Activity for Olin Lathrop
| Type | On... | Excerpt | Status | Date |
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| Edit | Post #285730 | Question reopened | — | almost 3 years ago |
| Edit | Post #285815 |
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| Edit | Post #285815 |
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| Edit | Post #285815 |
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| Edit | Post #285815 |
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| Comment | Post #285814 |
Your updated schematic is much better. I guess we can put the tars and feathers back in the closet now :-) (more) |
— | almost 3 years ago |
| Comment | Post #285814 |
What's with the stars in the title? Trying to be special at the expense of others is not cool. I deleted them. Don't do that again.
We shouldn't have to tilt our heads to read a schematic. Rotated labels are annoying. Also, try to keep high voltage at top, low voltages at bottom, and logical ... (more) |
— | almost 3 years ago |
| Edit | Post #285814 |
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— | almost 3 years ago |
| Edit | Post #285815 | Initial revision | — | almost 3 years ago |
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A: PNP Darlington pair as a current limiter Follow the current. Q3 is a controlled current sink. Whatever voltage is applied to its base appears across R11 minus the B-E drop. That voltage on R11 causes a particular current to flow. That current obviously flows out of the emitter of Q3. Due to the transistor's gain, most of that comes f... (more) |
— | almost 3 years ago |
| Comment | Post #285737 |
You got another downvote from an imposter account posing as me. That wasn't me, and the account has been disabled. When the account is eventually deleted, the downvote will disappear. I left it there for now so that the Codidact team has a better chance of tracking down who did it. I'll delete th... (more) |
— | almost 3 years ago |
| Comment | Post #285737 |
I don't understand the downvotes either. I upvoted. Unfortunately, I can't see who downvoted, only look at general trends. I think all downvotes should be public, but the Codidact team is still against that. (more) |
— | almost 3 years ago |
| Comment | Post #285787 |
It's your paper, so use whatever process you're comfortable with. Personally, I've found trying to make something a community effort to be far more trouble than it's worth. One person's coherent vision is usually better than a bunch of people's ideas all jumbled about presented in patchwork styles.... (more) |
— | almost 3 years ago |
| Edit | Post #285786 | Initial revision | — | almost 3 years ago |
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A: H(jω) does not exist for unstable systems, but we still use it when designing controllers - contradiction? I think this is partly semantics. For example, consider designing a compensator for a power supply. The transfer function under consideration is essentially the open loop impulse response of the system. If that goes nuts, then you have other problems to fix first. You are right in that it needs... (more) |
— | almost 3 years ago |
| Edit | Post #285785 | Initial revision | — | almost 3 years ago |
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A: Creating a FAQ: how to read a datasheet I think this would make a good Paper. I know you want others to collaborate, but that's something that doesn't really work. "Community Wiki" certainly never worked right on SE. Too many cooks make a mess, no matter how good each cook is. Go ahead and write a paper. If the result is good, I'l... (more) |
— | almost 3 years ago |
| Edit | Post #285730 | Question closed | — | almost 3 years ago |
| Edit | Post #285730 | Post undeleted | — | almost 3 years ago |
| Edit | Post #285725 |
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— | almost 3 years ago |
| Comment | Post #285725 |
Yup, that does smell like an ESD problem. (more) |
— | almost 3 years ago |
| Edit | Post #285725 | Initial revision | — | almost 3 years ago |
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A: How to protect RF switches from ESD? Those are good questions, and I don't have a single definitive answer for them. I'd start with putting an appropriate TVS (or maybe separate diodes to ground and 3.3 V) between C3 and S1. My reason for clipping there is because then this gets to work against the impedance of the inductor. Look c... (more) |
— | almost 3 years ago |
| Edit | Post #285693 | Initial revision | — | almost 3 years ago |
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A: How to calculate the RC filter of a TCXO for a RFIC reference? The RFIC manufacturer recommends to "add filtering caps" for high RF output cases. It seems your questions are really about this RF IC, not the oscillator. The oscillator itself seems to be pretty straight forward. You apply power and an accurate frequency comes out, which is 30 MHz in your case... (more) |
— | almost 3 years ago |
| Edit | Post #285685 | Initial revision | — | almost 3 years ago |
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A: Choosing Y value in photoresistor graph If you truly have a photoresistor, then resistance as a function of brightness makes more sense. It's the resistance that is roughly constant for a fixed brightness as voltage is varied. Put another way, the current is roughly proportional to voltage at any one brightness. However, if you actual... (more) |
— | almost 3 years ago |
| Edit | Post #285661 |
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— | almost 3 years ago |
| Edit | Post #285661 | Initial revision | — | almost 3 years ago |
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A: Electromagnetic induction You are asking about this circuit and want to know whether this is a radio transmitter/receiver system. No, it's not. First, everything is DC. There is no radio propagation at DC (0 frequency). Second, although the question mentions antennas, there are none in this circuit. Radio tr... (more) |
— | almost 3 years ago |
| Comment | Post #285657 |
Your whole picture is 1152 x 1275 pixels in size. Only about 680 x 370 pixels, or 17%, has any useful content. We require questions here to be well written, with proper schematics or diagrams when required. Dumping something with 83% useless content on us is just plain rude. That's probably what ... (more) |
— | almost 3 years ago |
| Comment | Post #285657 |
Without a schematic or a system diagram, this is a non-question. We do engineering here, not hand waving. (more) |
— | almost 3 years ago |
| Edit | Post #285652 | Initial revision | — | almost 3 years ago |
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A: Standardized schematic/layout file formats for PCB CAD tools? As far as I know, there is no standard format, at least not one supported by many packages. What I would look for instead is the existence of converters. Check the ability of a tool to export or import in another's format. Then ask around and look at reviews to find the quality of these converte... (more) |
— | almost 3 years ago |
| Edit | Post #285458 |
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| Edit | Post #285458 | Initial revision | — | almost 3 years ago |
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A: How do I design a flyback converter? What are the basics I should know? I see Andy has already given a detailed answer with a lot of good background on flyback converters. I'll answer the question more directly about how I would step thru this design if given these requirements. For reference, here is the general flyback converter circuit copied from the question:... (more) |
— | almost 3 years ago |
| Edit | Post #285406 | Question closed | — | almost 3 years ago |
| Comment | Post #285392 |
I liked your write thru step 6. The schematics are nice and clear, and you show incrementally how you end up with the classic instrumentation amp.
Then you're back to those cluttered diagrams. I know you think they illustrate, but honestly, they just look like a mess to me, where it's hard to fi... (more) |
— | almost 3 years ago |
| Edit | Post #285377 | Initial revision | — | almost 3 years ago |
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A: PCB Copper Layer Spacing & Voltage Rating I am not familiar with that standard specifically. However, usually standards will have some multiple for effective separation distance inside a PCB versus across air. One standard I remember specifically states that PCB material is worth 6x the distance relative to air. This method gets around ... (more) |
— | almost 3 years ago |
| Edit | Post #285367 |
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— | almost 3 years ago |
| Edit | Post #285367 | Initial revision | — | almost 3 years ago |
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A: Design considerations for a differential pair As far as I know from my own experience, CAN and at least 10 Mbit twisted pair ethernet both care about the impedance between the two wires, not so much from each wire to some common ground. This is quite obvious for ethernet since the twisted pair drives a transformer. There is no third conducto... (more) |
— | almost 3 years ago |
| Edit | Post #285349 | Initial revision | — | almost 3 years ago |
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A: Via on pad: acceptable or not? This can be OK if you consider and address the consequences carefully. It's something I would only do as a last resort. Usually I try to make sure the hole itself is outside the outline of the pad, and therefore covered with soldermask. The major problem I see is the via making a thermal connect... (more) |
— | almost 3 years ago |
| Edit | Post #285325 | Question closed | — | almost 3 years ago |
| Comment | Post #285325 |
What is the "line" in this case? Both Y and Delta have three power "lines". Talking about a single voltage or current phase doesn't make sense without identifying which of the three, or something else.
I'm getting tired of playing "20 questions" here. I gave you some slack by leaving the questi... (more) |
— | almost 3 years ago |
| Comment | Post #285325 |
But what do those mean? What's Y-Y (or star-star) as opposed to just Y, for example. Also, clarifications need to be in the question, not buried in a comment. (more) |
— | almost 3 years ago |