EMC question of the week (from LearnEMC).
learnemc.com/qotw-260302
02.03.2026 19:03
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There was a time when capacitors were known as condensers.
William Thomson, Lord Kelvin.
EMC question of the week from LearnEMC.
learnemc.com/emc-question...
With 1 µm copper plating on thick nickel, the effective conductivity is better than if the trace was made fully from copper.
Did you know that adding a thin plating of good conductor on badly conductive material in RF transmission line can have lower loss at RF than trace made fully of either material by itself? Thought this was a bug in my solver at first, but it's a real physical effect.
I didn't know. And does it matter if it's over or under?
My favourite cat on Bluesky🐾
That's right. I didn't know the signal could reach 5 V.
In the slope amplifier, I don't see why the gain can't be e.g. 100.
I'm curious. I'll do a search of slope amplifiers.
Great! I believe that reducing the upper resistor by ten (and therefore the gain), reduces tau of this resistor with the capacitance of the diodes (both) by 10 and the slope improves. Why don't try to reduce the 1 k resistor to 100 ohm?
Reduce both Rs 1 k and 100 k by 10 and it will be an improvement.
I believe that is the capacitance of the junction of both diodes.
It’s unbelievable that a spectrum analyzer costs that much money.
It's not the bias current because it's very small 0.5 pA to 10 pA.
Bet lost.
Yes, OPA140 has 20 V/us. You could try to heat up the diodes and see the response.
Could the response time be increased due to the probe's capacitance? You could try to add a second probe to test it. The datasheet says 115 ns for 5 pF, but LF probes could have easily 20 pF. A second variable could be Rc the pull-up R.
I guess you expect 300 uV because it's the offset voltage of the integrator.
I believe that the circuit is integrating the current due to the Voffset/Rintegrator.
The circuit integrates the bias current as well.
What is the function of channel 3? Does it come from a comparator or an opamp as a comparator? In that case, there is always a delay.
I bet that channel 2 does not follow channel 4 (x gain 100) due to the limited slew rate of the opamp.
Channel 4 is an input of an operational amplifier (not the opamp pin, but the resistor)?
Browser based 2D field solver I've been writing for a while is now up. It calculates characteristic impedance and losses for many common and less common transmission lines.
For decades, electronics offered 2 levels of routing structure to manage signals that originate or terminate in an IC. Recently, that number has risen to 5, bringing greater complexity and design decisions
semiengineering.com/an-explosion...
#interconnects #semiconductor
I've been writing online transmission line field solver for a while. It will calculate impedance and loss for many PCB transmission lines. Supports solder mask, S-parameter export and more. Missing just last polishing and testing.
I love this base circuit you use to make projects!
I've found that 'audio' comes from latin: 'I hear' and video from latin too: 'I see'.
This is how a 1.33 uF 600 V 450 A looks like. Take a look at the SMD 1206 capacitor at the top left corner for comparison.
Printed Circuits Handbook
Seventh Edition
archive.org/details/isbn...
