Activity for Olin Lathrop
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Comment | Post #281444 |
@Kran: My point is that it doesn't matter either way if the design was tweaked experimentally until it produced the desired result. Square versus curved is then just an implementation detail. (more) |
— | over 3 years ago |
| Edit | Post #281444 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Why are antenna PCB traces square instead of rounded? PCB antennas are not designed by electrical engineers, but guys with pointy hats and wands They use trial and error after starting with the result of some mystic ritual including lots of mumbling and waving of the afore-mentioned wand. OK, that's not completely fair, but there is still a high com... (more) |
— | over 3 years ago |
| Comment | Post #281364 |
@Mu3: Remember that the FET likely has a body diode. (more) |
— | over 3 years ago |
| Comment | Post #281353 |
@Curious: You'd have to see what the manufacturer says. As for the 50 Ω to power, that is probably for impedance control, assuming 1:1 transformer ratio. (more) |
— | over 3 years ago |
| Edit | Post #281364 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Design considerations for a synchronous DC/DC converter First, let's clarify something: replacing a diode with a MOSFET switch I have never seen the diode actually replaced. The intent is to have the FET on only when the diode would conduct, but no such timing is perfect. Having an actual diode there allows falling back to the classic case when th... (more) |
— | over 3 years ago |
| Edit | Post #281353 |
Post edited: |
— | over 3 years ago |
| Edit | Post #281353 | Initial revision | — | over 3 years ago |
| Answer | — |
A: How could you model a 10M/100M Ethernet PHY architecture? I'm not going to get into how to model the PHY interface, but will try to explain why there are differences. The type of Ethernet you are talking about is transformer-coupled. The line itself is a differential pair with 50 Ω impedance. However, since a transformer is supposed to be between... (more) |
— | over 3 years ago |
| Edit | Post #281332 |
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— | over 3 years ago |
| Edit | Post #281332 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Why is the resistance of water so high and still so dangerous? Pure water does indeed have very high resistivity (different from "resistance"). Reasons water is dangerous around electricity include: Even small amounts of impurities greatly increase the conductivity of water. The water that you worry about that might contribute to a shock hazard is especia... (more) |
— | over 3 years ago |
| Comment | Post #281323 |
You need to check your math. 110 V across 500 kΩ causes much much less than 200 mA. (more) |
— | over 3 years ago |
| Edit | Post #281307 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Can you call an IC pin 'N.C' if it has hidden functionality? Manufacturers can call their IC pins whatever they like. NC stands for "No connection", as the datasheet even says. There is nothing wrong with that. The only questionable part is "Must be connected to ground" for a pin that is not connected to anything. Without further explanation from the m... (more) |
— | over 3 years ago |
| Edit | Post #281295 |
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— | over 3 years ago |
| Edit | Post #281295 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Max V/Hz value for motor Here is a copy of your specs to make them easier to discuss here: None of those specs really tell you what the V/Hz of the generator inside that motor is. We could take a reasonable guess at if we knew that all the "Rated …" specs were at the same operating point, but that's not clear. What ... (more) |
— | over 3 years ago |
| Comment | Post #281289 |
What do you plan to do about it even if you do find datasheets? (more) |
— | over 3 years ago |
| Comment | Post #281274 |
Nice answer, +1. However, there were ICs well before the 1990s. You may be surprised to find that even back in the 1960s we had sliced bread, flush toilets, and integrated circuits. (more) |
— | over 3 years ago |
| Edit | Post #281066 |
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— | over 3 years ago |
| Comment | Post #281083 |
You originally said this was a radio. Now you say it's a transmitter. Which is it? (more) |
— | over 3 years ago |
| Edit | Post #281096 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Why is it is always power consumption or power delivered more in usage? Power makes sense for steady state conditions. A certain energy will be used over one second. Then the same energy will be used the next second. And the next second. If I told you that such a circuit used 3 J, the first thing you'd ask is "When?", "Over what time?". Only knowing that is used 3 J... (more) |
— | over 3 years ago |
| Comment | Post #281083 |
Something doesn't make sense. Why do you care about harmonics at the antenna level? Surely your tuner will filter those out anyway. As long as the antenna resonates well and has the right impedance at the desired frequency, why do you care how much it picks up harmonics too? The first tank circui... (more) |
— | over 3 years ago |
| Edit | Post #281066 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Is there a particular type of lead-free solder that does not degrade soldering tips? A different type of solder, other than using lead-based solder, is probably not going to help. There are two causes to your problem: Crappy tips. Higher temperature required due to lead-free solder. You can fix the first by getting a good soldering tool. Leaded solder will help with ... (more) |
— | over 3 years ago |
| Edit | Post #281060 |
Post edited: |
— | over 3 years ago |
| Edit | Post #281060 | Initial revision | — | over 3 years ago |
| Answer | — |
A: How building a follower satisfying rather extreme requirements. I don't have a real answer. This is just a suggestion for how to proceed. Look for amplifiers intended to drive 50 Ω cable. Sometimes the term line driver is used, even though that also means other things. If you only needed a few 100 MHz, a video line driver might work, but finding somet... (more) |
— | over 3 years ago |
| Comment | Post #281021 |
It really should be obvious that discussion of *"temporarily not be able to use something"* (like digital currency) has nothing to do with electrical engineering, and is therefore off topic here. (more) |
— | over 3 years ago |
| Comment | Post #281021 |
It is rambling in the sense that its not related to EE. Asking about characteristics of EMP is reasonable. Theory of electricity can be applied to the answer. It might be reasonable to ask how specific devices are effected by EMP, like computers. We don't care what those computers are running, th... (more) |
— | over 3 years ago |
| Edit | Post #281022 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Can there be a global EMP disaster, whether totally natural or partially natural and partly artificial? EMPs (electro-magnetic pulses) occur naturally often. Every lightning strike is one example. Larger EMPs have been created artificially with nuclear weapons. The Starfish Prime H-bomb test caused damage a long way away in Hawaii. There were cases of the wires in street lights getting fused by t... (more) |
— | over 3 years ago |
| Edit | Post #281021 |
Post edited: |
— | over 3 years ago |
| Comment | Post #281021 |
The first part of your question at least is an electrical and physics issue. The rambling about digital currency doesn't make much sense, doesn't actually ask a question, and isn't about electrical engineering. This is why I am going to delete it. (more) |
— | over 3 years ago |
| Edit | Post #280927 |
Post edited: |
— | over 3 years ago |
| Comment | Post #280927 |
@2kind: LEDs usually can't tolerate much reverse voltage either. D2 is not strictly needed according to your specs. If you're fine with the absolute minimum input voltage being whatever the maximum B-E reverse voltage is of the transistor, then you can leave out D2. However, stuff happens, and D2 ... (more) |
— | over 3 years ago |
| Edit | Post #280927 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Isolated Digital Input - Overvoltage protection To summarize, it seems you want a circuit that will detect an input voltage high/low with a threshold somewhere between 0 and 3.3 V, must operate correctly with 0-3.3 V input, but must tolerate input up to 32 V. Snap action (hysteresis) is not required. An opto-isolator is to be turned on when the ... (more) |
— | over 3 years ago |
| Comment | Post #280893 |
*"When input is low, the opto should be off therefore “PIN_PROG_1” should be high"* This makes no sense. When the opto is off, PIN_PROG_1 will be low because it will be pulled down by R73. You can always flip polarity by how the opto output is connected. The opto should be off for the input polari... (more) |
— | over 3 years ago |
| Comment | Post #280893 |
What do you mean by "active low". Should the opto be on when the input is low? You need to specify the full input range (you seem to have only specified the maximum), and what the function of input to output is. What threshold voltage? What input impedance is required? Is a gray area allowed, or... (more) |
— | over 3 years ago |
| Edit | Post #280873 |
Post edited: |
— | over 3 years ago |
| Edit | Post #280873 | Initial revision | — | over 3 years ago |
| Answer | — |
A: My grid dip: how does this electron tube technology work? The video helped explain a few things, but it's still not clear what the overall purpose of this device is. You showed it clearly producing a signal, but the documentation you quote talks about an incoming signal. The meaning of the current shown on the meter is unclear, and so is the function of t... (more) |
— | over 3 years ago |
| Comment | Post #280870 |
Half that page has some foreign script, like Arabic or Hebrew. Besides, I don't want to read a whole manual. *You* should explain in a paragraph or so what this thing is supposed to do, what the user interface is, etc. I've never heard of a "grid dip" before, and certainly have no idea what you th... (more) |
— | over 3 years ago |
| Comment | Post #280870 |
The schematic is pretty hard to read. A better scan at higher resolution would help. It would also help to explain what this device is supposed to do, and what external connections have what properties. It looks like it has pluggable modules at right, some sort of oscillator, and a control to adju... (more) |
— | almost 4 years ago |
| Edit | Post #280822 |
Post edited: |
— | almost 4 years ago |
| Edit | Post #280822 | Initial revision | — | almost 4 years ago |