Activity for Olin Lathrop
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Edit | Post #290779 | Initial revision | — | over 1 year ago |
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A: Why would a standby UPS fail to power devices when there's no power outage? I see that manassehkatz has already given you a good answer and plausible explanation for what you observed, so I'll fill in a few other points. Your battery is 5 years old, so is getting to the point where it could start to fail. I wouldn't expect a 5 year old battery to be bad, but it's to the ... (more) |
— | over 1 year ago |
| Comment | Post #290720 |
You are assuming the domed buttons are capacitive switches. Maybe they are, but I wouldn't rule out that they are simple mechanical contacts. In all the products I've worked on that had these kinds of domed buttons, they were just switches. The on-resistance was up to about 200 Ω or so. I c... (more) |
— | over 1 year ago |
| Edit | Post #290689 | Initial revision | — | over 1 year ago |
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A: What type of button is this on a remote control Such a domed button is usually called a "membrane switch", at least here in the US. As you say, the small metal bubble makes contact with something underneath when pressed. Advantages of membrane switches over the capacitive or conductive sense switches in the rest of your remote include better e... (more) |
— | over 1 year ago |
| Edit | Post #290601 |
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— | over 1 year ago |
| Edit | Post #290601 | Initial revision | — | over 1 year ago |
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A: estimation of pogo pin resistance Is there a scientific way to estimate the resistance of a pogo pin? Ultimately there must be, but it generally requires knowing things you don't know. Worrying about the resistance of the barrel and spring is missing the point. The limiting factor will be the small contact area between the cir... (more) |
— | over 1 year ago |
| Edit | Post #290595 | Initial revision | — | over 1 year ago |
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A: High voltage transformer design When should a transformer core be potted? Whenever you need some of Mechanical ruggedness. High dielectric strength. Minimize vibrations (and therefore audible whine) from capacitive, inductive, piezo-electric and magneto-restrictive effects. Can I place the high voltage conductors... (more) |
— | over 1 year ago |
| Comment | Post #290541 |
Yes, if you isolate the TX and RX signals, then you get around the bi-directional problem. Now you have to isolate at each interface to the bus, though. (more) |
— | over 1 year ago |
| Edit | Post #290541 | Initial revision | — | over 1 year ago |
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A: Most reliable galvanic isolation technology for extreme EMI environments? My first knee-jerk reaction was to use opto-isolators. There are some that have been around for decades and are unlikely to go obsolete any time soon. I wasn't previously aware of these "digital isolators". They seem like they go thru a lot of trouble to ultimately do what opto-isolators do. I'... (more) |
— | over 1 year ago |
| Edit | Post #290501 |
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— | over 1 year ago |
| Comment | Post #290499 |
That literally translates to "music closet", which seems to mean a stand-alone cabinet with assorted audio gear. Apparently that includes a radio, at least in your case. (more) |
— | over 1 year ago |
| Edit | Post #290501 |
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— | over 1 year ago |
| Edit | Post #290501 | Initial revision | — | over 1 year ago |
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A: Weird grounding on a vintage hifi sideboard It has two female inputs on the backside that are labeled as "Grounding". This is incorrect. Imagealttext Take a closer look at the two connections and you will see that the left is labeled "Antenne" and the right "Erde". That's German for antenna and ground. Symbols for antenna and groun... (more) |
— | over 1 year ago |
| Comment | Post #290499 |
What's a "hifi sideboard"? (more) |
— | over 1 year ago |
| Edit | Post #290448 | Post undeleted | — | over 1 year ago |
| Comment | Post #290448 |
I'm not following all your calculations, but I can see that you are not carrying units properly thru all the computations. In several places you show dimensionless quantities on one side of an equation, with units inexplicably appearing on the other side. That's clearly wrong.
Don't be so sloppy... (more) |
— | over 1 year ago |
| Comment | Post #290416 |
Actually the nominal difference from CANH to CANL is only 1.8 V with the bus in dominant state. In any case, I wasn't suggesting to run the LED directly off the CAN bus. I was expecting the other end of the resistor driving a transistor or something. I assumed the OP was planning that considering ... (more) |
— | over 1 year ago |
| Edit | Post #290414 | Post undeleted | — | over 1 year ago |
| Edit | Post #290416 | Initial revision | — | over 1 year ago |
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A: CAN BUS monitoring with a LED CAN lines in the most common implementation have 60 Ω impedance between them. Anything that is substantially larger than that won't effect the lines much. I'd use 1 kΩ at least, preferably more. The lead from the bus line to the resistor must also be short to minimize the characteristi... (more) |
— | over 1 year ago |
| Comment | Post #290354 |
Those ICs don't usually make +-12 V, even with 5 V in. They usually have a two-stage charge pump, so you'll get +-10 V minus a little loss. (more) |
— | over 1 year ago |
| Edit | Post #290357 |
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— | over 1 year ago |
| Edit | Post #290357 | Initial revision | — | over 1 year ago |
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A: Converting 5V to ±12V You say the only thing that will be powered by the ±12 V supplies is a comparator. The first thing I would look at is whether you really need the comparator to run from that voltage range. Presumably you are asking for ±12 V because that is the range of the signals being compared. ... (more) |
— | over 1 year ago |
| Edit | Post #290333 | Initial revision | — | over 1 year ago |
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A: Noise from oscillator on top layer to clock on bottom layer with VCC & GND layers between It's hard to answer your specific case since you didn't label the layers in your picture, or which traces are doing what. That said, a few traces crossing each other on different layers is not much coupling. In most cases of a typical board with a typical "SPI clock signal", there won't be any pr... (more) |
— | over 1 year ago |
| Edit | Post #290331 | Initial revision | — | over 1 year ago |
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A: What fabrication process is being used for jellybean parts I want to know why the top-of-the-line CPUs and GPUs from Intel, NVIDIA, and AMD are all bragging about the fabrication process (7nm and 5nm) and trying to be consistently smaller. It's marketing hype intended to make them look more high tech than the other guy. There is little reason the end use... (more) |
— | over 1 year ago |
| Comment | Post #290284 |
The analog filter rolloff is around 9 Hz, so 60 Hz should be about 16 dB down. Power frequency here in North America is 60 Hz. There will always be some power line noise, but shouldn't effect settling time. (more) |
— | over 1 year ago |
| Comment | Post #290284 |
Errors in software are always possible, but the same software exhibits much longer settling times at lower resistances, and these vary by capacitor. (more) |
— | over 1 year ago |
| Edit | Post #290284 |
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— | over 1 year ago |
| Edit | Post #290284 | Initial revision | — | over 1 year ago |
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Ceramic capacitor "memory" effect? I have run into an interesting phenomenon related to ceramic capacitors. This question is part of the effort to understand the issue, and eventually work around it. But first, some background of this particular situation is required. Device background I have designed a high-accuracy 32-channe... (more) |
— | over 1 year ago |
| Edit | Post #290172 |
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— | over 1 year ago |
| Edit | Post #290172 | Initial revision | — | over 1 year ago |
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A: Can I make an AC inductor (reactor) rated 75mH 40A from a 3-phase induction motor? An induction motor with its shaft held still will mostly look like an inductor with a series resistance electrically. However, there will be some issues: It will be difficult to guess the inductance from the motor datasheet. There will probably be higher effective series resistance than for a ... (more) |
— | over 1 year ago |
| Edit | Post #289853 |
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— | over 1 year ago |
| Edit | Post #289862 | Initial revision | — | over 1 year ago |
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A: Will shorting a lithium ion battery cause an explosion? Since you seem to be asking about whole batteries, not individual bare cells, dangerous effects should be limited. Consumer batteries made from lithium cells almost always include integrated protection circuits. These prevent over-charging, too deep discharge, and probably also mitigate shorts some... (more) |
— | over 1 year ago |
| Edit | Post #289853 | Initial revision | — | over 1 year ago |
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A: What are some best practices for library management? I don't know about "best practices", but I make all my own library parts. I use Eagle, and the library parts that come with Eagle are quite inconsistent in things like pad shapes, what is shown on the silkscreen, size of lines and text, what goes into the various layers, etc. It might be tempti... (more) |
— | over 1 year ago |
| Edit | Post #289801 | Initial revision | — | over 1 year ago |
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A: derating MLCC ripple current for transient current spikes how much higher can i go in current ripple RMS None, of course, at least if you want to rely on anything else the datasheet says. The heating is a function of the RMS current. No, you don't get to cheat physics. Calculate the RMS of the pulse waveform, and make sure that doesn't exceed what t... (more) |
— | over 1 year ago |
| Edit | Post #289710 | Initial revision | — | over 1 year ago |
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A: Burned Source Driver - Noise Spikes from Relay Coil At first this sounded like it might be a classic case of forgetting the flyback catch diode across the relay coil. However, now that you've posted a schematic we can see that a diode is built into the driver chip for each output. That leaves two possibilities I can think of, power overload and gr... (more) |
— | over 1 year ago |