#Murray-Smith #video about making a position sensor from #hoarding a mouse. #electronics
on 02026-08-24#Dr-Volt #video #toread about #microscopy with a Blu-Ray laser. #hoarding #electronics
on 02026-08-24The Abov MC96F6432 or very similar is the microcontroller in this microwave oven. #hoarding #datasheet #PDF
on 02026-06-25is Ali’s Surplus Stuff in Elk Grove, California, south of Sacramento:
“Vintage Electronics - VCR, iMacs, Projectors, Oscilloscopes etc. for sale. Electronics galore. We are a Surplus Store. More often than not, these items are untested. We have a wide variety of Vintage Electronics. Come on by and check it out. Price varies..
“Please call me, if interested. You can come by and check it out during regular business hours 10 am - 5 pm Monday - Friday and 10 am - 3 pm Saturday.” #hoarding
on 02026-05-17#JSK-koubou #video of #jugaad spot welder #electronics using a 555, a bunch of IRLB3034 MOSFETs, some copper cables, and an old car battery (#hoarding). Someone should tell him about transformers, though, and about MOSFET TO-220 tab electrodes. And I don’t agree that burning the wooden backing board at 10ms means that too much heat went into the 200μm nickel strips he’s trying to spot-weld together. He’s still able to peel the "weld" apart with pliers, which to me means that he got inadequate penetration. He has an ingenious and amusing solder-free zip-tie technique to connect the electrodes.
on 02026-05-17#video channel on YouTube about #hoarding and #DIY/#jugaad
on 02026-05-15#video of recycling aluminum in a home bucket charcoal forge with a fire extinguisher crucible. #manufacturing #hoarding
on 02026-04-27Chris Cecil #ccecil on #hoarding ewaste pick-and-place machines #toread
on 02026-04-09"Urban Ore" at 900 Murray in Berkeley sells all kinds of recycled junk. #hoarding #tourism
on 02026-02-24#video on “can I make a #precision component from scrap metal?” by #not-an-engineer. #hoarding #toread
on 02026-01-13another yarn #hoarding #tutorial #video #toread #fiber-arts
on 02026-01-03#video by the rather formidable #Engineering-Knits claiming that for US$8 at the thrift store you can find silk sweaters, cashmere sweaters, and wool sweaters to unravel for #fiber-arts. But for some reason the one she’s unraveling is 25% acrylic. Has the very important tip that moth-proofing is a must-do #1 priority; she prefers baking her sweaters in the oven at 75° for 40 minutes, but puts her plastic sweaters in the freezer for three days to kill the moth eggs. Repeats the tip about looking for chain-stitched seams holding together finished knit edges. Runs into alternating rows knit with two different yarns, so the sleeve (for example) becomes two equal-length balls of yarn, but two different yarns. She prefers washing her yarn after unraveling the garments rather than before. She demonstrates her motor-driven unraveling machine, her manual ball winder, and a machine she uses for plying the yarn up into a thicker gauge multi-ply yarn. #hoarding
on 02026-01-03#video on #hoarding thrift-store sweaters for yarn for knitting or #crochet; she recommends looking for finished edges of knitting at the seams, if there are seams, rather than cut edges sewn together with a serger. She washed the garments before unraveling them; this caused her roving-yarn H&M sweater to pill up, which caused it to snag a lot when she was unraveling it onto her yarn winder. She got a pretty staggering amount of yarn actually, 400+ “yards” from the US$5.75 H&M sweater, about 25% of the cost of new yarn, while the Style & Co. sweater gave her 2400 “yards” of very fine yarn for the same Goodwill price, one tenth the cost of new yarn. But she spent 14½ hours buying, seam-ripping, and unraveling. I feel like you could unravel the sweater panels while you were knitting or crocheting something new from them. #fiber-arts
on 02026-01-03#optics #precision #manufacturing #video on making things flat. Like, optically flat: 50nm peak to valley, 1nm RMS. With a “planetary polisher” or “continuous pitch polisher”, which rotates a huge pitch lap underneath a “bruiser plate,” ideally made of something like Zerodur, carrying the blank or blanks. Helpfully explains that the grooves in the pitch lap prevent aquaplaning, just like the grooves in a car tire #tread. In order to avoid having to run his machine continuously, using a many-pole #brushless motor obtained from #hoarding a washing machine, he uses a very high-viscosity pitch (100× more than normal) in a very thin layer, which he initially flattens with a granite plate for 15–20'. His pitch lap is supported on five rollerblade wheels, and he controls motor speed with a VFD. Matching the angular velocity of the lap and the blank results in constant grinding across the surface.
on 02025-12-17turning a GPS/LTE modem into a web server. #hoarding #bootstrapping
on 02025-11-27#tutorial on #hoarding old #cellphones and installing #PostmarketOS to use them as web servers. #CC BY-NC-SA
on 02025-11-25#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 02025-11-11using #CH32V003 #microcontrollers for debugging connections to #ARM #electronics #hardware (alternative to ST-Link or J-Link) obtained by #hoarding disposable vapes. The protocol is CoreSight DAP (Debug Access Probe) over SWD, also implemented by CMSIS-DAP, DAPLink, or free-dap.
on 02025-11-11#video #toread about #circuit-sculpture and #manufacturing wires from raw metal by pulling them through a tungsten carbide drawplate, and twisting square wires, etc., using parts recycled from #hoarding, to make a landscape with trees.
on 02025-06-17Washington Post article from 02019 about marginally literate fugitive child abuser Jeremiah Button’s hidden cabin “bunker”. He went to the landfill daily for #hoarding, but had bought canned food in bulk while out on bail. He had lots of books on mechanical engineering. #homeless #DIY
on 02025-06-14Nina Kalinina on #ghettobotics #electronics #hoarding: “Adventures of a chip scavenger”
on 02025-03-28#video about #Mr-Electron #manufacturing #aluminum-air #batteries with a carbon brush from a motor as the cathode in a potassium hydroxide electrolyte, or some bent-up baling wire. He’s hacksawing the top off a lead-acid battery case from an old motorbike and gets an open-circuit voltage of about 1.6 volts and a short-circuit current that’s initially 20mA with an aluminum-foil anode; when he replaces the carbon-brush cathode with the bent-up baling wire this jumps to 40–80mA. #hoarding #electronics #energy #toread
on 02024-10-18#video of reusing #hoarding old earphones for #electronics #hardware. There’s a continuity-tester Android app, haha! Nice #jugaad with a 2.2kΩ resistor desoldered from a power-supply board, hot glue, and heat-shrink tape. And apparently there’s also a TV remote control Android app called ZaZaRemote by Tiqiaa if you plug infrared LEDs into your microphone port, which the app knows under the name “Smart-ZaZa” or “Audio-IR device”. #bootstrapping
on 02024-09-24#video of a spot welder made with a carbon rod from #hoarding used AA batteries and an 800mA laptop power supply
on 02024-09-23#DIYPerks #video about things you can make from old laptops. Speakers (especially for laptops made around 02008). Heatpipes and cooling fan for cooling high-power LEDs. Diffusion sheets (for lampshades), fresnel lenses, and acrylic back panels (edge-lightable with LED filaments) from the screen. Or use them all together together with the existing backlight to get a lightbox or fake window. Non-smashed screens can be connected to an external driver board to make a monitor (they sell these?). Microphone (he recommends some prefab preamp board with AGC). Hard drive: disc sander for pencil sharpening (just by popping the cover off and gluing on sandpaper), wind chimes from platters, round mirror for analog clock face, laser galvo from the heads’ voice coil actuator (with a laser-pointer diode glued to it instead of using a mirror, you get an “analog VU meter” even with just one axis). 18650s from “older” battery packs (this video is from 02020, so maybe he means before 02010); he suggests sort of manually shapering your way through the plastic case, and using 2.8V as the lower limit for usable batteries, and apparently “single-cell battery-bank cases” are also a thing you can buy. Laptop webcams are usually USB! (Certainly true of this laptop here.) #hoarding #electronics #hardware
on 02024-09-23#Dr-Volt #video about converting an old Logitech mouse into a camera. It had a custom Logitech DIP on a single-sided PCB, separate from the ADNS 2610 camera sensor DIP, which has an 18×18 array of photodiodes visible under a microscope, with an “AGILENT 28D3D” label on the exposed die and a date of “2004”. Since he didn’t have a datasheet for the Logitech microcontroller, he hooked up the sensor chip to an #ESP32 S3 (programmed with #PlatformIO and VSCode) from his collection of #microcontrollers, like the one he’d built a laser scanning microscope from before. The chip uses an SPI-like protocol, but using a bidirectional data pin, and it exposes registers for not just Delta_X and Delta_Y but also some others including Pixel_Data, reads from which provide one pixel after another (so there’s no way to request a particular pixel). The mouse’s native resolution seems like a decent monochrome microscope, but with a very small field of view. He was able to get about a 3fps frame, unsurprising for what’s basically a debugging feature. He grafted the ESP32 into the mouse. #hoarding #electronics #hardware
#video about using an FT232R UART/USB converter chip with USB OTG to get some GPIOs out of an #cellphones. #hoarding #electronics #toread
on 02024-09-23#video #toread about #hoarding windshield wiper motors for #mechanisms
on 02024-09-18#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#video about #hoarding old TVs, specifically a Samsung CW-28D83N CRT unit. He gets two speakers (8Ω 10W), a heatsink from the electron-gun driver, some resistors, electrolytic caps, ceramic caps, film caps, some zeners, etc. He thinks the yoke has “very interesting parts” because magnet wire is “very expensive” and it has a “good chunk of ferrite” and another one. He also likes recycling wires. He’s even excited about the steel wires between the springs that held the CRT in. Okay, the degaussing coil actually is pretty fine magnet wire, though I wouldn’t describe it as having “epthepthional” quality as he does. He also really likes the powerline RFI filter, which is on a separate single-layer board, and he power cable, and the flyback transformer. And the pushbuttons, and the infrared phototransistor, and the PTC overcurrent safety, and more film caps from the main board, an NTC probe, the bridge rectifier, some 7805-family regs, more resistors and electrolytics and inductors, and the big chopper transformer, and the hard-to-find big transistors for driving the deflection yoke. He keeps saying each diode is Zener, which makes me wonder if he just thinks all diodes are Zener diodes, except for a couple of Schottkys; I think he also maybe identified a couple of MOVs as ceramic caps, but maybe I’m just misidentifying ceramic caps as MOVs. He likes the TDA7297 audio amp chip and the heatsinks. Oh, toward the end he identifies an epoxy power rectifier as a diode without saying it’s a Zener, but then he misidentifies the glass signal diode next to it as a Zener, despite being contradicted by the silkscreen. This is kind of borderline; I don’t think this quite deserves a plonk for “electro jungla”, but it’s so not a high-quality video. #electronics #hardware
on 02024-09-10#Cesar #video about #hoarding #cellphones #electronics #hardware
on 02024-09-10#video playlist #toread on easy #electronics experiments; the first recycles an RF modulator from a VHS VCR to modulate a signal from an analog security camera. #hoarding
on 02024-09-01#video #hoarding #toread on separating metals economically
on 02024-06-15#video #toread on repairing ATX power supplies #electronics #hardware #hoarding
on 02024-06-15#video on repairing angle grinders #hoarding
on 02024-06-12#Coy-Beardmore #video on salvaging industrial robot arms. Holy shit, US$80 for a cleanroom #SCARA arm. And then a guy who has a warehouse full of used robot arms gave him another one, plus the power supply and control electronics, for free. So then he spent a bunch of time with a vertical milling machine making solid steel rails to mount the robot arms on. Adept V+ is running in a windowing environment I don’t recognize, on some kind of OS with drive letters. Software dates 01984-01995, supporting TCP/IP, and V+ is apparently from 02000. He had to troubleshoot a short circuit in the wire to the Z-axis home sensor, whose insulation had frayed; it kept blowing a 2-amp fuse when the switch closed. There’s some kind of weird bespoke programming language visible at 4'56". #hoarding #robotics
on 02024-06-08#video on salvaging the mirror #brushless motor from a laser printer. #hoarding by #Zafer-Yildiz. I expect disappointment from watching a video of his previously. Jesus fuck, he’s touching the first-surface mirrors with his fingers. Which are dirty. ALL OF THEM. Good tip on identifying power rails from the polarization of a smoothing cap. By grounding different signal lines on the connector through a 1kΩ resistor he gets it to spin up! But shows no waveforms. He gets it to spin faster by overvolting it (initially 12V from his lab supply.) By feeding in a varying-frequency sine wave on a control pin he also gets different speeds. Not that bad a video for 5 minutes I guess.
on 02024-06-08#video on salvaging a flatbed scanner. #hoarding #toread
on 02024-06-08#TPAI #video on #hoarding high-power junkyard stuff for #jugaad.
Loosely defined; Gerolf’s first “exciting find” is a 35kg transformer with a 200-amp secondary that’s only 5kVA because it’s 50Hz. Seems to be of E-I construction, so it could be a good source of electrical steel, not to mention high-ampacity copper, although his first step is to cut through the 6-kilogram 200-amp secondary with an angle grinder. His objective seems to be to make a kiloamp source for heavy welding, although I’d think a 200-amp secondary would be fine for that. He can’t usefully ohm out the primary because he doesn’t know about Kelvin connections, but he does succeed by measuring the inductances instead. He compares it to a couple of microwave-oven transformers, removing their secondaries and magnetic shunts to replace them with welding cables. 2½ turns on the small MOT can reach 395 amps. The larger MOT (also 2½ turns) reaches 649A. Another transformer he had lying around reaches 666A. 3½ turns on the 5kVA transformer exceeds 1kA, which is the limit of his clamp meter, so he got another one which measured 1200A.
This seems like high current but not high power; an inline-6 Mazda CX-90 is, by contrast, 16.6 horsepower, or 12.3kW, more than twice the rated power of this transformer, and presumably its actual output power is even less when you short-circuit its output through a wrench like this.
He also picked up a handheld spot welder (Dalex-Werke, 380VAC input, 9.2 kg, and various nameplate power ratings I don’t understand including 2.4, 6.1, 10, 2, and 20 kilowatts; I guess 7500 amps is the secondary short-circuit current and should not be multiplied by the nominal 2.3 volt output rating to get 20 kilowatts). He does get it to make some spot welds on razor blades.
He also found a component stereo system (Grundig RT 40 M tuner, Grundig SV 40 M amp, and Dual 1219 turntable) with a fake wooden façade; the tuner capacitor in the radio wasn’t even stuck, and both the radio and the amp from 01967 worked fine! He painted over the ugly fake woodgrain. He had to melt polymerized lubricant off the record player’s speed selection #mechanisms with a heat gun, then scrub it off with WD-40 and steel wool. Also the power switch doesn’t work, and he had to replace the pickup and the center pin. He explains the stroboscopic tachometer at 28'10".
on 02024-05-17disturbing #video of #hoarding poop
on 02024-05-16#TPAI #video on #hoarding junkyard machinery #toread
on 02024-05-15#hoarding #electronics #hardware #video #toread
on 02024-05-10#randomtronic Joule Thief build recycling a common-mode choke. #hoarding #electronics #hardware #toread
on 02024-05-09#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 02024-05-08build a drone engine from an old hard drive #video #hoarding a two-platter 120GB 7200 rpm Seagate Barracuda specifically. By #Zafer-Yildiz. Normally I’d assume the spindle motor was too low-powered to be useful this way, since they consume about a watt in normal operation, and quadcopters usually use several hundred watts per motor. He solders a “Simonk30A” ESC to the spindle motor and attaches the rotor from a computer cooling fan, which was unsurprisingly also a #brushless motor, with a bit of gelling superglue. He supplies the ESC with 12 volts, which is probably what the motor originally used. Even before he adds reflective tape to one of the fan blades, it seems to be poorly balanced and has a lot of vibration, which is probably not what the motor’s precision bearings are optimized for. Apparently he’s driving the fan at 6600–7900rpm. No force measurements, no temperature measurements, no power measurements, nothing. Zafer, I am disappoint.
on 02024-04-0610 uses for a microwave oven transformer: #hardware #hoarding #video by #Murray-Smith. Among other things he demonstrates welding six of them together to get a large motor stator. #toread
on 02024-04-06salvaging old computer crap #hoarding #hardware #video #toread
on 02024-04-05salvaging things from an old computer detailed #electronics dissection of a CD-ROM drive, extracting the head, the plastic gears, the ground dowel rail, the stepper leadscrew, and the brushless spindle. He hooks the spindle up to a power supply and sticks a propeller on it. Without a propeller he gets it up to 16000 rpm according to his laser tachometer. From the computer he also recovers a CPU cooler, the ATX power supply, a piezo buzzer, a power LED, and a floppy drive. He removes the connectors from the power supply but fails to look up what some of the wires are for, although he does somehow look up the use of the “turn on” green wire. Amusingly, his test for the 12-volt line was the same as mine: a car headlamp bulb. He charges a couple of 1.5-volt rechargeable AA cells (1100mAh) with the 3.3 to 5 volt difference, which I guess is pretty safe for Ni-Cd or NiMH cells. But then he inadvisably charges some bare lithium-ion cells with the 5-volt line dropped down to 4.4 volts with a series diode. Then he hooks up a 22-amp 12-volt DC motor to the 12-volt lines with a larger propeller, and then a 24-volt brushless motor (maybe salvaged from a printer) across the ±12V lines. Then he runs a 36-volt ebike motor from the ±12V lines. Then he charges a 12-volt lead-acid battery from the -3.3V and +12V lines with a diode to drop the voltage a bit. From the floppy drive he salvages the #brushless motor but can’t figure out how to use its driver board, so he hooks it up to an external ESC, the same one he used to drive the CD-ROM spindle motor. In order to desolder its windings he turns down his old soldering iron tip on a lathe. (I don’t remember having previously seen someone heatshrink tubing with a soldering iron.) The floppy drive motor goes 6000 rpm at 17V and 14000 rpm at 19V. #hoarding product-shill #video #hardware
on 02024-04-05“Amazing” #hardware Projects From Old Scrap Circuit Boards. Fake, removing components from salvage boards with tweezers without desoldering them. First project is an uncredited, unexplained Joule Thief cellphone charger that produces too-high unregulated output voltage (one commenter said, “When I plugged this into my phone everything blew up.”). Second one is a shitty high-distortion class-A darlington amp for an 8Ω paper cone speaker consisting of two NPN power transistors from a compact fluorescent lightbulb, a 220μF cap, and a 330Ω resistor. Still, he’s doing some cool #ghettobotics stuff with almost no materials or tools. By “Creative Goutam.” #bootstrapping #hoarding #video
on 02024-04-05#video from 02015 by "fullspectrumtechnician3798" on salvaging #microcontrollers for #hardware #electronics projects. Socketed DIPs are easiest to remove from the equipment. Old computer printer boards are one of his examples; he exhibits one with an UV-erasable 8748, which you can also “enable the external access” (I think this is pulling the EA pin high, maybe pin 7) to make it run a program from external ROM/RAM. He also exhibits what looks like a Packard Bell full-length ISA hard drive controller, saying, “normal Winchester drive controllers, pretty much all of them will have either an 8048 or 49 or 8051, usually...labeled, like, Winchester, something like WD1015.” He demonstrates one thus salvaged and hooked up to an external EPROM. Then he exhibits a full-height 5¼ IDE hard drive, saying they usually have an 8051, but this time he’s pointing to something like a PLCC. Then he exhibits an ISA modem card, which he says pretty much always has a microcontroller. He says the Winbond 78C31B on that modem is an 8051 (and therefore also has EA). “Some network cards like this old [ISA] LANTastic have a Zigalog Z80... luckily the serial chip, the RAM, and the CPU are all socketed.” Then he exhibits an old (01980s) UPS control board with a Philips 87C52E socketed DIP, which is another 8051. He says the MC6800 series is also useful even if preprogrammed, by using the “special functions” pins (?) to “tell them to boot off of an external ROM”. Though the one he shows is UV-erasable. Holding up a PLCC chip, he says hard drives, especially Western Digital, use the Intel 80C196 style, which is 16-bit but still has the “external access” pin. And he says keyboards often use the NEC D8048-8C, which is of course an 8048. #bootstrapping #hoarding #video #scouting
on 02024-04-05salvaging motors from floppy disk drives #hardware #bootstrapping #hoarding #video He doesn’t manage to nondestructively disassemble these NEC floppy drives; he suggests making a nut for their leadscrews by twisting some wire, which seems like it ought to work. Rather than trying to use the flat-flex cables, he solders directly to the motor pins. Demonstrates crimping Dupont pins onto the wires he soldered onto the motor. Then he wires them up to a couple of DRV8825 stepper driver chips and an #STM32 Blue Pill. Running them on 9 volts with a 100% duty cycle they got up to 90° (according to his thermocouple) and started to smell, for which he suggests using a different driver board called the “EasyDriver”. He uses Arduino’s LiquidCrystal_I2C.h to talk to his 16×2 LCD.
on 02024-04-05salvaging printers #hoarding #video #toread
on 02024-04-04#LudicScience #video on useful parts from an old printer, a Samsung laser. Kind of clueless. It makes me cringe seeing him poke the first-surface mirror with a screwdriver, and he erroneously claims the mirror-spinning motor is a stepper. #hoarding
on 02024-04-04salvaging printer parts #hoarding #video. No words, by Salvadore Tartaglia; full video on his Italian channel. He disassembles a Brother all-in-one scanner/printer, but doesn’t really explain what the parts are for. There’s an optical encoder wheel on the paper feed and a belt driving the carriage from a DC motor, which I think has an optical encoder tape that isn't shown clearly. He thoughtlessly rips off the optical encoder wheel and discards it, apparently unaware of its significance.
on 02024-04-04#EEVblog photocopier teardown #hardware #hoarding #video #toread
on 02024-04-04making a #ceramics kiln out of an old oven, but he could only get it to 820°. #video #hoarding #toread
on 02024-04-03recycling thrift-store jewelry by melting it down #hoarding #video #toread
on 02024-04-03#Nighthawk 6 uses for a 90% medical oxygen concentrator, mostly fireworks like senko hanabi, but also using steel brake lines for poor thermic lances and an oxypropane torch, and finally a macaroni rocket/thermic lance. #hoarding #bootstrapping
on 02024-04-03DIY vapor-compression #cooling as the first stage in a two-stage cascade cryocooler using 49 grams of propane (R290), initially using a US$80 reciprocating refrigerant compressor off eBay, which he had to add new “ester oil” to. He built his 5.5-meter-long interstage heat exchanger as a coaxial heat exchanger by soldering together copper elbows and other tubing. He recommends silicone caulk rather than teflon taper or plumber’s putty for threaded pressure fittings, but of course most of the connections in the refrigerant circuit are soldered. He immersed the propane-charged apparatus in a bathtub of water to check for leaks, finding one in a pressure gauge. He achieved -32° with his initial reciprocating compressor (ambient temperature a few days later 23.7°), then replaced it with a rotary compressor, which overloaded his homemade condenser coil, so he obtained a better condenser from #hoarding a used air conditioner. This enables him to cool water above freezing at 116 watts (0.83°/minute for 2ℓ), a disappointing CoP of 0.17, probably because he designed his capillary tube for a larger ΔT. #video
on 02024-04-03recycling auto parts #hoarding #bootstrapping. Basically just explaining what a junkyard is with stock junkyard footage. Suggests using the junkyard to practice removing parts from vehicles. Worthless #video but at least it’s short?
on 02024-04-03salvaging parts from old computers. #hoarding #bootstrapping #video disassembles DVD drive, rescues motors, etc. He doesn’t like brushless. Does like the ground rods, the magnets in the laser head, some parts of the power supply (heatsinks, power electronics attached to them (mostly diodes but some power transistors), inductors, and large or weird caps, AC sockets, fans), etc.
on 02024-04-03DIY a laser projector from a hard drive to display messages 30 meters away. #hoarding #bootstrapping #video It looks like he mounted 12 mirrors at different angles around the outside of the platters, then used them to deflect a largish green laser diode, but had a lot of trouble with timing jitter anyway, maybe because he's using optointerruptors to directly generate the timing signal and interrupt his Arduino and the optointerruptors have some jitter, or maybe because he’s doing serial port communications at the same time. His first version using a 5mW red laser diode was not as bright as he wanted and only had 8 lines of vertical resolution, so he upped it to 12 and switched to a 120mW 532nm DPSS green laser from eBay. He suffered a lot from PLA creeping under stress, which kept throwing his mirrors out of alignment. Also DPSS turns out to be bad for rapid modulation, so he switched to a 700mW 520nm laser diode, and he added a bleeder resistor to keep the laser from ever turning all the way off so it would be faster. He doesn’t know the AVR video generation tricks that let you use the SPI interface to pump out 8 million pixels a second, so he’s suffering from only being able to do 1 million.
on 02024-04-03cheap 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#Madman salvaging a washing machine motor for a belt sander, using mostly a MIG welder, a vise, a hand file, a drill (without a drill press, but with a redoubtable selection of holesaws), a hydraulic press, and an angle grinder. As an anvil he has a section of railroad track. It took him a month and a half. #bootstrapping #hoarding #video
on 02024-04-03#EEVblog salvaging parts from #inkjet printers (HP Officejet Pro 8710) to reuse; specifically the power supply (32V at 1095mA or, in sleep mode, 12V at 170mA), four conveniently mounted infrared photosensors, ferrite beads, coin cells, through-hole inductors, a relay, high-voltage suppression caps, a surface-mount pulse transformer for power supply feedback, an LCD screen with flat-flex cable and IR LEDs around it for the IR touchscreen, linear scanning array (CCD?), dc motor with relative optical encoder, linear rod for the carriage, lots of T10 Torx screws, four more dc motors (the head drive motor being a large 20-watt Mabuchi RS-645VA-24135, the third being in the ink sump pump, and the fourth being the paper advance motor with a 600-count optical encoder disc), optical encoder grating tape, speaker, springs. Says there’s nothing of value in the paper tray and that the plastic is nonreusable, so in summary it’s “not worth your time”. #hoarding #bootstrapping #video
on 02024-04-03#TPAI salvaging parts from printers and scanners to reuse. #hoarding #bootstrapping #video very slow paced. From an HP inkjet/scanner combo he salvages a paper cone speaker, a switchmode power supply, the paper feed photointerruptor optical encoder (with a bit of abuse to the transparent plastic disc), the paper feed dc motor, the carriage dc motor (including its wiring harness), the precision ground carriage rails, the carriage drive toothed belt, the photointerruptor tape from the carriage encoder, numerous springs, the sump pump dc motor with its photointerruptor encoder, lots of plastic gears, the paper feed platen axle and another paper feed roller axle, the scanner bed glass, the scanner drive stepper motor, the CCFL power supply, the cold-cathode fluorescent lamp itself, three mirror-glass strips, and the scanner lens. It looks like he was going to make a followup video but never did (this was ten years ago).
on 02024-04-03#TPAI salvaging parts from dishwashers to reuse. The interior is stainless! And he salvages thermal cutouts, water heating elements, a 16-amp 240-volt relay, a capacitor, the power switch, a pressure switch, a shaded-pole induction fan, a 30-watt “extrusion pump” to move water, some smaller relays, a bunch of power electronics (including seven triacs), a rotary switch, an EEPROM, some opamps, some darlington array drivers, a thermistor encapsulated in stainless steel, an electromechanical valve (“Aquastop”), a styrofoam float microswitch, the giant induction-motor-driven dishwasher circulating pump (the single-phase type with a start capacitor), and a Mitsubishi M38027M8 8-bit microcontroller. #hoarding #bootstrapping #video #scouting
on 02024-04-03