#Cesar #video showing that the fake air conditioner for #cooling is a #fraud.
on 02026-01-10#Cesar #video on mixing polystyrene #materials softened in gasoline with polyvinyl acetate wood glue in order to get a smoothly spreadable waterproofing coating. Surprisingly, the PVA glue mixes homogeneously with the softened polystyrene. Jorge Donadelli, another biochemist from La Plata, suspects that the PVA is emulsifying the mixture. But the demo of waterproofing doesn’t seem very promising actually.
on 02025-11-22#Cesar #video #toread about #hoarding LED lightbulbs
on 02025-11-14#Cesar #video on converting a microwave fan into a household fan by soldering it onto a lightbulb base and heatshrinking a PET bottle over it. #DIY #bootstrapping #hoarding
on 02025-11-11#Cesar #video on a microwave kiln using carborundum in bentonite to paint the walls of a hollow in an alumina firebrick #DIY #bootstrapping
on 02025-11-11#Cesar #video #toread about bluing (“pavonado”) with burnt oil. He cleans it with thinner to degrease it before hanging it in a plumber’s blowtorch flame with baling wire to heat to 500°–600°, then quenches it in used motor oil from a mechanics’ workshop. #jugaad #manufacturing
on 02025-10-18#video by #Cesar about #hoarding HP printer/scanner #electronics #hardware recovering an optical disc encoder labeled “200 LPI” (driven from a DC motor with a toothed belt), some buttons, an external power supply, optointerruptors, a carriage mechanism (with linear tape optical encoder), another motor with encoder from the scanner part, an RGB LED strip (running on 5V with a common anode), a solar fruit dehydrator,
on 02024-09-10#Cesar #video #toread about #hoarding CD and DVD drives. #electronics #hardware
on 02024-09-10#Cesar #video about #hoarding #cellphones #electronics #hardware
on 02024-09-10#Cesar #video demonstrates how to make an oil heating lamp out of four cotton wicks, discarded tin cans, and used (or unused) cooking oil. An upper louver part reaches about 150° and radiates a pleasant heat. I’m pretty sure kerosene would work even better, but actually kerosene is slightly more expensive; it’s about $2000 a liter, while sunflower oil is closer to $1300 a liter, and soy oil is $900.
on 02024-06-12#video #Cesar about #hoarding and recycling TVs and monitors. Magnet wire from the CRT yoke, 0.4mm diameter in one case; a ferrite core which works well as a microwave susceptor; a 40MΩ potentiometer; power transistors; the flyback transformer for high-voltage supplies; a 2-digit 7-segment LED display; an IR phototransistor; electrolytic capacitors; high-voltage ceramic capacitors; switches; clock crystals. He disassembles the CRT to show its parts; he suggests using the shadow mask as a fine mesh screen, and harvests the phosphor from the inside of the screen with a paintbrush, then dissolves the aluminum it’s mixed with using lye. #hardware #electronics
on 02024-05-08#video #Cesar about #hoarding cigarette lighters. Demonstrates making a tiny “Bunsen burner” out of the nozzle by brazing a drilled bolt onto some tubing, then epoxying the nozzle (flow restrictor removed) into it with 10' Poxipol. Then he epoxies a 100mm aluminum tube to a nut, then drills a couple of air inlets into the aluminum tube, but never gets a decent premixed flame. To get a solid base, he fills a Nutella lid with plaster. Demonstrates using the striker wheel (hardened steel) as a dremel cutting wheel for engraving glass by peening the tip of a cut-down nail over it. Demonstrates using the tiny aluminum tubes as cold-peening rivets by hammering a conical expander mandrel into them. Demonstrates depositing ferrocerium shavings onto a paper towel and burning it.
on 02024-05-08cheap pyrolytic stove #hoarding #Cesar #video. He takes two paint cans of different sizes, installing one tightly into a circular hole cut in the bottom of the other with a Dremel, leaving an airspace between the two. The outer can is upside down during operation, so it’s open at the bottom, but since it’s normally sitting on a flat surface, he cuts holes around its base (which would normally be its top) for air ingress. He also drills numerous holes around the bottom of the smaller can, plus a ring of larger ones near its top to let preheated air come into the flame from the sides to ensure a clean burn. He suggests running it on shavings or pellets, or even wax-soaked cardboard cylinders, but not briquettes of shavings or solid wood. His IR sensor says the inner can reaches about 500°.
on 02024-04-03