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Posts by DSI‭

11 posts
83%
+8 −0
Q&A What is this metal panel under power lines?

It is a passive microwave/radio repeater. They were used as an economic way of getting around line of sight obstacles. I came across the information on these researching a way of passively linking ...

posted 3y ago by DSI‭

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Meta How can we grow this community?

I am a little late to the discussion, but I think I can provide yet another perspective. I found my way to this community via searching advice on improving my schematic clarity and found Olin's $...

posted 2y ago by DSI‭

Answer
71%
+3 −0
Q&A Battery voltage: to boost or to connect in series.

Background. I have a legacy battery system that is comprised of twenty-four 12V Li-ion battery modules (self-protected), enclosed in a shell with the charging connection provided as a common groun...

1 answer  ·  posted 3y ago by DSI‭  ·  last activity 3y ago by Olin Lathrop‭

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Q&A What happens when a microSD card is hot-unplugged?

There is no provision in FatFS or the fat32 filesystem in general regarding hot-unplug, so this behaviour depends wholly on the implementation layer for your hardware. As an example, in my use cas...

posted 7mo ago by DSI‭  ·  edited 7mo ago by DSI‭

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+2 −0
Q&A Motor Controller - What might be the purpose of these resistors?

I have watched multiple teardowns of this module, it is, as you have guessed, a capacitor discharge resistor network. The smoothing capacitor in this module is 550+0.68+0.68 uF 430VDC rating. Peak ...

posted 3y ago by DSI‭

Answer
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Q&A Using arc trace routing instead of 45 degree trace routing

Olin has a great answer, I just wanted to add some of my personal experience. I only started laying out PCBs three years ago, and I use KiCad. KiCad got curved traces support in test version 5.99 o...

posted 1y ago by DSI‭

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Q&A micro-RF connector crimping options

I've not seen them sold separately through distributors like Mouser and such, and have not seen any hand tools for these. I found this document and this video - it looks like the machines are semi-...

posted 1y ago by DSI‭  ·  edited 1y ago by DSI‭

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+1 −0
Q&A Siglent1104 oscilloscope channels lagging

Olin's response covered everything I would do in your situation as well. If the problem doesn't follow the probes and doesn't go away, I wonder if due to only two A to D inside the scope, this is t...

posted 2y ago by DSI‭

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Q&A Pick & place file generated by Altium does not match the actual component rotations/positions

Does your produced CPL file correspond to the Altium layout, or to what Eurocircuits Assembly Visualizer is showing? Open the CPL file in Excel and check. If the Altium output is wrong, I'd say ch...

posted 2y ago by DSI‭

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Q&A Testing instrumentation amplifier with differential signal

One of the reasons to follow the advice of your instructor is that page 17 of the datasheet identifies the need for ground return paths for input bias currents. Your initial setup may or may not wo...

posted 1y ago by DSI‭

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+1 −0
Q&A ATX Computer Power Supply Spark in Non-computer Application

Do you supply the PSON# signal before or after the main power comes on, or before connecting the load? Looking at the datasheets, the correct sequence is VAC power on, then PSON# signal to ground,...

posted 1y ago by DSI‭

Answer