Posts by Olin Lathrop
There are a number of misconceptions here. bode plot db/Hz First, it's "dB", not "db". Second that's not a Bode plot. Those are dB/Log(Hz). In other words, a certain frequency ratio results in...
Simple filters don't cause a fixed ratio change in amplitude (dB) for a fixed change in linear frequency (Hz). Making the amplitude change by -0.1 dB/Hz would be very difficult. This could be don...
If all four channels are really connected to the same signal in the pictures you show, then there is indeed some skew between pairs of channels. Try swapping probes to see if the lag goes with the...
I don't think there is a simple way to inherently limit the current to 10 A. The best approach seems to me to add a low side current sensor between the bottom of the H bridge and ground. The main...
Firstly, is this calculation for power dissipation correct? P = (I2 * R) + (I * V * (t_on+t_off)/2 * f) = 0.517 W Not completely. There are two separate parts that need to be considered. I2RDSO...
This is not a direct answer, but a few observations that might be clues. The additional pictures help, but you still haven't answered where this is. The purpose of the question was to get some id...
The expansion of the conductors is the least of your problems. The real issue is the effect of excessive temperature on the insulators. The plastic in the cable has three electrical functions: T...
Unfortunately the frequency legend on your graphs are too small to see, so we don't know how the left and right graphs relate to each other. However, what is certainly going on in the left graph i...
I'm not sure what you mean by the "Re" model, but ultimately the transistor does a certain thing regardless of what label we put on the circuit it is in. For a NPN like you're modeling, you will h...
It seems like you did the reduction to a Thevenin source mostly right, although the final value is a bit off. The original circuit we want to reduce to a Thevenin source is: First we reduce V1,...
I see that Monica answered your question directly. However, there is another point to keep in mind. Comments are not for content. That was supposedly the case at SE too, but was poorly enforced....
You should not be relying on the internal circuitry of whatever senses the 4-20 mA current. Note that the two implementations you show both use current sense resistors. The only difference is the...
No, a resistor divider is not appropriate, at least not if you want to get all the information from the STAT pin. In addition, that chart in the datasheet is incomplete at best, or downright misle...
Since your noise has "unknown characteristics", you should do low pass filtering in analog before the discrete sampling of the A/D. The two parameters that matter are the frequency content of the ...
It seems your main question is why all the comments to your question about reactance were deleted. I deleted them because they were no longer relevant. They pointed out problems with the question...
If you're really sure the symptom appeared right after the static discharge, then something in the front end of the amplifier may have gotten damaged. However, that sounds rather far fetched. Sco...
Nevermind (for now) what Wikipedia or anyone else says. Stop and actually think about it. One problem with the question is that is says "buck-boost" but doesn't otherwise define that. A buck-boo...
It appears you want a positive current source with the following specs: 0 to 28 V compliance range. Up to 100 mA, adjustable via 10 bit or more digital value. 36 V supply is available. The diss...
Yes, you seem to understand the concept. From the case to the ambient air, there will be 1.3°C per watt across the pad, and another 2.0°C per watt across the heatsink. In total, there will be 3.3...
There are two issues with input voltage ripple: The input voltage being too high or low for correct operation, and high frequency noise on the input. The first is pretty straight forward. You mak...
Your description is confusing due to lots of hand waving, so it is hard to be specific. However, an isolated section should be separated from the non-isolated parts laterally. It depends on the e...
Considering that the same manufacturer has models specifically for plated holes too, it probably matters. One thing that I noticed in looking around is that the models for unplated holes have a kn...
There are two predominant reasons you see N channel FETs more than P channel: N channel is the natural polarity for ground-referenced switches controlling loads with positive voltages. This is co...
One of the aggrevations Elsewhere were all the vandal and retribution downvotes. They never took the problem seriously. Now it's happening here. Andy was the latest target, twice, recently. I'v...
We have such low volume as it is, that I wouldn't want to see another category added at this time. It would only emphasize how little traffic there is. Let's not make the same mistake that Photog...
