LEDs off house current?

I have recently conceived a desire to pimp out small household appliances, like say a hand mixer. I want to add LED running lights around the joint where the top part of the case and the bottom part fit together. Of course, I also want to still be able to use the mixer for its intended purpose, so I can't just slap a wall wart on the cord. Does anyone have any hints on a safe way to divert/convert about 12v of DC power from the 120v AC power cord? Ideally, I'd like a compact solution, one that will fit inside the case of the appliance.

Posted by TeratoMarty 11 years ago

5 5mw lasers powered by one 120V outlet

Any comments or advice on making this happen? Im looking at buying five of these....http://z-bolt.com/MODR-red-laser-module.htmland hooking them upto a wall transformer off of a 120V outlet.

Posted by mnc615 9 years ago

Help ::: 120v Portable Power Supliy

Im working on a self propeld wooden boat for my 3 yr old daughter i have a moter i pulled out of a standerd stand up house fan.  but it a 120v power requirment.  i've thought solar power but im at my breaking point i dont want to go and spend 150 dollars on a car portable air compresser a/c component help please.  Ps please forgive my horrable spelling

Posted by lyricalfate 7 years ago

Instructables prize power question

Hi! So I have this burning question. If I were ever to win a big prize in Instructables contest that included an power appliance, what should I do if it only works in US? Because here in Europe, we have 230V 50Hz power and you guys over there have 120V 60Hz power. Some time ago, my girlfriend won  a vacuum sealer and the thing is just sitting in its box because we can not use it. The only solution would be a separate converter which costs a lot. And for the bigger stuff it would cost even more! My Worx Semi-Automatic screwdriver works just fine over here (110-230V) My suggestion for the Instructables personnel is that with growing numbers of creators overseas, the prize power problem should somehow be handled (if it is even possible) Cheers, Andreas (happy instructables member :)

Posted by CraftAndu 2 years ago

diy 110v AC screw-in LED lightbulb?

I'm sort of an electronics newbie, but I'm wondering if anyone knows of any designs to make a 110v AC LED screw-in bulb? It seems all you would need is a full wave bridge rectifier, a resistor(?) to lower the voltage, some LEDs, and some variation on a screw-in base to make a home-made LED bulb. Am I wrong, or shouldn't that be relatively simple to build? Any thoughts? Thanks, Matt

Posted by matthew6 11 years ago

convert 240V 50Hz to 120V 60Hz

Recently I bought a Blender imported from US(to India) which runs on 120V 60Hz. I need a converter which Converts 240V 50Hz to 120V 60Hz. I got an idea of using a rectifier-inverter circuit such that by varying the gate signal can accomplish the aim. Is this idea a possible one?

Posted by ravic88 1 year ago

120v AC DC USB Charger

Hello, Can anyone help me with the steps and components of a USB charger?  I am trying to understand how 120V AC is converted to DC for a USB charger.  I have researched this thoroughly but the more research I do the more confused I become. Thank you all!

Posted by webbkevinm 2 years ago

120v FM radio question

Does anyone have any clue on how to build a normal radio that I can plug into my 120v wall jack and not have to use a earplug to listen? I would greatly appreciate it because i have always wanted to design and build my own radio but after scouring the internet i haven't come upon ANY knowledge...not even a manual. Please, anyone?

Posted by commercial free 11 years ago

120V LED Under Cabinet Lighting

Hello everyone. I recently purchased a new home, of which has some nice Under cabinet lighting. But they are extremely hot when I use them. Heat = wasted energy right? I want to be as Green as possible in my new home. The problem is, the Bulbs are these weird straight 120V Bulbs from Westek.http://www.servicelighting.com/Westek-00862-LB25B-25W-120V-HALOGEN-Double-Ended-Halogen-Incandescent-Light-BulbSo, the question is, Can I some how make an LED replacement Bulb? Each housing has 2 of these bulbs, and I have 4 of the housings. I can't read schematics, but any info would rock. Thanks everyone.

Posted by Leejin 9 years ago

Battery powered 120V light bulb

I'm trying to build a steam-punk costume and wanted to use a motorcycle battery to power several edison squirrel cage style bulbs. Fortunately these blubs look better if they are dimmed, but what I'm having a problem with is a schematic and what type of transformer to use.

Posted by Deepeyes 7 years ago

Circuit Diagram for LED bulb running on 120V AC

I have been watching a lot of YouTube videos of building your own LED bulb using a scrap CFL bulb. Since I have watched a lot of those videos, I want to build one. However, almost all of those videos are about making one that runs on 240V AC, and where I live I use 120V AC. Take this video for an example: I also noticed that in that circuit diagram, there is a 5th diode that is unnecessary. So I want to build an LED bulb similar to that one in the video above. But I am not so good with electricity, so I am not so sure how I can modify the circuit so that it will run with 120V AC instead of 240V. Can someone help me with this?

Posted by ADRIANT28 1 year ago

120v thermostats: need help building or sourcing

I'm planning to build an incubator, and I need something to help regulate the temperature.   I've found some in-line thermostats online, but if I had a parts list, I could easily wire something myself.  Does anyone have any knowledge or experience they can share with me?  Thanks!

Posted by awascholl 5 years ago

Customize product that uses 4 - 6 watts 120V AC to run on DC

I have surfed this site for a LONG time now and have never posted a question so this is my first...!!! I have a product that I am trying to customize a little but i need some help.,.. The product uses 4 - 6 watts at 120V AC and it plugs into a regular polarized plug... I am trying to make it run on 12V DC but I really don't understand how to do this or the conversions involved.... I have build a 12V 1A circuit but how can i safely make this product use this circuit...??? If it can run on DC power how many Amps will it use...??? Thanks for any replies and I am really looking forward to making this work if at all possible...!!!

Posted by SummitSeeker 7 years ago

Help with charging capacitors

How do I charge my 450v capacitors with a 120v outlet? I am building a rail gun and need to get these up to a high enough voltage. 

Posted by gclark0812 1 year ago

Need help changing an AC circuits frequency

Alright, so I have a question about an alternating current circuit I was working on.  The wall outlets I'm drawing power from are AC at 120V, and 60 Hz, but I need it to be 120V at between 60 Hz and 1000 Hz.  A variable system would be nice, but I'm not picky.  How would I do this?  Is my only option to convert the power to DC, and then run it through an inverter?  I would like to be able to do this with a small circuit I could build, something that would fit in a project box.  Any ideas?

Posted by Avren5 7 years ago

Making a dry sauna heater with parts from a 120v hot plate

I have a small closed in shower (31" X 31") and have sealed the 6" opening over the door. It makes for a great steam room. However, I love very hot dry saunas. I have been wondering if I could make a small heater placed in the corner with one or more single burner hot plates and stones. I am wondering if this could be done safely if the AC lines are totally protected. I could easily turn of the power when showering. I welcome any feedback.

Posted by hywmiles 10 years ago

12v to 120v sine inverter boosting

I have a 20 year old van. The a/c leaked and it is much cheaper to buy a 120v window unit ($140 with a 3-year walk-in exchange warranty) than to pay a shop to rebuilt the vehicle a/c. I chose a 5k BTU window unit that uses 4.1 amps running, and have a 1k watt sine wave inverter. Alone, the inverter will not start the a/c unit, but will power the fan. I confirmed a trick to start motors with an inverter. I connected an 8" bench grinder to the inverter and started it. It took a few restarts to get it up to speed. Then I started the a/c and it ran without problems. The bench grinder motor was able to supply the reactive power the a/c compressor needed to start. Both continued to run without straining the van's alternator. BUT, I don't want to travel with a running bench grinder going, that's not safe. Is there another way to supply the reactive boost that is safe to travel with? Once I get a simple stable way to run the a/c I'll work on a mount to vent the hot side. The van has sliding windows.

Posted by DavidN71 3 years ago


Hi A while ago i read about electorvibration to create tactile feedback on a conductive surface. It sounds very interesting and i'd like to experiment with it.  After some reading (http://www.disneyresearch.com/wp-content/uploads/teslatouchuist2010.pdf) I found that all you basically have to do is send a sinusoidal wave through a conductive surface. This can be and amplified DC signal. In the paper they talk about a Vpp (peak to peak voltage) of 120V at a current of 0.5mA and a 80- 400hz. frequency. My question is: How to amplify a generated sinusoidal signal (0-5V, 80-400 hz.) to a signal of 0 -120V and limit the current to 0.5 mA so i can use it for some experimentation? Cheers, R.

Posted by ruben_vleuten 5 years ago

how do I energize AC Christmas light with DC power?

I have a set of 50 Christmas lights on a circuit.  120V /  0.17amps.  What can I make to power up this string of lights?  I need to make it mobile so an inverter is out of the question. Thanks, Dewdropin

Posted by dewdropin 7 years ago

IMAGES UNSEEN until clicked on is UNACcEPTABLE !!!

IMAGES UNSEEN until clicked on is UNACCEPTABLE !!! My answers are unseen only to be viewed when clicked. Are others also  being victimized thusly ! https://www.instructables.com/answers/I-have-an-older-General-Electric-120v-DC-motor-tha/

Posted by iceng 3 years ago

Sound-reactive lights! Help!

I want to take a 4 sets of Christmas lights and make them react to music, how would i do this?i want something like this but with Hi-Power AC 120V i have a couple complimentary high power transistors laying around,how would i go about building it?

Posted by Sandisk1duo 9 years ago

Wireless doorbell + ipod = awesome

I have a wireless doorbell kit (plugs in to a 120v outlet) from Home Depot and an old 4th gen ipod (ipod photo).  Does anyone have any ideas how to wire these two items together so it they could play custom noises when the button is pressed?

Posted by ayhindot 7 years ago

Wall outlet current draw

I have built a transformer, that will take 120v, and step it down to 2.5v. I used all the right parts, and the correct rated wire for this. My only issue, is that when i connect the primary coil, to a call outlet, at 120v, it draws more current then my 5A fuse can handle, and the power goes out in my home. I need to get 1.5 amps, @120v going through my primary coil, in order to get the desired output on the secondary. I was wondering, how things "draw" current from the wall, as well as if i where to use a resistor, wouldn't it still draw too much amperage, and just dissipate it in heat, to give the desired output (i cannot use, because it draws more than 5 amps). i could not find a resistor out their, that could handle over 100 watts, so i was also wondering how things like vacuum cleaners only draw a small amount of current. Would i need some sort of current regulator (if that's even a thing)? if you had a light-bulb, and a battery, would the circuit the light-bulb is attached to drain less current, if their was a resistor, and thus having the battery last longer, or would it draw the same amount, and just dissipate energy through the resistor in the form of heat, to give the light-bulb its self less current?

Posted by merlinj 2 years ago

Ohm's law?

So, i have a broken soldering iron, and i want to fix itcan someone =smart= calculate the required resistance of wire at 120v aci don't care about the amperage, as long as its under 2 ampsplease give me a range of resistance, i don't like to trip fuses, (my parents hate that!)

Posted by Sandisk1duo 10 years ago

Traffic signal input voltage help

I have recently bought this traffic arrow from a surplus store and i cannot find the input voltage anywhere on the net. it has a built in switch mode power supply from what i can tell and i think it is 120V AC but am not sure. the arrow is a GE Gelcore LED Traffic Signal. ANY help would be appreciated.  thanks

Posted by devicemodder 5 years ago

A/C Wireing Problem

I need a A/C 120v wireing diagram that show the best way to wire a Router, Blower & Saw so would run as follows. (1)Router & Blower at the same time. (2)Saw & Blower at the same time. (3)All off at the same time,can this be done using a Double Pole Throw Switch ? if so PLEASE send wireing diagram. :o)

Posted by kngokngo 10 years ago

Injection Molding Machine for Sale

This posting is for a small plastic injection molding machine for sale. It is lightweight and compact, but has large 2oz maximum shot size and 12tons clamping force. It can also be operated from 120V power supply. The molds for this machine are easy to make, since they can be made out of aluminum or reinforced epoxy. The price is $2875. Since it is compact, the machine is shipped by UPS to avoid expensive freight charges.

Posted by lfiore 6 years ago

Multi- 9v or 12v outlet setup?

Does anyone know how to make or where to find a single wallwort (120v outlet) that has multiple 9v or 12 v out plugs? I've got alot of little electronics (mainly things that light up/ glow) and I hate all the blocks and power strips that I've got to use. (I'm in the US btw.) Thanks for any help! The Atomic Soul

Posted by TheAtomicSoul 10 years ago

UK 240 volt to US 120 volt step down converter.

Hi Folks. I was chosen as an alternative winner for the camera & photo skills challenge & received my printer a few days ago. My problem is that the printer I received is a US specification one meaning it is set up for 120v & in the UK we use 240v; I have been trying to find a 240v to 120v step down converter for it but so far have had no luck as I need one with a functioning earth & the only ones I have found are not suitable as most of them do not have a proper earth pin available, the few that do have an earth are far beyond my current available budget. I have tried EBay to no avail likewise Maplin, eBuyer & PC World; does anyone know somewhere in the UK that I can purchase a suitable one that does not cost the earth? (Pardon the pun) Thanks in advance for your help folks. Seasons Greetings to you all. Nostalgic Guy.

Posted by Nostalgic Guy 6 years ago

Help! Alarm Clock Renovation

Alright, this is a crazy class project I've taken on, so bear with me. What I want Alarm clock display that can be custom programmed to a non-time sequence.  (IE: 666, 777, 888, etc.) Programming above sequence to blink repeatedly. Converting alarm clock from power cord to battery. (Not necessary, but one of the models has an old AM/FM radio display. Making this display move "randomly" would be amazing.) What I have Alarm clock #1:  Model No: KMC 500; "Electronic LED Alarm Clock"; Power supply AC 120V 60HZ 5W Alarm clock #2: Trade Name "Realistic"; Chronomatic-233; Model No: 12-1540; Frequency Range: AM 520-1620KHz  FM 88-108MHz; Power Supply AC 120V 60Hz 10W Cold soldering kit Limited budget If it would help, I could take pictures of the clocks mentioned above. They're from the 70's, with the "simulated walnut grain finish" and red display screens.

Posted by Kizoku 7 years ago

UPS battery backup as car inverter?

I hope this isn't a dumb question, but if I were to take an old UPS unit, remove the battery, wire a 12V lighter socket plug to the battery cables in the UPS, and plug it in to the car, would it convert the 12V DC to 120V AC while the car is running? And if it worked would it draw too much power or damage anything? I wouldn't use this to run anything with a motor, just a laptop charger and maybe a light. Thanks! :)

Posted by 500FPS 1 year ago

Simple Project Help Please!

Heres the deal: I have a set of old computer speakers and a pair of computer case fans that just happen to fit inside the speaker housings. What I want to do is utilize the existing power cable (input: 120V 60Hz 25W, output: 15V DC 800mA) to power the fans. The fans are both labeled "12V DC 0.2A" and I really just want to know: A) will running the fans at 15V damage them, and B) is there anyway I could control the fan speed?

Posted by britishgecko31 11 years ago

RC ducted fan plane

My Mom recently aquired a new blender for christmas and I was able to salvage the very massive motor from it. it is a 120v 430w motor. I want to be able to make it remote control with an esc and some rc gear I have. I need help either creating one or somewhere to buy one that would work with this motor. I could also use arduino to control it if needed but would need a program. Thanks in advance for all help recieved.

Posted by itri45 6 years ago

Identify OLD Electronic Components!

So today, i found a VERY old radio, it was the size of a cabinet!it had;some 2 12"s (the voice coil diameter is about 1.5")2 horn drivers!120v transformer, 30Vac 3 Amps, 5.5Vac 6 AmpsAnyway, i pulled some transistors (not vacuum tubes, which was what i was hoping for) out, and i need to identify them! and find the data sheet tooThank you in advance!Update;The last picture, those are npn transistors with hFE of 300

Posted by Sandisk1duo 9 years ago

"Published" Instructable, but can't be found?

My Instructable "120V A/C Lamp Flicker from LED Votive Candle Type 1 (COB)" shows published in my personal account info, but I can't seem to locate in the regular search. It also shows 0 views, which is pretty unusual. Note: I did enter this in the Halloween contest (1st contest entry), which I know is moderated. Does it have to be approved by the contest moderator before it shows up to the general public or have I screwed something up? Thanks! Steve

Posted by sr1sws 10 years ago

How do i open a flood light

I have a 120v burned out philips 90 watt flood halogen light i noticed that the top has some sort of glue that holds it together the lens(top)is glued the the bottom is there any way i can like melt the glue to take the lens off? i want to put some led's in there so that i can reuse it i want to reuse the reflector and put led's in it thanks and please reply

Posted by ReCreate 9 years ago

Help: NiChrome wire, making a dry/cure/melter panel 330f

Hi, Can anyone answer a few questions for me or direct me to a site for Nichrome information?   My background:  I'm more into mechanical tinkering:  drill press, saw, lathe.  I have minimal skills in Arduino.   I have very little understanding in Ohm, Resistance, etc....many things electrical.  I can read an electrical schematic and build it; but, I have no clue how to design it. My purpose for this:  heating panel for vacuum form machine as well as a curing plate on top of wet paint and coating (two different machines). I'm trying to make this:  http://www.infraredheaters.com/solar-f.htm   <--- something like this with it's blown air as a convection-like dryer over water base coating. My requirement is:   1,  120v prefer, highly desire.  220v isn't an option at the moment until I move to a new place. 2,  +250-350f temp range, I'll be using an Arduino to set this up 3,  14" x 18" panel 4,   as efficient as possible, I want it as close to 1000watt as practically possible. My questions are:  size of nichrome?  length?  How tightly should I pack the wires.  Should I use a dimmer switch to control the heat?  would that be a good idea?  Where can I find information to get 120v AC into nichrome to give me 330f without killing myself or burning down the house? Thanks!

Posted by Alpha Odyssey 7 years ago

solar energy using photons

 (( the opposite of gravity is radiation . there for light is radiation . which cary photons . now if you have a turbine in a vacume filed with a gas (mecury )the photon will heat the gas making a presusre that will turn the turbine but i was thinking. add a denamo to the shaft insde the vacume . when mecury heats it expands .at lest try to make 12 volts add a capsitor -to gel batteries -  transformer from 12v to 120v now modify the transistor to make 220 . havent found any info online.at longest there is light from the moon or the sun it will work. ive discused this with enginerr they think this might just work . all the variables are here any sugestions fell free to ask  

Posted by jalvarez15 7 years ago

Mystery part!

My sister brought me home this part tonight from tech crew at school, she says she thinks it came from a fire alarm but were not sure. There are 2 lightbulb sockets and engraved on the metal it says "75W -125 v". Out of the back there are 6 wires, 1 red 1 black 2 white that are going into the large thing in the middle, and 1 black and 1 white coming out of the empty socket. the 2 sockets are also wired together. What is this part? is it simply a power supply with 2 light bulbs? The label says "Lithonia emergency systems on it" "input : 277 at 60hz (wht and black) output:120v 21.6VA (wht and red).

Posted by astrozombies138 10 years ago

How can i convert My Boom box to rechargeable batteries?

OK so here is the Deal I have one of those little cd player/ tape player boom boxes. THe sticker reads "Power Supply: AC~120v 60hz 14w, DC 12v (1.5Vx8 "c" size, UM-2 Batteries) I want to be able to use a reacharge battery. My main goal is to not waste batteries and also be able to charge the battery pack by pluging it into the stock ac outlet. Please anyone help.. Im hoping eventully to mod the tape palyer for my ipod then taking the components and mounting it into a Waterproof pack for a boom boom back pack!

Posted by iathon 11 years ago

Lighthouse pulsing light

Hi all - I am building a wooden model lighthouse, it will stand 5 feet tall and become my driveway landmark. I have been searching for a good light circuit, a non-LED version, preferably using 120v AC. I would like the light to just do a slow flash or pulse and haven't found a circuit anywhere. I did find one SCR simple circuit using a high rated capacitor, but I am looking for more options. I have a coloured halogen which should do the job well enough. So have any of you brainiacs come across any circuits close to this description - thank you for reading / responding. Bill

Posted by bstacy37 2 years ago

Help sought for DIY 12V for 120V Blender Boat Motor

Howdy, I’m hoping someone could give me a hand with jerry rigging a DIY trolling motor battery for a small boat (not a toy, but made out of many many water bottles, pvc, etc.) that will not get too much use. I need it to be very inexpensive and reasonably light. 10 D cells in a PVC pipe would be great. 20 would not be too bad. I am pretty much electrically illiterate. Here is what I have so far. I have an immersion blender … one of those things that Emeril Lagasse calls “boat motors”. I can attach a drive shaft and propeller to it. Because it is designed for being in liquids with more resistance than water (though with a smaller prop/blade), I think it will have sufficient torque to get some push. I will not know if it is enough until I give it a try, but I do know that weed wackers can be so converted and I don’t think they have much torque. The part I am stuck on is hooking it up to batteries. It is a 120V plug in device. I have a small 75 Watt inverter. I can plug the blender into the inverter and that into a car lighter and it runs well. I have hope! I understand that I should have 120 Watt inverter, but 75 is what I have. I have an accessory car lighter outlet to plug the inverter into. It has a red line with a fuse box mid way and a black line, identified as a ground line with a loop at the end. The directions say to screw that loop into the frame of a car and connect the red to the hot battery line. But as I am not using a car that is not of much help. I tried stringing 10 AA batteries together end to end, temporarily held snug with duct tape, and connect it to the inverter with the accessory lighter plug outlet, but I did not have any luck. The motor did not spin and the inverter power light did not come on. I used electrical tape to connect the red to the positive end of the string and tried taping the black to the negative and also to a knife to ground. I tried AA as I know those will get used one way or another. I did not want to invest in D’s until knew it would work. As I understand it, D’s will last longer. (I am not interested in re-charging). Since then, I came across a few bits of info on another site. One thread mentioned using a spring from, say a flash light, at the negative end and a bolt at the other. Another said that PVC was great for grounding. Some useful bits of info are that in addition to the 120V, the motor runs at 1.0 Amps. I do not know if the 60 hertz is relevant. Does any one have any ideas about how to do something this? Do I just need to replace the fuse and try again with D’s? How do I connect the lines? Wrap the red around a bolt through a capped pvc tube and tape the ground to the side of the tube, with a spring in the other capped end touching the negative end? Do I need two 10 series in parallel? I can stack batteries end to end, but how do I connect parallels, especially without soldering? I do not want to use a 12 volt car or marine battery. This motor is not going to get enough use to justify the cost of such a battery and charger and I do not what to deal with the weight. If I can get 10-15 minutes of power from a stack of D-cells (hopefully more time), I would call that a success as this is a learning experience as much as anything. An hour would be much better. Thanks in advance for any help.

Posted by Wolfsire 11 years ago

Looking for Info On These CNC Motors For Replacement

I purchased a surplus 2-axis CNC machine with built by Yamaha. I hoped to rebuild it into a new machine for myself, but it ended up requiring 200 volts AC for the controller and motors, which I don't have access to. I sold off the controller already. I don't know too much about professional CNC macahines, hoping someone has some input. I am hoping to replace the motors with ones in the same form-factor that run on DC or 120v AC(if such thing exists), preferably stepper type. I do not know what form-factor/package/mounting style to look for, or even if any are available with the power requirements I want.  Motors are the same for both axis and are part#: TS2620N664E122, attached are some pictures. Thanks,

Posted by ChromationSystems 2 years ago

low voltage photoelectric switch for led spotlight

I need help. I am making an led spotlight to mount on the flagpole and light up the flag at night. I have the lights from a 46 led flashlight. I've attached 2- 3.7v Li rechargeable batteries and a solar cell charger. Everything works great, except I want a photoelectric switch to turn light on and off. Right now, it is on a manual switch mounted to the pole. I cannot find and don't know how to build a 3.7v photocell circuit. I've tried 12v (all I can find except for 120v) and they won't work. I need to know what I need to make a 3.7v circuit/switch, and how to tie it in to the existing system. Can anyone help me? Thanks for any input. I am a novice, so be gentle. BJ

Posted by cottnpickr 10 years ago

Making a portable turntable portable

Hello all, This question is definitely burning an I hope everyone can help out. I have a couple of portable turntables but only one is actually portable. They can all be plugged into the wall but only one can be powered by 6 "D" batteries. The mission is to convert/adapt one of the plug only ones to run off batteries. They are about AC 117v-120v/5.5w-6w. Is this as easy as soldering a + and - cable from a diy battery compartment to the circuit board. Or will something be needed in between the batteries and the board to make the power acceptable? Also how about adapting it to take a Li-Ion(or similar) battery that could charge when it's plugged in? This sounds like it would be more complicated though. Just getting one to run on batteries would be grand. Thanks for any and all info.

Posted by lovlss 10 years ago

3 way light switch push button, working at low voltage controlling line V light

I'm adding an additional light to a room with 2 entrances in an old house. Instead of using the common 120V 3-way SPDT switches to control the light fixture from 2 points, I'd like to use a relay (or something electronic) directly connected to the load of the light, and I'd like to run low voltage wires to push buttons located near the doors of the room. These will control the light by one press = on (if the light is already off), and the following press will = the alternate condition, the light going off. IOW, the push-button will toggle the on/off condition.  There should be a commercially available relay (some kind of latching relay, perhaps) product with the circuit. Can anybody recommend something? Or, perhaps I could put together the components myself. Does anybody have a schematic of something along these lines?

Posted by nehmo 1 year ago

Solar storage help

Hello! I'm new to the forums, but I've read many instructables. I'm looking to create a solar-charging messenger bag. I decided on a powerfilm flexible solar cell that is 7.2v 200mA. Amazon has them for slightly above $50. I originally wanted to use a xtreme mac Incharge portable to store the power,(PLEASE CORRECT ME IF I AM WRONG) but I think that may take too much to convert it from 120v in to 7.2v in. The benefit of this item is that it has two 1w usb output charging terminals. That means faster charging.  The second idea is to send the solar energy to four AA Energizer rechargeable (1.2v 2500mAh) NiMH batteries. The benefit of using AA batteries is they can be used for other things and that they can be easily replaced after running through charging cycles(I don't know the life cycle of rechargeable batteries anymore). Any assistance offered would be greatly appreciated. I have the bag, will be ordering the solar cell later this week, found the incharge portable at a thrift store, and always have plenty of batteries and wires. Thanks!

Posted by chokingjaik 6 years ago

I'm making a lamp...

Hello Instructables community! I'd like to make a desk lamp, and I'd like to plug it into a wall. Now here is my dilemma I have, the lamp would have 9 main lights inside glass globes and I'd like to have small little lights (like LEDs) around the outside like little points of light. Now in my experience LEDs aren't typically plugged into the 120V wall socket. I have a friend who's good with electronics who has tossed around LEDs, fiber optics, etc and it's all just mind boggling to me. He's even suggested using some kind of controller to make the small lights twinkle and I have no experience with that kind of thing. I'd appreciate if I could get some input as in what options I have for lighting this lamp. Right now it sounds like a valid idea is to use "super bright" LEDs for the 9 big lights and just regular LEDs for the multiple points of light around it.  I can provide as much additional details as needed. Thank you for any input.

Posted by hzillmer 4 years ago

looking for reference/info on basic electromagnetic coil design

I am an inventor/re-designer and work with a wide variety of technology, tools and materials.  I repair all of my tools myself and have built a number of custom tools and devices. I was a professional auto mechanic for many years, as well as growing up and working as a building contractor for many, many years.  From those and other experiences, I have been exposed to many different coil-based devices. I have been replacing/repairing coils, coil actuated valves. relays, etc for 30+ yrs, but I've always just replaced the coils with the appropriate new part. I did rewire a relay last year, for the first time, when I couldn't bring myself to pay $80 for a new coil.  I measured the wire diameter, then carefully uncoiled it, measured the length, then rewound it with the same length of wire.  I figured it was worth the gamble of $4-5 on wire.  It works and controls my 240v air compressor, but it was a bit of a tenuous and nerve wracking job; I had wire ALL over my shop for an hour or two. I'm finding a need/desire to understand how different voltage coils, ie: 12v DC, 120v AC, 24v DC... are calculated/designed.  Can anyone point me to a resource that will explain the process on a non-electrical engineer basis? Thanks, GeoD

Posted by GeoNOregon 4 years ago