MarioL111

Now that you have made the generator, you should be able to fashion a simple ammeter for it using the same principles. Knowing the output can help size the load. Just don't try to reinvent the wheel, it isn't going to get any rounder, lol. I would like to see this with rare earth magnets, and stranded magnet wire such as that used in the deflection coil of an old CRT monitor or television. Good job, great documentation!

I love this.Very attractive shelves!

Precipitate the copper by cementation with iron (cheap and plentiuful-toss in scrap iron if you choose). Other metals can be used in place of iron as long as they are also "higher in the electromotive series" than copper Gold can be cemented out with zinc. Also a good method to separate copper from nickel, noteworthy if you happen to have a bucket of dissolved cupronickel (think coinage).

Muriatic acid is hydrochloric acid with a concentration between 20-32%. It is an out-dated terminology which leads to much confusion.

Above 40% and evaporation creates the need for special handling. You will probably never see >38%.

Do you think the borax method work with the gold fingers as-is, pcb bits and all? I think I'll roast a few in borax just to see if the burnt pcb interferes with separation of the gold. Or a test using silver powder, pcb bits, and borax. No reason to lose gold experimenting.

Nice write-up. High temp silicone o-ring grease prevents this happening again.

3 bags concrete plus water for a 260 pound behemoth. GFRC used correctly could cut that down to under 100. Much stronger as well.

What do you mean by, "...GFRC concrete pours are done in reverse"? I

That "current circulating" is defined as charging. Its a good thing. This is how a parallel-style charger is able to charge multiple batteries at the same time, regardless of whether or not the individual 18650s match each other in spec. Each cell draws what it needs to be charged and no more. My 8p 18650 chargers sense when the group is no longer drawing current, i.e. they are fully charged.

Nicely presented.

I am a little jealous. I fell in love with this type of house as a child. Only one exposed wall, quiet & cozy. And I got to mow the roof....

Not all osb is strong enough for walls/roofs. House wrap won't change that. A layer of loose styrofoam might inhibit moisture, but its hardly protective. For that matter the sand will wick moisture from the bottom up quite well. Do better.

I am jealous.

Awesome-able! Spray paint tech has come a long way, thank a chemist today, lol. I especially like you washing the door with dish soap & water to get it really clean (just don't use one with lotion or emollients).

Surface coatings like poly don't even live in the same world compared to oils. Tung oil is the best of the bunch, boiled linseed oil also works well. Canadianwoodworking.com has more info, with lots of pictures. The image I posted is from their website.

Nicely presented, kudos. Older laptops are built to last.

Very nice. I'm wondering about the TL072 op-amps burning out. At the very least I think they need heatsinks. I like to repurpose laptop heatpipes when I can, they are great. Maybe a perf board with a grounding plane to help dissipate heat? I'm no electronics expert by far so I usually have more Q than A, so I am not qual'd to critique your circuit design.And the audio samples sound sweet. A few seconds into hardrock.mp3 was all it took to become a believer!You have my vote.

Its not about being easy. This box is amazing, beautiful, and very appropiate for vinyl-philes. You get my vote!

I learned a different way. Step 1, join the Navy. Step 2, go to chow. "You have 20 minutes and 20 minutes only in which to eat, you may have 1 fork 1 knife 1 spoon and 1 glass only. Do not step on my brass or touch my glass or you will hold the door and eat last.." Somehow I always ended up on my hands and knees furiously buffing the brass threshold with brasso and a soft cloth. As much as that threshold was polished I wonder if they wear out, lol.

It looks great, but I'm wondering about acoustics and sound quality with the new wall. Any thoughts?

Love it. There is nothing wrong with re-purposing books old and new. There is no shortage of old books.

Yes, water level and flow is extremely important! The pipes should be angled slightly downward at the outlet end to insure that no water can accumulate in one spot. Standing water will cause root rot, contaminating the entire system.

Yes, please.

Excellent use of old computer speakers. I don't think it has the power to make a sub enclosure necessary. I would probably shield the electronics from the drivers (or vice-versa) with an aluminum plate, a common thing to see inside the sub cabinet in an X.1 system. And while we're at it, snatch a couple of used computer case fans to keep the electronics cool. Run at a low voltage to minimize noise. I use 12 volt e-mac fans running at 7 volts.

Lightweight ceiling-grade gypsum board attached to the existing ceiling as is (leave the popcorn be) would work fine. Unless you have nothing better to do than stand on a ladder scraping.

This project deserves to be entered in the Tiny Homes and the Furniture contests!

Fantastamazing! I had to make up a word for how much I love this project!!!

I really like this project, and the motivations behind it. I have a couple of questions, though. Is the OSB used rated for walls, or for floors? How should the structure be anchored? What prevents water damage from underneath? Is styrofoam, even reused, sustainable?

Its a box, on a wall.

My wife had me do this to a 6 foot long coffee table. Used a 4 foot wide section and modified the mechanism from an old recliner for the hinges.

And Kansas has the longest history of prohibition, with the stupidest laws. I wonder if they still require in-state producers to use a majority of Kansas grown feedstock.

Exactly

Not weird, just special. And cross dominant.

Tap water should be boiled for several minutes to expel volatile organics before it is distilled.

$30-50 Al/Zn anode replacement -versus- Waiting for the smell to return to retreat with bleach every time. The anode protects the water heater tank from galvanic corrosion.

If one of the caps bulged, the others on the power supply board are all suspect. No reason to stop now, spend another 2 bucks. Maybe the cap was defective, maybe it was over-volted, both?

Wow. And just think we did this in the 1970s without computers.

A stronger engine will not overcome inherent instability, it must be balanced! Tie a string securely around the rocket tube at the center of gravity leaving a 3 or 4 foot leash. With the rocket prepared for actual launch, swing the rocket around by the leash. An adequately built rocket will "fly" in the circular path you are creating with the nose always pointed in the direction of travel. Else it will wobble, or worse. The exact tuning steps to eliminate the wobble escape me, but should be easy to find online. Hardcore builders will "tune" their rockets anytime they change the mass distribution, such as a using a heavier engine.

Nope.

I think a 10kW dimmer would be robust enough to handle at least a few kW.

and skip the molasses unless you need help with carmelization

"In case you've ever wondered, the name of the battery contains its dimensions. "18650" means the battery is 18 mm in diameter and 65 mm long. The "0" is just hanging out."18 * 1 mm X 650 * 0.1 mm.

Looks and sounds wonderful.

Contact paste will only protect the connection, not the rest of the metal. Galvanic corrosion is stll an issue. Using cables with a lead clamp for the lead battery post instead of cheaper steel clamps makes a huge difference. Permatex 22058 Dielectric Tune-Up Grease is recommended by the manufacturer for your car battery terminals. I've used it on several vehicles and other equipment with 12 Volt lead-acid batteries. Zero problems with any type of corrosion or connections. Dielectric DOES NOT mean non-conductive per se, but rather polarizable. The full explanation of why it works is lenghty and technical. Always read the manufacturer's instructions!

Google "tannic acid coating for rusted iron artifacts" and "Black Dye - Primitive Ways".

nope

That little blue epoxy-looking glob on/in quality cpu/power supply/video card/etc. with the thin cable attached is the thermal diode.

Awesome!

If I hang a towel on it, then its a towel bar.

Yepper, but ours turn clockwise. To anyone asking about heat: if the sides of your fridge are that hot then you have other things to worry about besides spice storage. My 25 cubic foot side-by-side Whirlpool requires only 1/2" clearance for the top and sides and 1" for the back.

And nice job with the win.

I like this. Lighter and easier than my too-costly chain wrench I've used only a few times in the last ten years. You can use a bicycle or saw chain for smaller problems.

Freezing the salted-out IPA will precipitate a lot of the dissolved salt.

How could I use metal oxide anodes in electrolysis and electroplating in my home lab?

It is more correct to write it as HOH when dealing with ionization, think H-OH. End of discussion ladies.

Not really.

Will AgCl work for this?

SS is about 10% Cr, so it should be avoided. Nickel, silver, and graphite rods are good choices. I use graphite rods from old non-alkaline D batteries. They are about 55mm long and 8mm diameter.

It only takes about 15V to split pure water, less for water that has been allowed to absorb CO2 from the air. Less than 1V for sea water.

Setting off homemade explosives can get you prison time, no joke. Otherwise, nicely built.

"Alum" is not used here, and has no specific formula.

Besides, alkaline batteries aren't rechargeable unless special chemistry is used.

Al2(SO4)3 is acidic, Pb is amphoteric. How can this be an alkaline battery? Added H2SO4 should reduce the voltage of each cell since it dilutes the Al2(SO4)3 electrolyte. Expect to dissolve 30-35g Al2(SO4)3 per 100mL H2O for saturation.

Can a similar process work with an AGM battery, either used or new (no electrolyte added)?

Is it really worth it to buy a $200 generator, two $35 transducers, good epoxy, etc? Or should I buy a used unit online? Otherwise, thank you for this info. Nice, simple write-up.

Neither small nor simple. The iteration of Bernoulli's equation I used working on nuclear powered propulsion systems for the Navy has 26 terms. Try again.

This is not pure copper sulphate, it is most likely the pentahydrate. Anhydrous CuSO4 is white.

Polysiloxanes typically have added carbon attached. The carbon makes it organic. Glycerin in water is a great catalyst/promoter.

No to lead! Tin works really well and has a much lower mp.

so wrong. its vapor deposition, not a deep-earth tandori. doubters need to study & research more. diamond is a specific allotrope of carbon regardless of where/how it is created.

Nile Red is a dangerous environmental menace!!! He does nothing unique, rather he seems to be working his way through a book of practical organic chemistry techniques.

https://www.instructables.com/Worlds-easiest-silicone-mold/ Use only clear, 100% silicone sealer/caulk. Try glycerin in water with a touch of food coloring as the catalyst. Mix, mix, mix. Glycerin is mildly acidic, while dish soap is just slightly basic, so pH might be an influenced on set time and consistency. Experiment.