HI EVERYONE. i WOULD LIKE TO KNOW HOW I CAN CONVERT MAINS 240V TO 12V SO I CAN CHECK CAR RADIOS OUT BEFORE I FIT THEM, Thanks all.
Question by smedcoates | last reply
I was thinking, wall transformers only transform so much energy(70-90%?) the rest goes off into heat. so, wouldnt it be better to charge 160 AA batteries at the same time in serial (thus making 240V) directly off the wart? i know this is just theory, since its not practical, not managable or anything, but i just wondered if it could be done. would this solve the energy loss from heating the transformator up?
Question by godofal | last reply
I have recently attempted to rewind an old 240V AC drill motor to a low voltage DC one. After winding the 12 coils I found that all of the windings were shorted to each other, I'm assuming this is due to the thin enamel coat on my wire breaking against the edges of the steel core. As a result I need to rewind it, but I am unsure what kind of insulation to use, tape, some kind of glue or sealant, varnish, I was thinking a hardware store type product nothing online or that costs a lot.
Question by The MadScientist | last reply
I need a circuit that will flash a light at fairly accurate regular timed intervals. Perhaps the easiest might be a battery circuit with LEDs, but flashing a mains-powered light would be OK if easier. It is for use as a light metronome, so I need to be able to vary it to between 40 and 200 flashes per minute. Have searched the net: lots of flashing circuits, but none that can be varied in tempo in a reasonably accurate way. Grateful for any thoughts!
Topic by LDW | last reply
Hello all, I'd like to purchase a welding machine in the USA and take it to the Philippines. My problem and hopefully solution is, USA use 2 legs of 110v for 220v appliances/machines. In the Philippines, voltage is 220v (single leg). So, If I have a single phase, 220v welder, can I cut the plug off, combine the two power legs and connect to the power in the Philippines? I hope I am able to articulate this question properly. Mig welders are not easily available over there. Thank you for anyone that can help
Question by TerryH74 | last reply
AI have a millermatic 211 which is a multi-voltage welder which I will be bringing to the Philippines. The adapter plugs are 5-15p (120v), and 6-50p (230v). Philippine electricity mains when I live are 220v single leg, with neutral. I am adding ground to both the Main panel and sub panel when I arrive, as most residential homes with a 2 wire system do not have them installed. According to the welder schematic 6-50p adapter configuration shows white, red, and green (ground) so goingfFrom a 3 wire US to 2 wire Philippine system is it proper to wire L1 to red, neutral to white and green to ground? 6-50 receptacle does not seem to incorporate a ground in typical installations????
Question by Antonioo35 | last reply
Need to have an AC adapter 110-240v to power a 48VCD fan. The specs of the fan power are as follows. rated voltage 48VCD operating Voltage range 36-60VDC input current 2.07 input power 99.3watts wiring of the fan are as follows. Red Wire Positive(+) Black Wire Negative(-) Blue Wire (F00) Yellow Wire Speed Control (PWM) I just want it to power at full ability. Any help would be awesome.
Question by cyc1on | last reply
Hi, from a brand new poster. I have a farm water pressure system in a shed, mostly watering troughs for stock. When there is a slow or fast leak, I waste water, at expense. They could be broken valves to pin holes in pipes. The pressure is system is run by 240V mains, (Australia) via a plug into a socket, as normal. There is a smart meter in the shed. Stock generally don't drink much from midnight to 5am. If there is a constant leak, the pressure system will cycle during the night. What I want to know is, is there a way to trigger an indicator that shows the pressure system is cycling overnight between set hours (12 - 5am)? Eg, a few cycles may be acceptable, 5-10 are not. When noticed, I can go to the shed, further investigate, and reset the trigger. I also have capacity to read water pressure at my house, on the same system, which will fluctuate as the pressure system cycles. If I could easily track and record the pressure fluctuations, I would also know if there is a leak. Apparently I could install a flow meter with a wifi or sms system, but that sounds expensive and complicated. I don't use a flow meter as it is not needed. So we have power usage, pressure switch triggering, water flow, water pressure , noise, and pump heat as indicators, at the pump shed. I have line of sight to the shed from my house, about 500m away. I could see any alert lights daily, both at dark in the evening, and in morning daylight. They could be 240V or battery powered. I am currently tapping into the pressure switch to run a light. The problem is 1. I have to be awake then to check a light. 2. it takes time for long cycles to occur. For all I know there may be something available already, which I have not yet found. I don't have need, yet, to be alerted as an absentee manager (eg sms alert). I know there are fancy systems available for sale for that. Any technical ideas would be most welcome, thanks, including combinations of the engineers parameters - cheap, strong, quick.
Topic by farmfencer | last reply
I n the manual the devise is 100-240 0.3A and my available adapter is 220-240V output 9VDC 300mA is it safe to use
Question by jovenhatsjr | last reply
I am trying to power 12no 3w 12vdc bulbs starting with 240v mains. i have found a 240v - 12vdc driver/transformer meant for LEDS but not sure what wattage output i need, 40w?
Question by ciderpig | last reply
Question by pathseeker | last reply
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
Question by lanie ramos | last reply
Hi so I was bored and decided to make an electromagnet out of a microwave transformer by taking the secondary off and keeping the primary. I hooked it up to some 9v batteries and stuff but it wasn't that strong so I researched it a bit and found out you can hook it up to the transformer input voltage (which was 240v AC) so I did but when I turned it on it made this very loud buzzing noise and I thought I saw what looked like flame in the socket. I turned it off imediately and unplugged everything. Whatever the magnet did must of been strong because it broke itself apart slightly. I tested the sockets with a multimeter and they still say 240v but I just want to make sure I didn't do anything bad to it. Also did anything actually go wrong or was this all meant to happen?
Question by jlandreth1 | last reply
I don't have any particular type of 240v pump/filter in mind but do know that it will be small. The actual pond is a decorative water feature and holds maybe 30 litres.
Question by lizzym07 | last reply
Hello! So I found this transformer the other day, it's a 240v to 75kv here where it's gets interesting, it's a shell type, with two separate transformers I'm guessing. It has a input for 240v on each end, it has 1-5 taps but 1 is not used 2 is phase 3 is neutral 4 is earth and 5 is not used. It only has condanuity between 2 and 3 on 240v side. On the high voltage side it has only one output and no condanuity to the core or anywhere, So I'm confused. I'm wanting to make it in to a high voltage Jacobs ladder setup. I have a varic that is 240v and goes from 1v up to 280v on the wiper side it is motor driven. Can I arc between the two hv posts? Also both transformers are have the same phase in parallel. Please help me!!!!! Thanks!
Topic by nz dude | last reply
I already have an LED torch that charges off AC it has a set of four diodes(supposedly bridge rectifier) and a big brown shiny TANK type of thingie which is all connected to the rechargeable battery in it(donno specs). Hoping to make one of those.
Question by mayur.phadte | last reply
I recently pulled an old squirrel cage motor out of a fan (which was still working). And i have no idea how to wire it up. it has a red, yellow, blue and black wire coming out. There is also a 1uf capacitor, it has about a 1200-700ohm connection between the yellow blue and red wires. their is a 100ohm connection between blue to yellow, 200ohm between yellow to red and 300ohm betwwen red to blue. black doesnt seem to connect to anything. could someone please help me. A little label on it says: Motor Mode: R12-1 220v-240v 50Hz 40W Foshan Shunde Rihuang Electric Co.,ltd (mode isnt a typo by me, thats what the label says, though the company may have meant model)
Question by makincoolstuff | last reply
I want to light my room's ceiling edge with led lights which can change colors using a switch. I am not so good with electronics, except for basic stuff!! SO would like a nice and elaborated guide to build this. Thanks.
Question by CeramicPlate | last reply
I am creating a home automation device that uses an arduino. The devices are connected to a relay. The real problem is I am using a using a DTMF decoder with the relay, while the relay works only with 12v power supply the DTMF decoder works only on 5v input (USB from computer to arduino). The devices that I know of are capable of converting a 240 v to 12v or 5v not both. What should be done so that I am able to get a 12v and a 5v from a normal 240v household power socket?
Question by NirmalMRaj | last reply
Hi, I have recently acquired a 110v 60Hz Soldering station but i live in a country which uses 240v at 50Hz. I can get a stepdown transformer to convert the voltage (can choose between 50W and 1600W), but i am wondering will the different frequency damage the soldering station? The soldering station i got is https://www.sparkfun.com/products/10707
Question by michaelgohjs | last reply
Hi 'nstructables I'm building a hovercraft (see several tutorials on Instructables - the one with a leaf blower) and my leaf blower is corded. I don't want to buy 25 miles of Black and Decker High Power Extension Cabling so I'm planning to convert to cordless. Here's my idea: (in visual) Is there anything I need to add? And if so, how do I make the "12VDC-240VAC" inverter described? My blower is 1600 watt. Thanks for any help! (Black and Decker)
Topic by nitrojon | last reply
I have a fluorescent light fixture that my dad gave me, it was about 9 feet, so I cut it in half and re-did the wiring so it would fit on my workbench. It uses a plug to turn on and off. I know the wall switches they sell at home depot are rated for 120/240v but they are cheesy looking and hard to locate in the middle of the night in my garage. When I come home from work on my motorcycle, I need an immediate source of light. Is it possible to use an illuminated switch, say from, Oreilly's or Advanced Auto parts and add some form of surge protection so it won't blow or pop a breaker? I want to use the same concept as a surge protector, it uses an illuminated switch, but only cause its components are protected by the surge. Is it possible to make my own involving soldering components on PCB?
Topic by bprins | last reply
Hello everyone, I just want to figure out how many 5mm super bright blue LEDs of VF 3V , IF 25mA i can connect directly to our 240v AC supply in series, only using a resistance in between. I google some circuits what i got :- 1) Android App named "ElectroDroid" can calculate Resistance for my 240v ac for 76 or 77 or 78 or 79 LEDs in series as 480 or 360 or 240 or 120 ohms respectively. I attached the screenshot with this question.. 2) A link http://led.linear1.org/led.wiz can calculate also but highest amount of supply voltage can be used 170V and number of LEDs i can use is 56 in series with 82 ohm resistance in it. so i think option 1 can be more useful because i dont want to use extra thing ( transformer i think ) in my LED string to step down voltage in series. OR if anyone can simply tell me how many of LEDs 5mm blue VF 3 IF 25mA i can use in a series directly to 240V AC supply with less complicated circuit
Question by redtulip4u | last reply
We have a problem with kids coming into our garden, vandalising our plants, breaking into our shed etc. we have decided that installing a cctv system in our home is a good idea as even if it doesn't stop them coming in, it will be solid evidence to take to their parents. problem is, we have regular power cuts and i would like the cctv to be recording 24/7/365 (especially in the shed because that is where our bikes get stored) i have two 12v 7ah SLA batteries that i am donating to the project, iknow that they need 13.8v and around 500ma to charge. i need 16 camera outputs, and then a couple of spare outputs for aux devices (router to keep it connected to the internet, mics, infra red lamps etc) the dvr its self wants 12v 5 amps input so i think for that i will make another psu just for that with maybe 2 or 3 12v 7ah sla batteries. i have baisic electronics knowledge, have access to pcb printing facilities and can use eagle. any help at all would be amazing, the main things i need to know is: how to get 13.8v from 240v ac, how to power all the cameras from 240v ac and have a smooth switchover from mains to battery. thanks in advance - luke
Question by ljarrald1 | last reply
I use a dewalt 24volt allday at work and every now and then it would be handy to be able to use 240volt mains mainly when i forget to charge the batterys.i have a collection of old unuseable batterys to use as a body but cant work out what transformer and or circuitry it would need. any ideas? cheers dave
Question by wavey davey | last reply
Hi all I have a 240v fog machine makes fog like a disco I wish to run it on a timer. For an outside dragon smoke display. I can easily time it purely off /on with a basic 24 hour household socket cheap timer MY PROBLEM The fog machine after getting power needs a press of a button to activate it. I need a circuit / timer so that when it gets 240v power can then "press the button "ie activate I bought a hi tech machine to try but it loses it's memory setting when timed out on 240v. I need something that keeps its timer cycle intact. Maybe an expert out there can help? Happy to modify something etc. Nick Tasmania
Question by tassie2 | last reply
Hi, I am a ME with very limited knowledge on electrical side of the world. I have ordered a electric motor from Germany with 240 V assuming it will be single phase. The motor has rocked up with 230 V winding but 3phase connections. Is there any chance I can connect this motor to our single phase supply??? Any device which will help to use this motor. Please help.
Question by NasirA9 | last reply
My LCD computer monitor normally runs on 240v (Australia) but it was running during a power “brown out”, so is it maybe passable to run it from 12v without opening it (Imeen power it via its mains power cable)? Or would a standard inverter work? And what kind would I need? Power info from back 100-240v~ 1.2A
Question by BlueSuneLIght | last reply
Hai... I need some solution... I'm not a electrical engineering... so, there are 5 unit of 3 phase wind turbine, with rate output up to 2Kw, 48V each... and I need to produce current load for home about 7Kw to 9Kw, 240V,,, so, how to wiring from 5 unit of wind turbine to home current...sorry for my english and thank you...
Topic by zeak1975 | last reply
Hi there I really hope someone can help. I want to install a campervan tap setup in my office (tu cut a long story short, I need the sink and running water and the building is too old and no plumber will work there for little money) and got a 12v water pump which I indent do connect to a tap and feed from a 20L water tank. This is the pump: http://www.trademe.co.nz/motors/boats-marine/parts-accessories/pumps-tanks/auction-1195429887.htm I got these details: Volts: 12V Nom. (9-14.4V) Amps: 3MAX (3.5A fuse required) My question is: Can I hook it up to a 12V 5A power adapter to it and simply plug it to the wall? This is the adapter I found: https://www.aliexpress.com/item/Power-Adapter-Supply-For-Led-Flexible-Tape-Light-AC110-220V-to-DC12V-1A-2A-3A-4A/32658402593.html?spm=2114.13010608.0.0.k9Mw96 I really hope someone can help as I'm useless with this stuff
Question by RacineO | last reply
I just got a 3 pin wall power socket (240volts/EU style) that comes 2 built in USB charging ports. I replaced my wall power socket with it and both the USB charging ports works fine and so does the power socket (when I connected my 240volt desk lamp to it). However, when I happened to make a call on my iPhone whilst it was charging (from one of the usb ports), there was a "tingling" sensation when I held the phone to my ear. This is a repeatable process... turn the switch off/disconnect from the USB port and the "tingling" goes away, turn it on/connect the phone to the USB port and the "tingling" is back again. There is obviously a grounding/current leakeage problem from this "Socket". I can't feel the "tingling" when the connected phone is being held in my hand. It is very apparent when the phone is held next to my ear. I have ascertained that the connection to the power socket is correct ie. Live, Neutral and Earth are all correctly wired. QUESTIONS: 1. Is there a way to detect this leakage other than only using my ear ? ( I need to show the manufacturer that this is a real problem either with a video or be able to measure this leakage objectively). Is there a electrical device /detector for this ? 2. How dangerous is this situation ... Could it have electrocuted my family ? 3. What is the cause of this ? Is it because of poor earthing/grounding in my house wiring ?
Question by teohes | last reply
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
My original laptop charger is not working can i use New charger whose input is 100-240v-2.4a (2.4a) 50-60hz and output 20v(20v)== 4.5a(4.5a) insted of my original cahrger whose input was 100-240v~1.7a 50-60hz and output was 20v(20v) == 3.24a(3.24a). As you see there is difference in input and output ampers
Question by AbdulR138 | last reply
I am trying to make the motor into a sander but I have no way to power it. I salvaged it from an old dishwasher. How would I ground it?I think I have 240V mains. The electric meter says 240V 3W TA=30. How would I know which wire is hot? The connection terminals are labeled N and LI or L1. I am in Oregon, USA.
Question by qwerty126 | last reply
After having several (like 4) thermostats fail in a 6-year period, it finally dawned on me to check the voltage from the transformer and I found it to be a bit over 28 volts. My condo building has 208V service. The transformer in my air handler is a 208/240V one and was wired to the 208V terminal. I removed the wire from the 208V terminal and connected it to the 240V terminal and then found the voltage to be 24.2V. So I have possibly solved the problem of the thermostats failing but my question is, will this cause any damage to the primary (or secondary) of the transformer? Thanks in advance!
Topic by kvander51 | last reply
I have a standard lamp that uses two separate 60w, 240v filament spotlight bulbs. What I want to do is convert it to using white leds or super bright white leds- one led disc to replace a bulb. What i need to know is: how many leds of this sort I would need to use on one led disk to produce the same amount of light as one of the above bulbs.
Question by mdog93 | last reply
Hi, I do not have technical knowledge but found this site and you guys. I need to convert a 1 RPH 240V 50Hz small motor so it will run off batteries. Want to make a modified casing to fit both into so ideally nothing very big. If batteries needs to be changed regular must last at least over the HOUR mark. Ideally would be rechargeable batteries (excuse my lack of knowledge, i don't know if that makes a difference) Would really appreciate your help and expertise on this one. Thanks
Question by iJaxx | last reply
I'm totally new to metal welding but am going to give it a try. My oven/range has a power outlet that reads on it: 125/250V, 50Amps. It has four prongs, three vertically oriented flat ones aligned as a triangle with the center one lower than the other two, and a fourth one top center that's round. My breaker box shows a 50Amp breaker for it. The welder says it's a MIG 170, 240V AC, 20Amps,single phase, 60Hz (Harbor Freight). I think the power I have is actually 220V but I'm not sure. If I do only have 220V will the welder only draw as much voltage as is asked by it - that is, if I only crank it up, say 3/4 of the way, will it draw less than its rated 240V? Or is that 240V just a maximum rating and it should run ok with 220V? It would seem odd that they would sell a welder that won't work for the power their customers would have by default without modifications. Also, where can I get a double socket for that outlet with one having an extension so I don't have to pull out my oven every time I need to weld something? Thank you. Bretina
Question by Bretina | last reply