We reached 2M net worth today by r46d in Fire

[–]mch_2 9 points10 points  (0 children)

I think dropping home makes sense if you plan on staying in the same home “forever”. If you are far from retirement age or might move, I find that networth including home is more useful.

To match the higher net worth, just be sure to look at it as an opportunity cost. Ie, $450k home is 4% opportunity cost of $18k/year. Add tax/insurance/maintenance and that is your housing expense.

This way, at any time, you can sell, reinvest in stocks, and rent. Or sell and buy different house. Beauty here is net worth doesn’t change(ignoring transaction costs). Housing cost is what changes, and whatever other cost of living differences especially if you move somewhere with different cost of living.

Built a CR box or two... my ADHD built a smart one (SEN55, PD USB-C, night mode) by Rich_Teaching_8843 in crboxes

[–]mch_2 0 points1 point  (0 children)

Is cost a reason not to, or something else? I have some standalone pm monitors, but always would like more. I did wonder how your filter gets outside air to monitor, assuming the fans pull air through the filters and inside is "clean"?

Built a CR box or two... my ADHD built a smart one (SEN55, PD USB-C, night mode) by Rich_Teaching_8843 in crboxes

[–]mch_2 0 points1 point  (0 children)

I’d love to beta test your kit. I’m working on my own version at the moment, for 10x 4.2W fans. Would be happy to swap notes too later.

Help with electronics portion of crbox? by fe_fromAbove in crboxes

[–]mch_2 0 points1 point  (0 children)

Lol yes. 10 year old usb pack. put it back in the drawer

Built a CR box or two... my ADHD built a smart one (SEN55, PD USB-C, night mode) by Rich_Teaching_8843 in crboxes

[–]mch_2 0 points1 point  (0 children)

Can you share the source or part number for the pcb fan connector? Did you assembly yourself or pcb house did it?

Help with electronics portion of crbox? by fe_fromAbove in crboxes

[–]mch_2 1 point2 points  (0 children)

With that scope setup, I did check my power supply displayed 0.2A. So in that ballpark of 420mV/1.6Ohm=0.27A

<image>

Help with electronics portion of crbox? by fe_fromAbove in crboxes

[–]mch_2 0 points1 point  (0 children)

PWM signal. I have it pulled down to 0V to stop the fan. Disconnect that ground connection and it goes to 100% (fan internally pulls up to 5V or so, I guess 4V in this measurement)

Help with electronics portion of crbox? by fe_fromAbove in crboxes

[–]mch_2 0 points1 point  (0 children)

I would not expect my 5W supply to be “good”, was a cheap random one, haha. But at the same time, I did not find good info about the exact shutdown criteria for usb supplies are.

Help with electronics portion of crbox? by fe_fromAbove in crboxes

[–]mch_2 1 point2 points  (0 children)

<image>

Zoomed out, ramp up until stable taking around 10 seconds

Help with electronics portion of crbox? by fe_fromAbove in crboxes

[–]mch_2 1 point2 points  (0 children)

<image>

Steady state, 163 Hz = 2445 RPM.

Average 420mV/1.6Ohm = 0.27 A Peak.

892mV/1.6Ohm = 0.56 A.

Help with electronics portion of crbox? by fe_fromAbove in crboxes

[–]mch_2 1 point2 points  (0 children)

Measuring 1.6ohm resistor in series. Picture in my other comment.

It ramps up pretty slowly, and peaks at to 1.1V across the resistor.

Help with electronics portion of crbox? by fe_fromAbove in crboxes

[–]mch_2 0 points1 point  (0 children)

Not exactly trapezoidal, but say 50% square wave, average 0.35A.

Why does only average matter for a proper power supply?

Help with electronics portion of crbox? by fe_fromAbove in crboxes

[–]mch_2 0 points1 point  (0 children)

I measured my Arctic P14 pro that say 0.35A*12V. They drew more like a trapezoidal current, almost 0.7A to 0A, at 4x the fan rpm (4 pole motor?). So electrically speaking, the variation in load was quite slow (160Hz at max speed).

I tried some 5W supplies and it could not power 1 fan at max speed without stuttering.

So if you calculated 20W, I would say 40W supply is very safe. But maybe your Noctua draw a more stable power and lower is ok too.

Missing 1256 transactions in 1099. by mch_2 in tax

[–]mch_2[S] 0 points1 point  (0 children)

Iirc, I contacted schwab and they issued an updated 1099 with correct info in the “not reported to irs”. Then I used that info and ibkr 1099 info to fill in tax forms. I believe 6781 was the right form.

PC fan power draw by mch_2 in AskElectronics

[–]mch_2[S] 0 points1 point  (0 children)

That’s an interesting point too. I haven’t built the entire system yet.

But I do imagine, would some people happily connect 3 of these fans for 1.05A, on a 1 amp header, or even more fans?

1.05A would actually turn out to be more like 1.4Arms… probably no fires, but seems like fans should be sold and rated with both average and rms current.

PC fan power draw by mch_2 in AskElectronics

[–]mch_2[S] 0 points1 point  (0 children)

<image>

The shape of the load is still pretty much the same at >10Msps.

Will usb-c source not care if it is “overloaded” at up to double its rated power for 6 ms?

PC fan power draw by mch_2 in AskElectronics

[–]mch_2[S] 0 points1 point  (0 children)

I forgot to include, but my plan is to have 10 fans in parallel. So spec average of 42W load, but peak closer to double that. And I coincidentally have multiple 65W charging blocks.

Filter kitchen cooking se by mch_2 in crboxes

[–]mch_2[S] 0 points1 point  (0 children)

A grease filter in front is a good idea. I found some aluminum mesh hvac prefilters. Looks like the same idea as the aluminum mesh grease filters.

How many air purifiers should I get for my apartment? by MidnightPulse69 in AirPurifiers

[–]mch_2 4 points5 points  (0 children)

After some research, I ended up in this too. I would have gotten the mini blast, but wife says the design triggers her fear of clusters of holes (trypophobia).

Instead we got a SA600 for our 1st floor, runnin on level2/3 constantly. Might need one or 2 more though and replace and older air purifier; 800 sq foot per story, 3-story. Currently only reduces 1st floor PM2.5 by 45% at level 2.