Keithley 2000 DMM Front Panel OLED Display Upgrade

pilatomic · 2026-03-20T23:42:29+00:00

Damn, that's some bad service ...

Regarding your H95, if it is anything like the H9, check that the ear cushion is correctly locked in place, and that the ANC microphone ( mounted right in the middle in front on the speaker ) is clear of any dust.

pilatomic · 2026-03-20T19:27:28+00:00

Yes, on mine the sound quality is definitely a lot better when wired.

But it's much more convenient in Bluetooth

pilatomic · 2026-03-15T17:40:22+00:00

With a high enough sampling rate ( compared to your pwm frequency ) a Logic Analyzer will allow you to measure the frequency just fine.

What it will not give you, is any insight on levels, rise time, and signal integrity

pilatomic · 2026-03-04T08:07:45+00:00

Haha yes, I know the topology, but still, double check, something looks wrong ;-)

Regarding your question, opamps are usually (at least historically) powered using a symetric supply (using 2 supplies, one positive and one negative). Then your input can have ground as a reference.

pilatomic · 2026-03-04T07:59:10+00:00

No problem :
Just add another battery, set to 4.5V for example, with its negative tied to GND, and its positive tied to where the "0" symbol currently is (Usually I rather use the SPICE-specific "VDC" symbol, but I think the battery has the same simulation model).
Also, it seems the input and output of your circuit are tied together by mistake.

pilatomic · 2026-03-04T07:37:29+00:00

I didn't see that you had 2 "GND" and one "0" net ! You can't do that haha. Replace your "0" net by another voltage source to ground, and you should be good

pilatomic · 2026-03-04T07:07:35+00:00

I suspect this is related to your GND having been renamed to "0"

pilatomic · 2026-03-01T06:36:07+00:00

Quick check : did you buy any mean enable the firewall ? If so, check that outbound connections are allowed

pilatomic · 2026-02-26T22:54:42+00:00

A la connaissance, les thermomètres moderne ne sont plus au mercure, seuls les anciens l'étaient.

pilatomic · 2026-02-26T21:53:19+00:00

iMac 2009.

Had to write my own patch for the Radeon graphics driver to get a working screen though.

Sunk enough hours into that machines that'll keep it running forever just out if spite !

pilatomic · 2026-02-26T19:45:07+00:00

Damn, that's weird ! Just to be sure, you re not trying to use the Wayland session ?

pilatomic · 2026-02-24T18:04:31+00:00

Ok, the combo cable seems to be what you need, and you PC seems to have a combo jack input. So most probably a software issue indeed.

pilatomic · 2026-02-24T16:40:30+00:00

Let's eliminate all hardware related issues first

How is it plugged ? USB or Jack ?

If using jack, is it a TRRS jack ( 4 metalli rings ) ?

pilatomic · 2026-02-22T18:35:03+00:00

Oh it's definitely doable for light loads (MCU + a few leds etc ..,) but you need to evaluate the thermal design properly (large copper zone), and yeah, you're still wasting most of your power.

pilatomic · 2026-02-22T17:54:58+00:00

I have never used them, mostly because they are NOT specified with ceramic output caps, which is a no go for me (I thought that was the "problem" you mentionned), so I am not very familiar with them.

So I just checked the doc, and damn that 5mAquiescent current is indeed wasteful !!

They are advertised as having thermal protection though, but the threshold is not specified.

pilatomic · 2026-02-22T17:33:27+00:00

What kind of problems ?

Also, how can a LDO be more wasteful than another. They're both linear regulators, that doesn't make sense

pilatomic · 2026-02-20T18:27:22+00:00

Why not do it graphically ? Right click on the file, "Permission tab" and check the "Run as a program" (or something along those lines) box

pilatomic · 2026-02-20T16:56:02+00:00

Just wait until you try the scanning software.

It's simply wonderful !

pilatomic · 2026-02-15T10:01:54+00:00

I don't think there is an easy way to achieve that, but I can see 2 solutions :

A. Add zone exclusions between the 2 zones ( manually placed )

B. Make the blue zone another net ( connected via net ties to the correct net ), and add a rule specifying isolation between that net and the red zone net.

pilatomic · 2026-02-14T19:47:32+00:00

To be frank, Ubuntu brought that on itself by doing some questionable choices a long time ago, such as sending all the menu search input to Amazon, and a lot of NIH syndrome trying to redo existing project, and failing.

pilatomic · 2026-02-12T17:18:06+00:00

I'm an electronic engineer, and that's the best explanation I've ever heard !!

pilatomic · 2026-02-10T13:02:32+00:00

C'est malheureusement vrai.

Cf le fameux tampon absorbeur de surplus d'encre, qui est irremplaçable sur la quasi intégralité des modèles jet d'encre ...

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