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  • RaymondR6 commented on Will Donaldson's instructable Leather Dog Collar19 days ago
    Leather Dog Collar

    For those of us that have long haired breeds (I have a Shih-Tze and a Llasa Apso), I strongly recommend rolling the belt edges together and stitching them to form a rolled or "round" collar. This prevents matting or wear out, and allows the collar to slide around the neck more freely. I buy my rolled collars here: https://www.collarsandmore.com/shop/collars/rolled...This is an extra step but your pet will enjoy wearing th ecoller better than a flat collar.

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  • RaymondR6 commented on jessyratfink's instructable How to Puppy Proof Your Home 4 weeks ago
    How to Puppy Proof Your Home

    I had to do this for my Shih-Tze many years ago. I also recommend getting a cat/kitten collar with a bell attached so when the puppy is hidden, you can find it by the sound. Our Shih-Tze likes to hide under and behind our platform bed, so the bell collar was our best way to know where it was.

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  • Fading LED With Arduino Analog Output in Tinkercad

    As a Electrical Engineer, a computer programmer since January 1972 using FORTRAN on an IBM 1130 minicomputer), a programming instructor since September 1979, and a present Arduino user, I find this "Instructible" interesting, but coding with "TinkerCAD" awkward instead of just coding in "Processing" and using the simple ICE environment. Coding is simple to type and execute instead of using a mouse and moving blocks around. And I can document my ASCII character code easily to teach others, including sending it by SMS if needed, and verbally.

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  • How to Desolder Electronic Components From Circuit Boards - 7 Tips & Tricks | Free Parts for Projects!

    I also use a heat gun purchased through Walmart. It has two settings for temperatures, and it is ideal for removing multiple pin chips, especially SMT. But it is dangerous for plastic bodied part such as sockets and connectors which can soften up, and when you pull these components after heating, the pins stay on the PCB.

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  • RaymondR6 commented on GFire's instructable Anti-Nester™ - (Bird Nesting Deterent)3 months ago
    Anti-Nester™ - (Bird Nesting Deterent)

    Great and simple idea. This uses the protective instinct of being watched by a possible predator. It should work with other birds. It did remind me of the simple defense that Indian men used to prevent tiger attacks. Since tigers prefer to attack when their prey isn't looking, these men use human face masks worn behind their faces or on the back of their heads. This fools the tiger to believe that that man has two faces and eyes on the back so they don't dare attack if that man is looking from behind.

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  • RaymondR6 commented on Mjtrinihobby's instructable Recharging My Car's Lithium Battery. 3 months ago
    Recharging My Car's Lithium Battery.

    The car's alternator main purpose is not for recharging the battery. It is there to supply the electrical power for the car, such as head and tail lights, radio, horn and wipers. Read about the very first autos of the 20th century and see for yourself. The battery was designed to power the engine starter only, yet now it has evolved to power other items, and the alternator can recharge it later. Some hybrids don't have any 12 V DC battery anymore, taking power from the high voltage traction battery and using the smaller electric motor as a "starter" and "generator". These have a DC-DC step-down converter to power the electronics and accessories.But most other hybrids do use a smaller 12 V DC battery to power the system that controls the HV battery.

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  • RaymondR6 commented on kenmacken's instructable Full Size RC Car4 months ago
    Full Size RC Car

    Where is your "drive-by-wire" tutorial?

    I admire your building experience since I also had a dream for a car that can be driven remotely or by itself. I have experience in automotive repairs, and I understand why several levels and cable controls have spring returns (such as the accelerator, brake, and engine emission controls) because they need a neutral or rest condition when the controls are not in use. But if you are modifying the systems for electric control with solenoids and motors, I suggest modifying those spring returns for lower tensions and save on power consumption.

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  • RaymondR6 commented on NikonUser's instructable Ultrasonic Rainwater Tank Capacity Meter4 months ago
    Ultrasonic Rainwater Tank Capacity Meter

    To warn of a possible overflow, just install a level switch with a ping pong ball as a float near the level you wish to warn, and add that switch as a new input to the Arduino.

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  • RaymondR6 commented on macgeek's instructable Alexa Controlled Toilet5 months ago
    Alexa Controlled Toilet

    I agree about the "laziness" for normal humans, but there are many physically limited or handicapped seniors (my mother-in-law who is 90 years old) who have little strength to press the mechanical level. Maybe just the push button to activate the flush will be enough for her, but there is a real need for voice controlled automation in the world for others. So I applaud and recommend this "Instructable".

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  • RaymondR6 commented on 陳亮's instructable Print Your Own Moon5 months ago
    Print Your Own Moon

    That project looks great but most of us are limited in resources to build it. Are you planning to produce them in quantity for sale? I would be interested in buying one.

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  • RaymondR6 commented on androkavo's instructable SMD - Hand Soldering5 months ago
    SMD - Hand Soldering

    This is well done and will work for repairing broken off MicroUSB sockets on PCBs. Some soldering tips can be machined or filed to produce that tiny tip. I also recommend using silver based solder as it will conduct better for tiny conductors but needs a hotter temperature to melt.

    You can add some liquid flux to the chip underside then press and align it on the PCB. The flux will dry and hold the chip in place while soldering. It is cheaper and probably safer then glues.

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  • Share WiFi With Ethernet Port on a Raspberry Pi

    I have worked with Ethernet (beginning at 10 MPS) since the early 1990's and I know how to use a WiFi router, but this interface is brand new and well designed, even for an experienced engineer such as myself. I like your simplicity to the build and I recommend anyone to fully investigate the Ethernet equipped device and see if it has a fixed IP address. then setup the IP range to cover that address only (or a very small range for more devices). WiFi is becoming better each year and soon we will have vehicles using a special WiFi version for V2V communications.

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  • RaymondR6 commented on Karlstrom's instructable Arduino Apple Watch6 months ago
    Arduino Apple Watch

    This should work for Android smartphones, too. Samsung and Motorola made the first smart watches that paired for smartphones and some do work with Apple iPhones, too.

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  • RaymondR6 commented on DIY KING 00's instructable DIY Bladeless Fan From Scratch6 months ago
    DIY Bladeless Fan From Scratch

    This is a well explained "instructable". As an engineer, I knew how the Dyson fans work, but this is the first project that I see which actually builds the same fan effect for a much lower cost.Dyson has great designers well trained in aerodynamics, and this fan is one of many of their products.Yet it is simple to understand.

    No. the pulse modulation will not shorten the life of the motor, There are millions of pulse modulated devices, including all the switching power supplies used in computers (as developed by IBM for their Thinkpad laptops in the 1990s) that many homes have. Good filtering will remove the high frequency noise and produce excellent fixed or variable DC power.

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  • RaymondR6 commented on geotek's instructable Harvesting Electronic Components6 months ago
    Harvesting Electronic Components

    I use several methods but the heat gun is the most effective for SMT and most pin-soldered devices. I heat the part until the solder begins to change color then rap the board on a hard surface. The heat gun I bought was at Walmart which used 120 VAC and has two settings. Since the gun only heats up while pressing the trigger, it is safer than a soldering iron or propane torch, and faster than a soldering gun. Most have a shield to prevent touching it to anything that can burn so it isn't a fire hazard unless it is improperly used. The trigger may tire your finger but I do recommend taking a break every ten minutes or less.

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  • Automated Staircase LED RGB Lights for $20?

    I like your project, but living in a two story home should never be that troublesome to be "falling down the stairs at night with a full bladder". You should have a toilet on every floor. I live in a two-story home and I have two full bathrooms on the second floor. The door of one is less than three feet from my bed. But I do like the LED lights when I need to visit the kitchen at night!

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  • How to Make a Touch Switch Using One Mosfet

    i did give him constructive recommendations: "at least use hand tools and a pencil to draw one on paper then scan it in".The diagram he posted is "terrible" and that is not an opinion. Other posted comments agree with me. Compare how others who have posted "Instructables" have done a better and even professional diagram with component identifications and value. He didn't do such steps correctly. I was a instructor and teacher for ten years in a technical institution, and all my students can draw better than that. As for computer drawing tools, there is "Paint" which is free in Windows.

    I designed and built my first touch switch in 1974 as my EE project. FETs existed but MOSFETs didn't, so I used some TTL circuits to produce a clock signal that was transferred by my touch though a metal plate to the input of a J-K flip flop which triggered a NPN transistor and a incandescent bulb (only red LEDs existed but were pricey). I got an "A"!! Later I built one using a UJT clock (look it up) and an SCR for the load, and a third using a TRIAC for an AC load. BTW, your schematic diagram is terrible! If you don't know how to use computer drafting or drawing programs, at least use hand tools and a pencil to draw one on paper then scan it in.

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  • Add Wireless Charging to Any Phone: Using the LG-V20 As Example

    For all those who need a better way to charge without having to open their smartphones at all, or risk damaging their charge ports, I recommend the "Volta" magnetic charge cables and connectors: https://voltacharger.com/I have all my tablets, two Chromebooks, and my Samsung phone with them. The magnets are super-strong! I can pick up my phones or smaller tablets by the cord and it will not drop. The magnets also guide themselves to the connectors so I can attach the cables in the dark. The cable head also have a tiny LED to help you see them in low lighting and prove that the cable has power. There are many magnetic cable makers (I bought other brands), but the Voltas are the best.

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  • Add Wireless Charging to Any Phone: Using the LG-V20 As Example

    It is very difficult to replace a micro USB charge port because I have done this to several tablets (which are bigger and easier to work with). Now I am using a micro USB connector and removable magnetic cable (Volta) on them because they are too big for wireless charging. No more soldering needed!

    I like the project but many newer smartphones have sealed backs and will not "qualify". Use older models with removable backs and cells (what is commonly described as a "battery" is just one Li-Ion cell). In my case, all of my phones are Samsung Galaxy models, which had "Qi" wireless charging since the S4 model (the latest is the S8), and was one of the very first to use that "Qi" standard. So if your smartphone doesn't have the wireless charging feature, and has a sealed back, swap it for one that does have it (such as a Samsung), or use an older model that allows such modifications.If you want to protect the micro USB charge port from damage (and not do such modifications), buy a set of micro USB connector and cable with a magnetic attachment. T...

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    I like the project but many newer smartphones have sealed backs and will not "qualify". Use older models with removable backs and cells (what is commonly described as a "battery" is just one Li-Ion cell). In my case, all of my phones are Samsung Galaxy models, which had "Qi" wireless charging since the S4 model (the latest is the S8), and was one of the very first to use that "Qi" standard. So if your smartphone doesn't have the wireless charging feature, and has a sealed back, swap it for one that does have it (such as a Samsung), or use an older model that allows such modifications.If you want to protect the micro USB charge port from damage (and not do such modifications), buy a set of micro USB connector and cable with a magnetic attachment. The connector stays inside the micro USB slot, and the cable attaches easily with a magnet. All of my tablets have this. I recommend Volta which sells cables and connectors for micro USB, USB type "C", and Lightning II.

    The wired USB charger will operate better. But don't do both anyway. It is a waste of energy. You can add a transmitter base to your car, mounted on a space of the center console so you can just lay your phone down for wireless charging. I added this to my 2009 Chevy Equinox for my Samsung Galaxy S4, well before any can manufacturer decided to add this as a sales option or standard feature.

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  • The Most Useless Machine EVER!

    This is a nice construction project, but the idea is decades old. And a plain box is not going to attract many to operate it. A better idea is the coin operated bank that is similar and allows one to make money from innocent participants. My favorite (I have one) is the Godzilla coin bank: At least add some decoration, and use a doll hand (or a monster figure paw) to move the switch.

    Then build it (have the inserted or laid coin bridge the switch contacts) and let it make money for your next Instructable project.

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  • RaymondR6 commented on bekathwia's instructable Solar USB Charger8 months ago
    Solar USB Charger

    The Li-ion cell has a voltage range between 2.9 V and 4.2 V, so if the four cells fall between this range, they may be good. I suggest asking someone to charge then and discharge through a simple load to prove that each cell is able to work for this project. BTW, a "battery" is a group of cells in series or parallel (Ben Franklin created that term). The only common portable power device that is a true "battery" is the 9 VDC battery which has six 1.5 V cells in series.

    Yes, you can use this setup to charge two or three cells in parallel, as long as all have equal characteristics. The charge time is multiplied by the number of cells, so two cells takes up twice the time, and so forth.

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  • RaymondR6 commented on kabira's instructable Make a Rain Proof Portable Generator Housing10 months ago
    Make a Rain Proof Portable Generator Housing

    Wood will only transmit strong engine noise if the material is in direct contact with the engine. Isolating the box from the frame with rubber will help.

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  • How to Quickly Chill a Drink in 2 Minutes

    If the ice comes from a freezer that is much colder than 32 degrees F (0 C), then the ice water and salt can actually freeze the contents of the cans. Very cold brine is what wine makers use to freeze the top part of the bottles which forms ice, allowing the removal of the original corks during fermentation, and replacing them with the newer corks or plastic stoppers for retail sales.

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  • RaymondR6 commented on bennelson's instructable Build Your Own Electric Car!1 year ago
    Build Your Own Electric Car!

    @hesym: If you want a "production Electric car", search for used EVs, such as the Chevy Spark Ev and the Nissan Leaf, on the web. Some may be found for less than $10,000, and still give you up to 40 miles of range or more.

    @TheZealousUnicorn: According to my read, the motor was running originally at 12 VDC. The author uprated it to run at 72 VDC. More voltage increases speed, and most motors can run at much higher voltages. Only the wire insulation will limit the maximum voltage.

    Electric motors have high torque but lose HP as the speed increases, so all electric sportscars need a single gear transmission to reach higher speeds. Read all you can about the Tesla Motors Roadster and the newer Model S (P90D) which has two sets of an electric motor through a single gear transmission each for all wheel drive, yet this EV can out accelerate all and every gas engine sportscar that cost more. There are many YouTube videos proving how fast the Model S is in "lucridous" mode!

    @toby que: Electric motors have high torque but lose HP as the speed increases, so all electric cars need a single gear transmission to reach higher speeds. But only two speeds may be all that is needed for most city driving. "reverse" is done by switching (inverting) the polarity of the electroc motor to back up.

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  • RaymondR6 commented on More Cowbell's instructable Easy Generator to Home Hook Up1 year ago
    Easy Generator to Home Hook Up

    If your main panel box doesn't have a central main breaker, then you have to spend more money to install and use a transfer switch. My installation is similar (see my post above). I did install a transfer switch, and it is working for over 21 years.

    Don't use such a switch. Buy a transfer switch certified and rated for the purpose. Home Depot still sells the same item I bought (see my post above) for $53 now. The store SKU is #100065.

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  • Salvaging Rechargeables for Projects

    All good advice, but I have revived a few 18650 cells by tapping the ends with a higher DC voltage. I use a 9 VDC 0.3A (300 mA) supply, and I tap the ends several times then measure. If the reading is over 2 VDC, then I can use a standard Li-ion charger overnight and see if it hold the charge the next day Of six Panasonic cells that I recovered from an IBM ThiinkPad 600 laptop battery, four were revived.

    As an additional note, there may not be any known recycling center near your home, but you may ask battery sellers. I have one nearby (Batteries Plus) that will take in any type, rechargeable or disposable, and handle them for recycling. I give them all the lead-acid batteries from my UPS equipment, too.

    I have done "tapping" or jolting many times and not a single cell has even warmed up. Today I just did it twice! The current is too low to cause damage and the supply may warm up if the cell is shorted. But most bad cells are open and will not charge from a dedicated 4.2 VDC regulated supply (you can measure the current), so a "jolt" can kickstart the cell revival.I began this "tapping" on NiCad cells using a 15 VDC, 30 A battery charger. That generated many sparks but never an "explosion" or even a warm up. So 9 VDC is low enough to avoid damage and yet enough to "jolt" the cell.

    A third note: many smartphone use flat Li-ion cells that have a protection circuit in them. The top plastic cap may have three or more contacts where only two are for power and the others are for temperature sensors to detect heat These also have overvoltage and overcurrent protection chips inside, so there are tiny FET switches and a fuse in that circuit. If you measure zero volts, then the fuse or a FET is open. The cell cannot be reused in a smartphone.But if you are willing to experiment and take a risk, then remove the packing and the plastic caps. The protection circuit is on the negative electrode of the cell and the metal body is the positive. There is a small metal strap electrode that carries that side to the circuit. Removing the cap and disconnecting the electrodes from th...

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    A third note: many smartphone use flat Li-ion cells that have a protection circuit in them. The top plastic cap may have three or more contacts where only two are for power and the others are for temperature sensors to detect heat These also have overvoltage and overcurrent protection chips inside, so there are tiny FET switches and a fuse in that circuit. If you measure zero volts, then the fuse or a FET is open. The cell cannot be reused in a smartphone.But if you are willing to experiment and take a risk, then remove the packing and the plastic caps. The protection circuit is on the negative electrode of the cell and the metal body is the positive. There is a small metal strap electrode that carries that side to the circuit. Removing the cap and disconnecting the electrodes from the circuit allow you to measure the cell directly (be careful as the entire metal body is the positive!). If it has a voltage, then use alligator clips to charge and remeasure. If it does hold a good charge, you may find a use for this cell later. But if nothing happens, just have it recycled.

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  • RaymondR6 commented on Roddy Scott's instructable The Tesla Meets Edison Nixie Clock1 year ago
    The Tesla Meets Edison Nixie Clock

    AC is more efficient to move power than DC because in a direct current circuit, the electrons move from atom to atom in the conductor, while in an alternate current circuit, the power is moved as waves due to the vibrations (60 Hertz). Higher frequencies can move even more energy (that is how cellular phone service works). This is how tidal waves can move so much power across lakes and oceans. Tesla was trying to move free energy using large transmitting towers but failed. Yet even now we move our data across high frequency waves (Bluetooth, Wi-Fi , FM , TV, and cellular) thanks to Nikola Tesla's inventions.

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  • RaymondR6 commented on jeff-o's instructable GroundFX Bed1 year ago
    GroundFX Bed

    I have a king-sized bed made in 1989 that is similar, but uses mirrors and fluorescent lamps. The mirrors reflect the floor and covers the normal platform side walls. The lamps have two 2-way switches so any side can turn them on or off. I have replaced the fluorescent lamps with LEDs but it still works as a "floating bed".

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  • RaymondR6 commented on dave5201's instructable How to Hide a Wall Wart Transformer1 year ago
    How to Hide a Wall Wart Transformer

    No, you cannot use the phone company's power to charge your devices. It is limited to several milliamps (mA) and they can measure that consumption, indicating an "off-hook" condition as if you were activating a phone. And if the limit is exceeded, they can do a "disconnect" and you are left without phone service. Don't tryit unless you wish to pay for a line reconnection at the CO (Central Office). If you wish to know more, you can ask the phone company or just search the Web.

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  • RaymondR6 commented on dave5201's instructable How To Hide a Wall Wart Transformer1 year ago
    How To Hide a Wall Wart Transformer

    I do for over 40 years! The phone company supplies 48 VDC battery power with its own UPS and generators. So if there is a general power failure, your home phone will still operate, but your cellphone may not! Besides, without power, how can you keep your cellphone charged?

    Eye protection is always needed when you handle wire, because a strand can break loose and fall into your eye. And if you have ever cut solid wire, the force can eject a piece of wire into your eye!. I use prescription glasses so I am indirectly protected. But whenever you manually handle wire, solid or stranded, put on safety glasses or goggles, and save your eyes.

    I see what was done here. The "wart" isn't "gone", but just mounted where it would be unseen. Having both the 120 VAC and the transformer output (lower AC voltage) in the same pipe for a short distance isn't a fire hazard and I see it acceptable. I would go even better by opening the "wart", removing the plug inside, wiring the 120 VAC line directly to the transformer wires, close up the "wart" body, then hide the "wart" inside the outlet box, and put a blank cover on it.

    The primary reason that the electrical code exist was to prevent fires. The first NEC (National Electric Code) was written by the Fire Deprtament of New York City over a hundered years ago. And if your home ever gets burned, and the fire instectors detects that a bad electrical connection, not done by the code, was the cause, your fire insurance will not pay!!

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  • RaymondR6 commented on Nikus's instructable 555 Useless Machine1 year ago
    555 Useless Machine

    I suggest covering the plastic tip with the cutoff finger of a glove so it does look like a human finger is pushing the switch off.

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  • How to Surface Mount Solder Using Solder Paste

    This is a very useful guide, but why "a hot hair tool"? Even if it were a "hair dryer" the temperature will never reach the melting point of solder.

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  • RaymondR6 commented on botronics's instructable Convert 3-AAA Flashlite to Lithium1 year ago
    Convert 3-AAA Flashlite to Lithium

    I have a special charger that holds two 18650 cells and has built-in protection, so I don't need the protective circuit.

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  • RaymondR6 commented on andrewwilson's instructable Emergency Stop Button 1 year ago
    Emergency Stop Button

    Great idea using the NO to short the load current. I would also recommend use a "push off, push on" switch that mechanically toggles and keeps the switch in the pushed position, so you can let go and it will still stay off.

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  • DIY: Squeeze Extra Capacity From Old NiCd Batteries

    Each unit is a "cell" ,and the "battery" is the whole group (I wonder what fool started the single "battey" mistake years ago). Each cell can be measured individually between its two electrodes without disconnecting it. That is how the author finds which cell has to be removed and substituted with a better cell from a donor battery.

    I have revived bad NiCad cells from the "shorted" malady or ailment by striking (hitting) the electrodes with the contacts of a car battery charger (uses rectified and unfiltered 12 volts) for a few times. Sparks fly because of the internal short, but that fuses open the short and revives the cell.

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  • RaymondR6 commented on tanner_tech's instructable Custom Tube Guitar Amp1 year ago
    Custom Tube Guitar Amp

    I aghree. The hand drawn schematic is very hard to read. If you can't use a professional drawing program, ask someone who has excellent drawing skills to do it for you. And I ask if you wired the twin heater filaments of the 12AX7 in parallel with the heater filament of the 6V6.

    The original equipment has their vacuum tubes exposed to release the heat. Only certain equipment needed metal shields over the vacuum tubes to isolate the internal tube elements from stray magnetic fields or radio signals.

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  • 1$ Wireless Speaker That Connect's in 0.0000000001 Seconds !

    Marconi invented the wiremless transmission of noise (from a spark generator) and the first use was wireless telegraphy. The first tuned (frequency stable) wireless transmission for audio, which is what we call "radio" was invented by Nikola Tesla. Tesla even had to sue Marconi for the "radio" invention.

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  • RaymondR6 commented on AUGUSTO VJ's instructable EMERGENCY PHONE CHARGING HACK1 year ago
    EMERGENCY PHONE CHARGING HACK

    The car charger has a switching voltage regulator inside that can handle DC from 6 to 30 V, so even two AA, C, or D cells in series can charge your smartphone. And if the voltage is too high, don't worry! A regular car can generate up to 16 V, which the same charger can handle, too..

    The car charger has a switching voltage regulator that can handle a wide range from 6 to 30 Volts, so any external source of DC power 6 volts or higher can power it and charge your smartphone. And for the high voltage question, a regular car can generate only up to 16 V, so the car charger can handle that, too.

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  • RaymondR6 commented on Srpska Nauka's instructable How to make a Joule Thief1 year ago
    How to make a Joule Thief

    The 2,5V of the LED isn't any "internal resistance". It is the junction voltage that all semiconductor diodes have to pass and allow the current to cross the PN junction (the joint where the "P" and "N" semiconductors meet), and it varies according to the elements and doping used to create the semiconductor itself. This is why a germanium diode conducts at only 0.47 VDC and silicon diode conduct at 0.68 VDC. Light Emitting Diodes use different elements and doping for each color, so its PN junction can be as low as 1.7 VDC and as high as 4.5 VDC.

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  • RaymondR6 commented on balsuryana's instructable DIY Smartphone Notification Lamp1 year ago
    DIY Smartphone Notification Lamp

    I wish to correct the author:"Old audio jacks (Use 3.5 mm jack)"That is the wrong item or description. The correct item is a plug since the jack is already in the smartphone. I recommend correcting this error soon because I may be the first of many comments about this error.

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  • RaymondR6 commented on deytech's instructable Floating Bed With LED Lights1 year ago
    Floating Bed With LED Lights

    I built a platform bed in 1984 and added glass mirrors along the bottom panels that reflect the floor up to the viewer, making the bed really look like it was "floating" and had no legs. Then I added 4-foot fluorscent lamps under the overhang (invisible to the viewer), and improved the "floating" image. Now I have replaced those lamps with LEDs and keeping the image of the "floating bed".

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  • RaymondR6 commented on GreatScottLab's instructable DIY Portable Mini Monitor1 year ago
    DIY Portable Mini Monitor

    Great project, but it uses a prefabricated LCD and video board. I believe many wish for a cheaper project using a LCD and electronics from an existing device (smartphone, tablet, etc). I see the external interfacing as the main problem, but it can be done.

    Yes, that size is okay. I see a 5-inch screen as the practical limit for a small handheld monitor, unless the font size can be increased. I have seen a small 2-inch LCD but only had a 4x16 font size for text. The smallest monitor could be a wearable one-inch LCD with an eyepiece to see a virtual screen as big as 12 inches floating ahead. That would be a great project, too!

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  • RaymondR6 commented on Créative-Mélina's instructable How to Make Led Shoes 1 year ago
    How to Make Led Shoes

    I could recommend adding a microswitch to the sole/heel from the inside. Cut a slot inside under the clothcover to fit the switch. Wire it up in series to the battery supply wires. Then when the wearer steps down,the LEDs light up. It saves power if the wearer is sitting or standing on the foot edge.

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  • RaymondR6 commented on leomiranda's instructable Variable Bench Power Supply1 year ago
    Variable Bench Power Supply

    I believe the comment comes from someone who has 230 VAC as their "mains' voltages, not just 120 VAC and "neutral" as we have. So this application may leave one live wire on the supply as the SPST toggle switch just opens one line. For better safety and prevent any voltage on any supply line, use a DPDT toggle switch to open and control both lines, leave the unused switch contacts open, and insulated the switch in a plastic enclosure. Adding the "ground" or "earth" is a good safety option.

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  • How to salvage a DVD Drive For Free Parts

    According to the CD players that I have taken apart (similar to the DVD player), there is a five-sensor photodiode that reads the reflected laser light. One is the main data reader, and the other four are arranged around the main reader to confirm and keep the laser pointed inside the track, If one or two of the sensors misses the signal, then the MPU will step the head motor to recenter the track and keep reading. I have watched a CD player operation and you can see the head being stepped as the CD is played.

    It should be "Needle Nose Plier", not "neddle nose Piler". I suggest to all project posters to run your text through a spellchecker before posting the final Instructable. Other that that, you can ask a friend or senior to read the text before posting.

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  • RaymondR6 commented on Lucas Reed's instructable Build Your Own Battery Power Supply 2 years ago
    Build Your Own Battery Power Supply

    Most laptops can use low DC voltages, and don't need a regulator since they have one built in. So just put two 12 VDC batteries in series ans pass that through the DC input.As for the weedwacker, you may be surprised that its motor works on DC already! They have a diode bridge to rectify the AC going in to 160 VDC average, so you can either string several 12 VDC batteries in series, use a 12 VDC to 120 VAC inverter, or make a 160 VDC boost supply (the weedwacker need no regulation).

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