Activity for Olin Lathrop
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Edit | Post #288161 | Initial revision | — | 11 months ago |
| Answer | — |
A: How is it possible to perform a open circuit test on a induction motor? Your basic problem is that the motor needs some applied power to generate any EMF, but if you apply that power then its not an open circuit test. For a true induction motor you're probably stuck. You'll have to measure various parameters separately while the motor is being driven. By measuring t... (more) |
— | 11 months ago |
| Comment | Post #288153 |
He probably used the same naming convention in his slides as in whatever book was assigned for the class. There are probably similar diagrams in the book, which should include better explanations for what the variables and axes mean.
I can't tell whether these are supposed to be diagrams in a sin... (more) |
— | 12 months ago |
| Comment | Post #288153 |
Where did you find these diagrams? There is probably some explanatory text around them. (more) |
— | 12 months ago |
| Edit | Post #288135 | Initial revision | — | 12 months ago |
| Answer | — |
A: Over-voltage protection for device with photovoltaic cell source If you don't care about efficiency of the overall system, then a zener to limit the voltage will work. You are right in that a series resistor is not needed since the source is power-limited. One problem with a zener is finding one guaranteed to limit the voltage to the 5.5 V maximum while not ge... (more) |
— | 12 months ago |
| Comment | Post #288130 |
Hi, Jason. It would be nice to get more of the EE.SE core contributors to do what I did, but it's difficult to convince people, let alone reach out to them. It would be unethical to leave messages on EE.SE asking people to come here. You can say what you want on your personal profile, but that onl... (more) |
— | 12 months ago |
| Edit | Post #288117 |
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— | 12 months ago |
| Edit | Post #288117 |
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— | 12 months ago |
| Edit | Post #288117 |
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— | 12 months ago |
| Edit | Post #288117 |
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— | 12 months ago |
| Edit | Post #288117 | Initial revision | — | 12 months ago |
| Answer | — |
A: Calculate values of externally excited DC generator/motor Your generator constant is 2 V per Webber-Hz, or 2 V/(Wb Hz) = 2 (V s)/Wb. You somehow got a value of 5. The rest of your calculations are probably off due to that. Added I didn't have much time when I wrote the above, but can delve into this more now. From your first measurement, we can s... (more) |
— | 12 months ago |
| Edit | Post #288108 | Initial revision | — | 12 months ago |
| Answer | — |
A: Role of C2 (bypass capacitor) To properly answer this question, you need to show us a real circuit with a capacitor across the supply. There are various reasons a capacitor across a power supply might make sense. Protecting the supply from thermal noise created by a resistive load is way way down the list of likely explanatio... (more) |
— | 12 months ago |
| Edit | Post #288094 | Initial revision | — | about 1 year ago |
| Answer | — |
A: DC offset correction loop (DC servo loop). What's its advantage, compared to a high-pass RC filter? In addition to what Andy said, the DC servo method doesn't add impedance to the signal. Note that in your bottom circuit, the signal with the DC offset removed has an impedance of 1 MΩ at DC. In your case it doesn't matter since the signal is only going into an opamp input. In other cases ... (more) |
— | about 1 year ago |
| Edit | Post #288031 | Initial revision | — | about 1 year ago |
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A: How can I fix this 4-20 mA current loop to source current that matches current sink on its input? You are making this way too complicated. Go back to the basic problem definition, which is you want to get a digital reading of the current sunk by a current sink, with the valid range being 4-20 mA. It seems you chose the A/D you did because it is advertised to be able to directly read 4-20 mA c... (more) |
— | about 1 year ago |
| Comment | Post #288030 |
More popups when clicking on the links. No thanks. I probably don't need the datasheet if you just said what these parts are. Are they opamps, A/Ds, D/As, etc?
Also, how does your circuit fit into the larger block diagram? What exactly is driving PREG_N? Is that one of the current sinks you ar... (more) |
— | about 1 year ago |
| Comment | Post #288027 |
I really don't want to follow links in the first place. Any information pertinent to the question must be directly in the question. Posting a link to a datasheet is valid, but then it must go *directly to the datasheet*. There is no excuse.
No, I'm not gonna even read what a popup says. And, I... (more) |
— | about 1 year ago |
| Edit | Post #288029 | Initial revision | — | about 1 year ago |
| Answer | — |
A: Is a current-dependent current source and a current mirror the same thing? It's not clear that the problem is. It seems you want to interface to this "digital air pressure regulator" via two 4-20 mA current loops. For reading the output, it should be as simple as a 24 V power supply with a resistor in series. A 250 Ω resistor, for example, will give you a 5 V sig... (more) |
— | about 1 year ago |
| Comment | Post #288027 |
It's a bit unclear which blocks are sending and receiving and how they are connected. I tried to follow the link to your chip, but got a page with popups instead of the datasheet. (more) |
— | about 1 year ago |
| Edit | Post #288011 |
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— | about 1 year ago |
| Edit | Post #288011 | Initial revision | — | about 1 year ago |
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A: What is a good PCB-layout? I have also designed and ordered a PCB It seems rather pointless to ask after you've already ordered the board. only uses THT-components That's just plain silly. This is the kind of thing that you might see from a clueless hobbyist, but is totally unacceptable from an electrical engineering... (more) |
— | about 1 year ago |
| Edit | Post #288006 | Initial revision | — | about 1 year ago |
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A: What is the role of master clock speed on DAC In protocol I2S we have 4 signal: 1.data 2.lrck/fck (frame synchronizer) 3.bck (bit clock) 4.mck/sck (master clock) Not really. IIS really only has 3 signals: bit data, bit clock, and left/right indication. Take a look at the actual IIS protocol from NXP. Some implementations do use a "master... (more) |
— | about 1 year ago |
| Edit | Post #287957 |
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— | about 1 year ago |
| Edit | Post #287957 | Initial revision | — | about 1 year ago |
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A: What does it mean for a signal to have impedance? Impedance Yes, impedance is "extended" resistance. Impedance is really a complex value, with resistance it's real part. The imaginary part represents pure inductance or capacitance (with opposite sign). Sometimes we say "impedance" when really only the resistance is relevant. That's OK since r... (more) |
— | about 1 year ago |
| Comment | Post #287952 |
@#54288 Is the issue that you don't understand what it means for signals to have impedance in general? That's a valid question, but not something that should be buried in comments in a totally unrelated question. Ask about signal impedances in a separate question. (more) |
— | about 1 year ago |
| Edit | Post #287950 | Initial revision | — | about 1 year ago |
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A: Testing instrumentation amplifier with differential signal I think the biggest reason is that it may be difficult to control your function generator with an output of only 5 mV. Some function generators have different output ranges that are switched, then a volume knob that lets you select from 0 to the maximum for the current range. Even if it has a 100 m... (more) |
— | about 1 year ago |
| Edit | Post #287944 | Initial revision | — | about 1 year ago |
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A: Using arc trace routing instead of 45 degree trace routing The best route is a straight connection between the two points being connected. Of course that's not always possible due to other objects being in the way, or to be able to route other connections. I think most auto-routing software uses 45° bends because that's a reasonable tradeoff between ... (more) |
— | about 1 year ago |
| Comment | Post #287801 |
The speed Elsewhere has to do with how many people are watching and when the moderators are active. They have more people and more active moderators than here, more spread across time zones. You were originally offered to be a moderator, but you declined. I'd support you being a moderator if you'v... (more) |
— | over 1 year ago |
| Edit | Post #287801 | Initial revision | — | over 1 year ago |
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A: Should a fake user's posts be deleted if the fake user has subsequently been deleted by the site It's a balance. On one had, we want to be a store of knowledge. It doesn't matter what prompted a particular piece of information to be posted if it serves the long term purpose. We also don't want volunteers that wrote answers in good faith feel like they wasted their time because the original ... (more) |
— | over 1 year ago |
| Comment | Post #287773 |
@Lundin You are right, those resistors don't make sense. At total of 37.5 kΩ wouldn't let the relay turn on with 12 V as shown. I suspect something wasn't copied correctly. Maybe the C109 and 12 V are supposed to be on the left side of the resistors with high voltage on the right. Even then there... (more) |
— | over 1 year ago |
| Edit | Post #287773 | Initial revision | — | over 1 year ago |
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A: How Relay inrush current limiter works? It's a current limiter, not eliminator. The current is always supposed to flow, but be limited at startup to avoid high inrush current. All the relay does is short out R103 when activated. The relay starts out off, so R103 is in series with the input power when the device is first plugged in or ... (more) |
— | over 1 year ago |
| Edit | Post #287751 |
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— | over 1 year ago |
| Comment | Post #287746 |
Argh! Does that mean "microwave <i>oven</i> transformer"? If so, I just wasted time writing a lengthy answer that would have been rather different with this information. First, only use absolutely universal abbreviations in your question. Second, put the information directly in the question. Don... (more) |
— | over 1 year ago |
| Edit | Post #287751 | Initial revision | — | over 1 year ago |
| Answer | — |
A: how to figure out the max power of a transformer? If there isn't a VA rating on the label or published in a reliable source, then you have to guess. There are several clues that can be used: Look at the size of the primary wires. That gives you an upper bound on the primary current. You know this is meant for 220-240 V systems, so between thes... (more) |
— | over 1 year ago |
| Comment | Post #287746 |
What's a "MOT"? (more) |
— | over 1 year ago |
| Comment | Post #287728 |
You think you found what this circuit is called, but a "negative impedance converter" isn't a standard name I'm aware of. It's also the third circuit you posted in the same question, and quite different from the first that you initially asked about.
It's much more important to *understand* how a ... (more) |
— | over 1 year ago |
| Edit | Post #287729 |
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— | over 1 year ago |