Activity for Olin Lathropâ€
| Type | On... | Excerpt | Status | Date |
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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 2 years ago |
| Edit | Post #287751 |
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— | over 2 years 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 2 years ago |
| Edit | Post #287751 | Initial revision | — | over 2 years ago |
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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 2 years ago |
| Comment | Post #287746 |
What's a "MOT"? (more) |
— | over 2 years 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 2 years ago |
| Edit | Post #287729 |
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| Edit | Post #287729 |
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| Edit | Post #287729 | Initial revision | — | over 2 years ago |
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A: What we call this opamp configuration? [SOLVED] What we call this opamp configuration? A mess. What's the advantage and the disadvantage of this circuit? This can't be judged without the stated objectives. It might be useful for keeping undergrads busy trying to analyze this circuit. And what's the purpose of the L2 ... (more) |
— | over 2 years ago |
| Edit | Post #287727 |
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— | over 2 years ago |
| Edit | Post #287726 |
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| Edit | Post #287727 | Initial revision | — | over 2 years ago |
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A: Audio OpAmp requirements The specs you need from an opamp in an audio circuit are somewhat dependent on the particular circuit. As you state, requirements of good audio circuits are high signal to noise ratio and low distortion, relative to many other analog circuits. The noise figure of an opamp is usually a fixed value... (more) |
— | over 2 years ago |
| Edit | Post #287726 | Initial revision | — | over 2 years ago |
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A: Why arc welding does not require high voltage to arc? It takes high voltage to start the arc. Once started, the air is ionized, and becomes fairly conductive. It then takes much less voltage to keep the current flowing to sustain the arc. This also explains why you have to touch the terminals together to start the arc. Touching shorts the output, ... (more) |
— | over 2 years ago |
| Comment | Post #285186 |
Oops, you're right. The actual schematic is correct, and the device works as expected, but I apparently didn't pay attention to the dots when drawing up this less-cluttered version. In the real schematic, the secondary is flipped. The top part is connected to ground, with the bottom end feeding th... (more) |
— | over 2 years ago |
| Comment | Post #287689 |
@Freewill Only **you** can answer that question. We don't know your application and therefore how tolerant it is to noise on the sine wave. This is one of the questions we've been asking you all along.
If you can't quantify the parameters we asked for, you can at least explain how you intend to ... (more) |
— | over 2 years ago |
| Comment | Post #287689 |
*who want an inaccurate circuit* - The point is all circuits are inaccurate. You will always get an inaccurate circuit. The important question is then **how** inaccurate is tolerable. There is a wide spectrum of tradeoff between the various performance characteristics of a sine wave generator. Di... (more) |
— | over 2 years ago |
| Comment | Post #287689 |
*I finished by giving all information necessary to get helped:* - No you didn't. That's the problem.
*frequency range* - Yes, that's useful. That was clear in the question, so I didn't ask about it further.
*amplitude, current* - Those don't matter, because that would just be an issue for an... (more) |
— | over 2 years ago |
| Comment | Post #287689 |
@Freewill: I asked you several questions, but you only answered one of them, and then with an impossible value. We tried to help, but you wouldn't cooperate and do your part. If you want to continue, carefully read the questions I posed in the comment titled "Specs?", then specifically answer each ... (more) |
— | over 2 years ago |
| Edit | Post #287689 | Initial revision | — | over 2 years ago |
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A: What Sine-Wave Oscillator can be controlled with a microcontroller? pure stable sinusoidal wave This is impossible. Forget it. Go home. No matter what you do, there will always be some noise added to the sine wave. Some random noise and some harmonic distortion are inevitable. (more) |
— | over 2 years ago |
| Comment | Post #287678 |
How accurate does this "sine wave" need to be? THD? Max error as fraction of full scale? Some other metric? How well must amplitude be controlled, like ±3dB over the full range for example? How do you set the frequency? How accurate does the result need to be to the setpoint? There are various p... (more) |
— | over 2 years ago |
| Comment | Post #287646 |
Saying to "never" use the auto-router is going too far. Auto-routers can be useful tools. But, as with any tool, you have to understand what it's good at and what not, and use it accordingly. You have to know your auto-router, what all the settings do, and make sure you set them appropriately for ... (more) |
— | over 2 years ago |
| Edit | Post #287646 | Initial revision | — | over 2 years ago |
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A: Unterminated SPI bus needs expansion board to work properly At 1 MHz it's probably not transmission line effects. It's not clear from your question whether the SPI bus works on the main board with the expansion board connected, but not when it's not connected. If so, I expect you're right about the additional capacitance. An easy way to check this is to ... (more) |
— | over 2 years ago |
| Edit | Post #287629 | Initial revision | — | over 2 years ago |
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A: How to check realistic specs of small solar panel? Your proposed circuit will work, but "before the voltage drops significantly" is rather wishy-washy. I would at least use a second meter to measure the current. What you really want to know is the power, which is the voltage times the current. With two meters you can sortof eyeball it and find a... (more) |
— | over 2 years ago |
| Comment | Post #287535 |
This is a question and answer site, not a threaded discussion forum. If you have more information about the question, add it to the question. I have deleted your "answer" because it did not answer the question. (more) |
— | over 2 years ago |
| Edit | Post #287535 |
Post edited: Removed time-wasting content-free fluff. |
— | over 2 years ago |
| Edit | Post #287536 | Initial revision | — | over 2 years ago |
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A: Possible stray current corrosion in reinforced concrete First clarify where this leakage current will be flowing. You seem to think that some parts of the solar panel will generate a small current thru the rebar into the ground, but where is the closed loop? The polarity also matters. Current flowing one direction from steel to dirty water causes cor... (more) |
— | over 2 years ago |
| Edit | Post #287533 |
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— | over 2 years ago |
| Edit | Post #287533 | Initial revision | — | over 2 years ago |
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A: How to calculate the voltage of a coil? calculate the voltage that will center the magnetic field of a coil This is not possible since the voltage has no effect on the position or shape of the magnetic field. The position and shape are fixed by the position and shape of the coil. But the higher the tension, the wider the magnetic fi... (more) |
— | over 2 years ago |
| Edit | Post #287449 | Initial revision | — | over 2 years ago |
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A: What is the difference between rise/fall time and Turn-On/off Delay Time? In general, the on/off delay is how long it takes from changing the input until the output starts to do something. The rise/fall time is how long it takes to do the something, once it starts doing it. Your first FET driver datasheet is a good example: The switching characteristics are idea... (more) |
— | over 2 years ago |
| Edit | Post #287436 |
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— | over 2 years ago |
| Edit | Post #287436 |
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| Edit | Post #287436 | Initial revision | — | over 2 years ago |
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A: Is it possible to calculate the rise/fall time of an operational amplifier ? Rise and falls times are limited by the maximum slew rate the opamp can produce. This is something you look up in the datasheet. Note that the slew rate might be dependent on supply voltage and possibly other factors. Or, the datasheet might just give a single minimum large-signal slew rate for th... (more) |
— | over 2 years ago |
| Comment | Post #287434 |
It's OK to answer Andy here, but you also need to fix the question so that everyone else can see too. Content isn't expected to be in comments. As it is, the question is inconsistent with itself. (more) |
— | over 2 years ago |
| Comment | Post #287434 |
There are several problems with this question that should be addressed:
1 - Trim your image! Those big black rectangles above and below your schematic are annoying at best. If you won't bother creating an easily readable presentation, why should we bother trying to help?
2 - Link to the datas... (more) |
— | over 2 years ago |
| Comment | Post #287400 |
*" you wish to use ..."*. I disagree this is the "normal" case. The CRT startup code shouldn't be making such assumptions. Lots of problems happen with hidden logic tries to automatically do things for you. You should get what you explicitly ask for. If you don't ask for something you need, that... (more) |
— | over 2 years ago |
| Comment | Post #287400 |
Nice writeup (+1), but I can't let this go: *"some dysfunctionally written CRTs do not set-up fundamental things like watchdog and clock settings"*. There are reasons you don't want to use a watchdog timer, or need more control over the clock settings than can be explained to the CRT. Good CRT star... (more) |
— | over 2 years ago |
| Comment | Post #287366 |
You have been told this before. Your diagrams need to be neat and readable. Your first diagram is so out of focus that we can't even read some of the component designators. The others are so small that they are difficult to read. You could easily expand them to fill the 640 pixel width available ... (more) |
— | over 2 years ago |
| Edit | Post #287366 | Question closed | — | over 2 years ago |
| Comment | Post #287359 |
I suppose that's OK as long as those users do the managing and regular maintenance. If you create that as a paper, I won't get in the way. (more) |
— | over 2 years ago |