago |
| Comment | Post #286681 |
Then explain how you ended up with these specific requirements and what overall problem you are trying to solve. The question currently reads like a contrived problem, just like homework. (more) |
— | almost 2 years ago |
| Edit | Post #286680 | Question closed | — | almost 2 years ago |
| Edit | Post #286681 | Initial revision | — | almost 2 years ago |
| Answer | — |
A: How to design a low-pass filter when certain conditions must be met Simple filters don't cause a fixed ratio change in amplitude (dB) for a fixed change in linear frequency (Hz). Making the amplitude change by -0.1 dB/Hz would be very difficult. This could be done with a very carefully designed digital filter. However, there is a loophole. Since only the averag... (more) |
— | almost 2 years ago |
| Edit | Post #286673 | Initial revision | — | almost 2 years ago |
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A: Siglent1104 oscilloscope channels lagging If all four channels are really connected to the same signal in the pictures you show, then there is indeed some skew between pairs of channels. Try swapping probes to see if the lag goes with the probe or the channel. Also try on the 1x setting. That should have less parasitic low pass filter... (more) |
— | almost 2 years ago |
| Edit | Post #286661 | Initial revision | — | almost 2 years ago |
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A: Limiting current to DC brushed motor I don't think there is a simple way to inherently limit the current to 10 A. The best approach seems to me to add a low side current sensor between the bottom of the H bridge and ground. The main tradeoff is getting enough current resolution without excessive voltage drop or power dissipation. ... (more) |
— | almost 2 years ago |
| Edit | Post #286657 |
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— | almost 2 years ago |
| Edit | Post #286657 | Initial revision | — | almost 2 years ago |
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A: H-Bridge components and calculations Firstly, is this calculation for power dissipation correct? P = (I2 R) + (I V (ton+toff)/2 f) = 0.517 W Not completely. There are two separate parts that need to be considered. I2RDSON is the power dissipated by the FET when on. However, you can't use the average current. You have to av... (more) |
— | almost 2 years ago |
| Edit | Post #286614 |
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— | almost 2 years ago |
| Edit | Post #286614 |
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— | almost 2 years ago |
| Edit | Post #286614 |
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— | almost 2 years ago |
| Edit | Post #286614 | Initial revision | — | almost 2 years ago |
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A: Mysterious little cases hanging on street wirings in India This is not a direct answer, but a few observations that might be clues. The additional pictures help, but you still haven't answered where this is. The purpose of the question was to get some idea of how formally things are done in your area. This pictures show a mess, hinting at this being s... (more) |
— | almost 2 years ago |
| Edit | Post #286595 |
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— | almost 2 years ago |
| Edit | Post #286595 | Initial revision | — | almost 2 years ago |
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A: What effect will extreme temperatures have on characteristic impedance of a wire? The expansion of the conductors is the least of your problems. The real issue is the effect of excessive temperature on the insulators. The plastic in the cable has three electrical functions: To insulate the two separate conductors. To provide a specific constant dielectric between the con... (more) |
— | almost 2 years ago |
| Comment | Post #286589 |
Content is not easily noticed in comments, and can get deleted altogether. (more) |
— | almost 2 years ago |
| Comment | Post #286589 |
This is an interesting discussion, but not suited for comments. (more) |
— | almost 2 years ago |
| Comment | Post #286589 |
The underlying physics is more complicated than strictly voltage-controlled or current-controlled. However, a reasonable physics model is that trying to draw electrons out of the base (NPN example) is a lossy process, since most of the electrons that leave the emitter get swept away to the collector... (more) |
— | almost 2 years ago |
| Comment | Post #286537 |
Your new picture shows the basic configuration, but not the specs of what you want the circuit to achieve. Is it amplifying a digital signal? Analog? What impedance? Voltage/current range? The picture is also obnoxiously large. Being rude to the volunteers you seek a favor from is not a good wa... (more) |
— | almost 2 years ago |
| Edit | Post #286538 |
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— | almost 2 years ago |
| Edit | Post #286536 |
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— | almost 2 years ago |
| Comment | Post #286537 |
Show the circuit. The operating point depends on other circuit elements around the transistor. (more) |
— | almost 2 years ago |
| Edit | Post #286538 | Initial revision | — | almost 2 years ago |
| Answer | — |
A: Unexpected impedance spike when paralleling capacitors Unfortunately the frequency legend on your graphs are too small to see, so we don't know how the left and right graphs relate to each other. However, what is certainly going on in the left graph is a LC resonance. Again, it would be useful to know where that peak is in relation to the right graph... (more) |
— | almost 2 years ago |
| Edit | Post #286536 | Initial revision | — | almost 2 years ago |
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A: Re model of transistor is the same in 2 different configuration I'm not sure what you mean by the "Re" model, but ultimately the transistor does a certain thing regardless of what label we put on the circuit it is in. For a NPN like you're modeling, you will have base current going into the base and coming out the emitter, and collector current going into the ... (more) |
— | almost 2 years ago |
| Edit | Post #286494 |
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— | almost 2 years ago |
| Edit | Post #286494 | Initial revision | — | almost 2 years ago |
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A: Thévenins Theorem for Transistor Circuit It seems like you did the reduction to a Thevenin source mostly right, although the final value is a bit off. The original circuit we want to reduce to a Thevenin source is: First we reduce V1, R1, and R2 to a Thevenin source. The resistance is R1//R2, and the voltage is the V1 voltage app... (more) |
— | almost 2 years ago |
| Edit | Post #286477 | Initial revision | — | almost 2 years ago |
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A: Wish to have comment votes I see that Monica answered your question directly. However, there is another point to keep in mind. Comments are not for content. That was supposedly the case at SE too, but was poorly enforced. We are more strict about that here. Comments therefore shouldn't be important enough to vote on. ... (more) |
— | almost 2 years ago |
| Edit | Post #286104 |
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— | about 2 years ago |
| Edit | Post #286314 |
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— | about 2 years ago |