Learning the Art of Electronics: 1S Supplementary Notes: Investigating Thevenin equivalent of voltage divider | In The Lab

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This post is part of my video blog and you can find more information about this video.

Silly Job Title: Luminary Luminar. I am the Luminary Luminar!

In this video we continue to work our way through Learning the Art of Electronics. In this video we finish 1S Supplementary Notes: Resistors, Voltage, Current and do Exercise 1.10 from The Art of Electronics which has us investigating a voltage divider.

In this video I recommend to you the book Schaum’s Outline of Basic Circuit Analysis, 2nd Edition and Gary Tuttle’s website gtuttle.net where you can find Thevenin & Norton practice problems.

We use the METCAL PS-900 Soldering Station for soldering.

We use the AiXun H314 Hot Air Gun for heat shrinking.

We use the Pro’sKit SS-331H Desoldering Pump to fix up some of our mistakes.

We use the Tenma 72-10505 Bench Power Supply to provide 15 and 30 V DC to our circuits.

We use the EEVblog BM2257 Digital Multimeter to measure voltage.

We use the Fluke 17B+ Digital Multimeter to measure current.

We use eight of the cheapo Yum Cha DT830B Digital Multimeters as ammeters and voltmeters.

We use the Brother P-Touch D210 Label Maker to label our circuit.

We use the Sharp EL-546L Scientific Calculator to do some basic calculations.

We use the Bysameyee Head-Mounted Magnifier to light up our life.

We use the nmsafety Nitrile Gloves to protect our fingers.

We use the ElectroCookie PCB Prototype Solderable Breadboard to make our circuit on.

We use the WilliamKlein Music Stand to hold our tome.

We use the Scotch Titanium Scissors to snip, snip, snip.

We use the Hakko CHP 3C-SA Precision Tweezers for tweezering.

We use the Plato Model 170 Wire Cutter to cut, cut, cut.

We use the Kaisi S-160 45x30cm Repair Mat as our workspace.

Thanks very much for watching! And please remember to hit like and subscribe! :)

p.s. today I added Luminar, Pro’sKit, Desoldering, Tenma, Yum Cha, Multimeters, Bysameyee, nmsafety, ElectroCookie, Solderable, WilliamKlein, and Hakko to my spell check.

Following is a product I use picked at random from my collection which may appear in my videos. Clicking through on this to find and click on the green affiliate links before purchasing from eBay or AliExpress is a great way to support the channel at no cost to you. Thanks!

Yum Cha 10pcs Glue Removal Razor BladesThis is an image of the product.

Let’s go shopping!

Voltmeters and ammeters

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In this photo we see three voltmeters (across the top) and five ammeters (across the bottom) attached to a voltage divider connected to a load.

30 V is applied then 2 mA flows through R1 and then splits with 1 mA going through R2 and 1 mA going through Rload. 20 V drops across R1 and there is 10 V across R2 and Rload.

Five ammeters and three voltmeters connected to a voltage divider attached to a load

The circuit on the left in the schematic below is the one being tested. In this case R1, R2, and Rload are all 10 kΩ. As R2 and Rload are connected in parallel their effective resistance is 5 kΩ. R1 being 10 kΩ gets two thirds of the voltage because R2 || Rload is 5 kΩ getting one third of the 30 V being 10 V.

The schematic of the voltage divider being tested

Homework

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This is a part of the homework feature of my blog, which is an ongoing conversation with my mate S.F.

Hey mate. Lovely to see you again, as always. Can’t wait to do it all again soon!

I have a note here for “Odd Socks”, but I don’t remember what that was about. Do you?

I mentioned about Elle Cordova. She’s made some really creative and humorous YouTube videos including Grammarian vs Errorist.

You mentioned about Eternal Sunshine of the Spotless Mind.

The sublime is a way of simplifying what you don’t understand.

You mentioned The Road to Wigan Pier by George Orwell.

“Ideas are like fish. If you want to catch little fish, you can stay in the shallow water. But if you want to catch the big fish, you’ve got to go deeper. Down deep the fish are more powerful and more pure. They’re huge and abstract. And they’re very beautiful.” — David Lynch on Big Ideas. In fact he wrote a book titled Catching the Big Fish.

I mentioned about the Sex Ed Sketch from Monty Python’s Meaning of Life. Speaking of Monty Python there was also medical experiments for the lot of you.

I mentioned about Chesterton’s fence which is the principle that reforms should not be made until the reasoning behind the existing state of affairs is understood.

I mentioned about Cantor’s diagonal argument. This method can be used to construct the more numerous real numbers from the rationals.

My essay on Cartesian Dualism is here: 2008-2-PHI130.Essay.2.

I mentioned this humorous sketch: They’re Made Out Of Meat.

The Bang Preventer – aka DIY Current Limiter with isolation transformer

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I asked Tony359 about his current limiter and he referred me to the video below in which he explains his home made contraption. Very cool. I think I should make one of these.

Update: I also found a video covering a similar topic:

The voltmeter used in the second design is this one: Digital AC Voltmeter.

Oh, and here’s another one!

Specs for M5 Pro MacBook Pro

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My IRC friend @ngoldbaum got a new MacBook Pro and I was reading about about the specs over here: Apple introduces MacBook Pro with all‑new M5 Pro and M5 Max, delivering breakthrough pro performance and next-level on-device AI.

One feature which jumped out at me was the insanely fast memory bandwidth. This “unified” memory is on the CPU die and shared between CPU and GPU, which, apparently, can eliminate duplication. The M5 Pro supports up to 307 GB/s and the M5 Max supports up to 614 GB/s.