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Old 2022-06-28, 22:33   #1
chalsall
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"Chris Halsall"
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Default The importance of layer zero.

So... just to share...

I'm currently working on a very interesting project.

What cannot be measured cannot be controlled.
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Old 2022-06-28, 22:44   #2
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You may be right but then again, measurement may not be required.
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Old 2022-06-28, 22:52   #3
chalsall
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Quote:
Originally Posted by jwaltos View Post
You may be right but then again, measurement may not be required.
You are incorrect.

I always do serious simulations on all of my circuits. They never exactly match the in situ. That's why we spent some coin getting a silly scope into my lab.
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Old 2022-07-11, 21:12   #4
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Default PCB Design and Fab...

This is the part I always dread...

Everything /should/ be correct. But is it? I'll find out in about ten (10#) days...

P.S. Yes, LaurV... I'm using 0805s...
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Old 2022-08-01, 01:12   #5
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So... Just to share...

P.S. I hate making mistakes.
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Old 2022-09-30, 00:57   #6
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So... I have to report to my boss in about 12 hours.

I've done serious stuff. But have nothing to demonstrate.

Sucks to be me.
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Old 2022-09-30, 06:29   #7
LaurV
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Quote:
Originally Posted by chalsall View Post
P.S. Yes, LaurV... I'm using 0805s...
There are a couple of 0402 here ... Sorry, I don't have on hand anything with 0201 right now...
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For scale, the 50 milliohm shunts are 2010, and close to one of them you can see the side of a 1206 which was handsoldered in an oblique position after fact (design mistake, found out during development of the firmware, there is already a new PCB on work; there are also few 0603 handsoldered between the legs of some transistors, one visible above the R in my name - 01C means 10k ohm, and there is a 0402 soldered oblique close to the diode/big hole in the center - everything is "fixed" in the new version). In fact, there is no 0805 resistor there, if I see right. There are few capacitors however, but all the resistors are 0402, 0603, 1206, and 2010. The MCU is a Cortex M0. Sorry I can't show the other end, nor side. But you can clearly see the comparison size on the side of he PCB (the 68.1 ohms are 1206 and the 3 capacitors close to the white connector are 0805).

Last fiddled with by LaurV on 2022-09-30 at 06:47
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Old 2022-09-30, 22:01   #8
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Quote:
Originally Posted by LaurV View Post
But you can clearly see the comparison size on the side of he PCB (the 68.1 ohms are 1206 and the 3 capacitors close to the white connector are 0805).
Super cool! Sincerely.

Now that I have proven my circuit in situ, I'm going to bring my passive components down to as small as possible.

Can't hand-solder 0201 easily, but shouldn't need to...

Edit: Oh, BTW... Are you using the shuts to measure current draw?

Last fiddled with by chalsall on 2022-09-30 at 22:36
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Old 2022-10-10, 09:29   #9
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Quote:
Originally Posted by chalsall View Post
Edit: Oh, BTW... Are you using the shuts to measure current draw?
Yes. The SO8 giant close the them is the opamp to multiply the voltage. This is common way to measure the currents, nothing special. PCB is done by a colleague, not by me, but I had large contribution to the schematic, and I am making the firmware.

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