120v AC to 120v DC

Basically I want very strong electromagnets for a gauss rifle that I can power from a home power outlet... Disregarding safety and efficiency, would a 120vac-120vdc bridge rectifier do what I want it to do? Maybe? Hopefully?

Question by ColinF14   |  last reply

Is there an explaination on here on what i need to do to make a 120V LED lamp?

That plugs directly in to the wall? I would like to know what all of the parts do. Thanks?

Question by gimmer22   |  last reply

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.

Topic by TeratoMarty   |  last reply


Often a GFCI is too sensitive outdoors. But I've heard that an isolation transformer might save you from electrocution. How safe would an isolation transformer be for running a fan, angle grinder, blower, space heater, etc outdoors? Where can I get one that will handle the amps I need?

Question by Toga_Dan 

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.

Topic by mnc615   |  last reply

Does it exist? 120v inductive indicator light system.

 I run a car wash and I need a way to quickly tell if equipment located in hard to get to places is on and working or not. What would be great would be a remote bank of lights that came on when a device was drawing current. What would be perfect is if I didn't have to wire it into everything - for instance inductive sensors (like the cheap ones you can buy at HD that beep and flash when current or voltage is present) that can be placed on the outside of a wire run and report back to the bank of lights whether or not there is current flowing. Anybody ever seen anything like this? Murphm7

Question by murphm7   |  last reply

Converting 120v motion sensor to run on 12v?

HomeDepot sells a motion sensor for home security lighting with a 270* viewing angle for $22. I'd like to convert one of these units to run off of 12v, keeping the timing relay intact. Has anyone attempted this?

Question by skuypers   |  last reply

Where to find a 120V to 12V transformer?

I want to make a "styro-slicer" which needs a 120V to 12V transformer. I would like to scavenge it instead of buying it.

Question by Lugfg001   |  last reply

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?

Topic by ravic88   |  last reply

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.

Topic by Deepeyes   |  last reply

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.

Topic by DavidN71 

Can I make a 120v AC electric motor run off a battery?

I took the elctric motor out of a leaf mower and was wondering if I could get it to run off a battery . If I can get the motor to run off a battery then I will be able to use the motor to make an electric skateboard.

Question by    |  last reply

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

Topic by matthew6   |  last reply

Piezo triggered power socket for rope lights or led strip?

I'm an electronics beginner. I generally know what components I need for my ideas, but I don't know what specs or how to put them together. I would like to create a socket similar to the one pictured that is triggered by a kick drum, so that I can have rope lights strung around the drum riser flash whenever the drum is hit. I know I will need a piezo element and a transistor/relay. I have read that transistors are more instantaneous. Is this feasible, or would it be more practical to use an led strip? A list of components and advise on how to put it together or links to tutorials would be greatly appreciated.

Question by pacello   |  last reply

120V MOT transformer on 220V for spot welding machine? Answered

Hello i'm making a Spot welding Machine using a microwave transformer i'm removing the secondery coil to replace with 2 rounds of very thick wire for the output . the only problem is the transformer rated for 120V input Will it matter if i connect the primary to 220v ? i'm replacing the secondery anyway ?

Question by pixema   |  last reply

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!

Topic by awascholl   |  last reply

I have a 120v DC system for a 350w lamp. I want to change it to an LED.

I have a 120v DC system for a 350w lamp. I want to change it to an LED. What do i have to put in line for a 12v LED to work?

Question by rockinbones   |  last reply

Gas furnace plugged into 120V solar/wind generated power bypasses the thermostat control and starts immediately. Why?

The sine wave generated by my 12v to 120v inverter scopes even better than the grid current.  All other appliances function normally on off-grid power.

Question by Twicewidowed   |  last reply

120v light circuit that flickers and dims - imitating candles?

I want to build a device that plugs into a wall plug then to plug in a lamp that makes the light flicker and dim just a little. Not a whole lot. Scary effect. Schematics please? Dont want to buy. I'm going to plug in 400w all together into this device. -I am running 6 lights that are all the same. I not going to replace them with actual flickering lights. I would like for them to flicker at the same time at night for scary effect.  Thanks-

Question by alpe_97   |  last reply

ASAP!!! Converting an 120v AC charger to run off 12v? Answered

Basically, I have a camera battery charger that runs off of 120v AC. On the charger it says it outputs 8.4v at .43 amps. I have a solar panel that does 12v at 300ma (or 6v at >1A). Could I take the charger, and wire it into the solar panel? I know the output of the panel at 12v is less than the charger, but it might be able to charge. Has anybody done anything along the lines of this? I would be really happy if I could charge my camera batteries from the sun, as I am going on a trip soon, and they don't have a great power system :) The batteries are LI-Ion, so they DO need a charger...

Question by astroboy907   |  last reply

12v DC to AC 2000W inverter mod into -> variable frequency drive? Answered

I wondered if anybody could guide me in the right direction. I'm trying to make a variable frequency drive by adding a square wave signal from a signal generator to the set of transistors within the inverter itself. The signal generator is putting out a 8v square wave to the outputs. Also, this is the inverter i was looking at "http://dcacpower.com/index.php?main_page=product_info&cPath;=1&products;_id=5" Can somebody please help?

Question by imMrDude   |  last reply

Wiring motion sensing light to include a 120V AC siren?

Here's the goal: to have a wired, outdoor, motion sensing flood light that includes a 120V AC siren that will also sound whenever the light is triggered.  The proposed setup would start with some sort of switch or hidden switched outlet (possibly WeMo so only I can control it and I can also tie in some IFTTT recipes) that the whole system would run through.  Power would then run to an off-the-shelf motion sensing flood light not unlike this one.  From there, one of the light fixtures would be rewired to run power to a 110V AC horn/siren not unlike this industrial unit.  Is there any glaring reason that this would not work, and what considerations should be made vis-à-vis the fixtures wattage rating and the rating of the siren?  The final product should be something that when switched off is just that...off, and when switched on would trigger a light and a very audible siren.  Finally, any ideas on where to look for a siren/horn like the one described?  The industrial unit in the link might be a bit too big. fdsafdsa   fdsaf(not un From

Question by robodoppleganger   |  last reply

Using a Dimmer for Power Tools?

I want to make something for my 120V AC Black&Decker; Jigsaw, But it will cover the trigger. My question is: Is okay to use a 120V/110V AC Dimmer (PWM?) to control the speed instead? I can keep the jigsaw's trigger at "full power" with a zip-tie, But the control the speed control will come through the dimmer... Are there any problems with the fact that the jigsaw is an "inductive load"? If it is, Can I improve it with a capacitor? My jigsaw uses 4.5Amps @120V, How many Watts is it? (IDK the formula for AC Watts...) Is there any more information that I missed? Thanks,     Yonatan

Question by Yonatan24   |  last reply

I have an older General Electric 120v DC motor that I need to run on AC?

Just like the title I have a 120 v DC General Electric motor that I want to convert so it will run off 110v AC or basically house current.  I am not a cheapskate but I am on a really tight budget ( alright enough whining).  Thanks

Question by dwilson54   |  last reply


Would like to wire dollhouse with led lights, going from 120v down to 12v,also be able to turn each room on and off.

Question by richard dodds   |  last reply

How can I make a Ac to Ac converter with variable frequency? Answered

I intend to make a devise where it would have an impute of 120v ac at 60Hz and have a output of 120v ac at a frequency between 10 and 60 Hz and could be changed with a variable resister in fine increments. this also needs to be able to handle 10 amps.    any ideas, I would appreciate all help 

Question by alexander.m   |  last reply

How do I control power output of 120v electronics with arduino?

Hello,  I have a device with a motor that my killowatt measures at 120v and at most .220ma. I wish to use an arduino uno to control its strength (reducing it down to maybe 25% at times). What is the best way to go about this? I have seen many different tutorials with different methods. I would rather not cut any of the cabling or open the device.  A motor shield on ebay seems to be the easiest way so far from what I can tell, although there does seem to be a lot of different options for h-bridges. Can someone point me to some good information or tutorials that would be the most effective for this type of power requirements? Thanks in advanced.

Question by d3icidal   |  last reply

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...!!!

Topic by SummitSeeker   |  last reply

Operating a transformer at half the voltage? Answered

What could be the effects of the output when operating a transformer at half its rated voltage, specifically to the amperage? as two examples: If I had a transformer rated for an input of 240v and an output of 20A at 24v and I was to supply the primary with 120v, what would happen to the output? If I had a variac (autotransformer, variable transformer, ect.) and it was rated for an input of 240v with an output of 0-260v at 11A, what would happen to the output ratings at only 120v?

Question by pmk222   |  last reply

How do you convert an ATX power supply for car use?

I want to use an ATX or AT 120V computer power supply in my vehicle.  I assume one can just put the 12V supply to the section of the power supply after it has been converted (120v to 12v) and rectified (AC to DC).  From there the circuit can supply 12v or 5v but I'm more interested in the 5v but would also like to run a computer occasionally or permanently (further down the road...so to speak).

Question by earlby44   |  last reply

How do I build a simple 120v/240v ac voltage indicator?

I want to build a small voltage indicator light which will tell me whether a circuit is putting 120vac or 240vac. I will also put in a fuse tester (easy enough) but these functions will give me nearly everything I need for my job (unless someone can think of a good ammeter circuit which would indicate at 0-40A in 5A imcrements- I'm not getting my hopes up on that...)

Question by greatpanda   |  last reply

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?

Topic by Avren5   |  last reply

LED accent lighting

I want to add LED accent lighting to the mirrors in my bathroom renovation. I installed receptacles behind each mirror Can I power a short LED light strip with a USB charging block plugged into a 120v receptacle?

Question by MONROEJOE   |  last reply

Component Compatibility Answered

What do I look for when trying to find components that work well with each other? For example: If I have a 120V, 6.5A motor; how do I know what type of on/off switch to use?

Question by luch   |  last reply


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.

Topic by ruben_vleuten 

Voltage conversion for halogen bulbs Answered

I need to convert 120v to 12v to power four 12v 20W halogen bulbs. What type of converter do I need, and with what specifications? Where could I find one. Is it possible to dim the bulbs?

Question by kf746   |  last reply

What is does 200 mA stand for on a power supply?

I am trying to figure out the amps on a power supply. It has an input of 120v, 60 Hz, 4w. Output is 6VDC, 200mA. I just don't know what the mA is.

Question by bbierbaum   |  last reply

Garage door safety sensor wiring?

I believe it is an infrared sensor with two wires on each. I have wired them to a 120V plug and the LEDs on them turn on and my motor spins slightly (probably just because it is a 120V motor and it's not getting enough electricity) but I try to line up the sensors and they do nothing different even when crossed. What I want to happen is for the motor to remain off until the beam is crossed. Once crossed I want it to spin and to keep spinning until I disconnect it. I would really like to put an alarm on it so when crossed an alarm goes off. Does anyone know the additional things I need and how to wire them? Thanks

Question by chiefs543   |  last reply

"Shunt" diodes with resistors? Answered

I'm making diode bridges to have a nice supply of DC. I'm making a high voltage bridge for a 7.5kv nst and a low voltage bridge for regular 120v wall outlet . My high voltage bridge im going to make with several 1N4007 but i read that they should be "shunted" with 10Mohm resistors im not sure what is meant by this. Does it mean resistor, diode, resistor, diode or does it mean diode and resistor, diode and resistor. The pic says it better than i do.  Also, do i need resistors for a bridge for 120v bridge?, im going to use the diodes from a fluorescent light power supply.

Question by jaydenr   |  last reply

Can I use a 10 amp 120 volt relay for more then 10 amps if the voltage is lower? Answered

I am currently working on a mini A/C with a TEC that draws 12V and 12 amps and the relays I want to control it with have a rating of 10 amps 120v. not sure if it is as simple as this but 10A*120V=1200 watts. While 12A*12V=144 watts so in my eyes this would work because there is much less power flowing through the relay but I would like to request advice from someone who is a bit more knowledgeable then I. Help would be greatly appreciated thanks a bunch. Harry

Question by harry88   |  last reply

Controlling Solenoid Valves from a Computer?

How would I go about controlling a few solenoid valves from a computer? These valves run off of 120v source. I understand the question is vague, but anywhere to start me off would be great. Thanks, Austin

Question by Newman180   |  last reply

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?

Topic by Sandisk1duo   |  last reply

I need a relay to run from an ATtiny85 chip.?

I need a relay that can be switched from an ATtiny85 chip output pin, and can be used at 120V AC and 15A. Otherwise I will need to use a transistor, but hopefully I won't. What about the ATMEGA328 instead of the ATtiny85? Thanks guys and gals.

Question by Geniusdude   |  last reply

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?

Topic by merlinj   |  last reply

Quick question about relays?

Hey everyone, just a quick question here. I need a relay that will operate on 12V DC or less that can withstand 120V AC @ 2A (US sockets are 2A correct?). Would this work? Or am I oversimplifying everything?  http://www.radioshack.com/product/index.jsp?productId=12505678&retainProdsInSession;=1#tabsetBasic

Question by Geniusdude   |  last reply

Change a projector lamp to LED ?

I have an Infocus model x1 projector the lamp is burned out how can i change the lamp to use a high power LED bulb the lamp is 100-120V - 3A 50/60 Hz input I've never done this level of electronics but lamps for this thing is almost 250 bucks .... Thanks

Question by fretted   |  last reply

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!)

Topic by Sandisk1duo   |  last reply


Is it better to run 120v wiring to each pot, or run 2 wire 18 gauge cable to a central box. LED's are 12v 3w dimable. I would like to dim from 2 to 10 pots per switch. Where would I put the transformer. Could you suggest a  wiring diagram.

Question by NEIDO   |  last reply