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Posts by Olin Lathrop‭

317 posts
66%
+2 −0
Q&A Current and voltage in AC circuits without impedance

Since this is homework, I'm not just going to give you the answer. When all else fails, go back to first principles. That's what handy shortcuts, like using impedance, were derived from. In this...

posted 3y ago by Olin Lathrop‭

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Meta 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 ma...

posted 2y ago by Olin Lathrop‭

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Q&A Bandwidth of serial signal

You have to decide what you really mean by "bandwidth". The analog bandwidth of the channel is quite different from the bit rate, which is different from the effective bit rate of the actual trans...

posted 2y ago by Olin Lathrop‭

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Q&A Resistance of digital ampmeter

What you linked to is more of a user's manual than a datasheet. Particularly for more consumer-oriented meters, this spec may not be explicitly available. However, you can easily measure it. Use...

posted 2y ago by Olin Lathrop‭

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Q&A MOSFET not turning completely off

To protect against future changes and to provide something slightly more readable, here is your schematic: There is no immediately obvious reason the FET should blow, but there are a number of i...

posted 2y ago by Olin Lathrop‭  ·  edited 2y ago by Olin Lathrop‭

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Q&A Driving PMSM machine as an AC induction machine

A motor with stator winding and permanent magnets on the rotor, is very different from an AC induction motor. As a result, they require very different drive. You can just apply an AC signal to an...

posted 2y ago by Olin Lathrop‭  ·  edited 2y ago by Olin Lathrop‭

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Q&A Inductance vs frequency

No. An inductance is an inductance. One way to look at an inductance is as an impedance that is a function of frequency:     Zind = ωL = 2πfL Where Zind is the impedance magnitude of an inducta...

posted 2y ago by Olin Lathrop‭  ·  edited 2y ago by Olin Lathrop‭

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Q&A Input offset voltage/bias current noise contribution in operational amplifiers

While input offset voltage is technically noise in the sense that it is something unwanted added to the signal, it is not included in opamp noise specs as far as I have seen. Think of the "noise" ...

posted 2y ago by Olin Lathrop‭

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Q&A Electric circuit with antenna

Antennas are not lumped-parameter systems. They may be open circuits or shorts at DC, but this changes as the frequency goes up. They aren't just a bunch of wires anymore at the intended operatin...

posted 2y ago by Olin Lathrop‭  ·  edited 2y ago by Olin Lathrop‭

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Q&A MOSFET differential to single ended converter intuition

To be clear and protect against possible future edits, here is the circuit being discussed: As you say, this is a differential to single ended converter. In this case, the MOSFETs have likely b...

posted 2y ago by Olin Lathrop‭  ·  edited 2y ago by Circuit fantasist‭

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Q&A Battery voltage: to boost or to connect in series.

To summarize the problem, you have 12 V battery packs that you don't want to change due to certifications, but you need to power a 48 V 4 A load. The battery system also needs to be compatible wit...

posted 2y ago by Olin Lathrop‭  ·  edited 2y ago by Olin Lathrop‭

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Q&A Trouble understanding how to use adjustable LDO regulator

Your question is quite long, so it's not clear what exactly you are asking. It seems the main point is what Microchip means by Note 5 on page 7 of the datasheet: You are right, that makes no se...

posted 2y ago by Olin Lathrop‭  ·  edited 2y ago by Olin Lathrop‭

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Q&A Unexpected phase shift in results

I get a phase shift of 90 degrees between voltage of the capacitor and current through the capacitor which doesn't make sense it should be 45 degrees You don't need a whole circuit to see that the...

posted 3y ago by Olin Lathrop‭

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Q&A Driving ADC with opamp with large rails

Is the risk too great? That depends on parameters you haven't told us. How cost-sensitive is this product? What is the reliability expectation of the users? How mission-critical is its usage? ...

posted 3y ago by Olin Lathrop‭  ·  edited 3y ago by Olin Lathrop‭

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Q&A Contactor control - Higher voltage PWM

Your basic idea is fine, but your implementation is not. C1 makes the whole thing not work, as it will block DC. C2 puts a burden on the switch. D1 would preferably be Schottky. I'll write a mo...

posted 3y ago by Olin Lathrop‭  ·  edited 3y ago by Olin Lathrop‭

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Q&A Estimating the input capacitance of an BLDC motor controller

What is seems you really want to know is how to size a power supply filter capacitor, not what the input capacitance of something is. The objective is to keep the ripple voltage below some value. ...

posted 3y ago by Olin Lathrop‭  ·  edited 3y ago by Olin Lathrop‭

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Q&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 ...

posted 3y ago by Olin Lathrop‭  ·  edited 3y ago by Olin Lathrop‭

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Q&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 c...

posted 3y ago by Olin Lathrop‭

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Q&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 ot...

posted 3y ago by Olin Lathrop‭  ·  edited 3y ago by Olin Lathrop‭

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Q&A What is causing this massive discharge traveling down a power line?

It is hard to know from a single static low-res picture, but my guess is that something caused a short across the high voltage lines. That could be a falling tree limb, a squirrel making an unfort...

posted 3y ago by Olin Lathrop‭  ·  edited 3y ago by Olin Lathrop‭

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Q&A BLDC motor - initial rotor position

This is usually done by driving the motor very slowly open loop at startup. The idea is that the rotor will follow the magnetic field. Once you think the rotor is in sync with the drive, you spee...

posted 3y ago by Olin Lathrop‭  ·  edited 3y ago by Olin Lathrop‭

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Q&A Why is the Linear Time-Invariant System (LTI) dominant in Signal processing?

Linear systems lend themselves to analysis since they follow certain rules. Because of this, much analysis has been done and theory developed, so there is now lots to keep undergrads busy with. M...

posted 3y ago by Olin Lathrop‭

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Q&A PCT2075 temperature sensor accuracy

The text values in the specifications section are always the real specs. Unless otherwise stated (and that's quite rare), graphs are suggested values, typical ranges, variations due to a single va...

posted 3y ago by Olin Lathrop‭  ·  edited 3y ago by Olin Lathrop‭

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Q&A Confused about the amplitude and shape of output voltage pulse

Coquelicot's answer explains what is going on, so I won't duplicate that. However, one of the sources of confusion is that you are looking at the two waveforms in isolation. Your scope obviously ...

posted 3y ago by Olin Lathrop‭  ·  edited 3y ago by Olin Lathrop‭

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Q&A CAN Bus - Internal Oscillator

You are making this too complicated. The only thing that matters is the percentage mismatch between any two clocks on a CAN bus. You seem to imply that you are willing to guarantee the -10 °C to ...

posted 3y ago by Olin Lathrop‭

Answer