I have a speaker with an embeded amplifier that uses 12VAC ~ 2.9A and want to connect to a 12VDC in my car, a simple bridge rectifier will do the trick converting the corrent?
Question by Salazar2 1 year ago | last reply 4 months ago
Greetings, I’m very new in electronics. I would like to connect my analog camera that uses 5v dc to my car battery. So I need your help to make a voltage converter. From what I have understand searching the web, I will be possible and very easy actually. All I would need is an opamp and some resistors?!!! Right? So any diagram or anything that you can help me with will be more than appreciated. Thank you for your time reading this. Best Regards P.S. I hope I’m in the right place writing this topic
Topic by toqilula 8 years ago | last reply 7 years ago
I'm building a circuit that would run off roughly 7v and convert it to 12v using the LM2577 (LINK). the datasheet (LINK) provides an example circuit that will output 12v @ 800mA. I need a little more power than that. around 1.25 A. my question is that if the 100mH inductor was replaced with a larger one. say a 150mH one, would that increase the current output? i would also replace the 680uF cap with a bigger one to reduce ripple. FYI the LM2577 is rated to convert 3.5v-40v to 12v. any information or direction would be appreciated picture is from the national semiconductor datasheet page 3
Question by stapler117 8 years ago | last reply 8 years ago
I have an Arduino project which drives a set of 12V LEDs using NPN transistors, I had been using the linear regulator on the Arduino to convert 12V to 5V for the Arduino and Ethernet shield, however I have some IL1205 DC-DC converters which could also be used, personally I think the IL1205s are the better option as they seem to dissipate less heat then the regulator on the board. Are there any other solutions to this, It would be ideal of I could power the entire project from a single 12V power supply, it also has to run continuously so must either produce little heat or be easy to dissipate the heat away from. Also because of the circuit I have to bridge the -Vin and -Vout terminals of the converter (for the transistors to work properly) I assume there is no problem in doing so. Any help is greatly appreciated. Thanks, Dan
Question by DanNixon 6 years ago | last reply 6 years ago
Hello all. i am currently working on an air powered rifle. my goal is for it to be self contained, so i took apart a testors airbrush compressor and i am fitting the compressor assembly to a 12v blower motor for an early 90s toyota 4runner. is there any way that i can make or purchase a 12v battery pack to power this thing?
Topic by dans89 8 years ago | last reply 6 years ago
Hi, I have a 12VDC fridge and am trying to convert a computer power box to supply power to it. I started with a ATX type and have problems with it resetting itself after the compressor restarts itself after reaching temp. I have a 10Watt resistor connected to the 5V wiring to keep it running during full temp switch off, but when frigde restarts itself the power supply resets. I am now trying a AT 230W box and it does not reset but under load I only get 10.4v, not enough to operate fridge for cooling. Any sugestions how to lift voltage as when connected to motherboard and 4 hdd's it generates 12v. Sorry I should add that the fridge is 12v 4.2amp and the power box is 12v 8amp. I have tied 2 x AT type boxes with same result. Thanks Tim Thanks
Question by timbont 9 years ago | last reply 8 years ago
I have an emergency lamp with backup battery power. its lamps have gone out. i want to use it to power a router, medai converter and a mobile charger. i have uploaded the specification of my power supply and things i want to run. please give me a detail way of doing this project and the materials i need, like inverter and other things My lamp gives 12V DC supply. i want to convert it to 220V AC and run those components. how can i run it and how long can i run thanks
Topic by energyworks 5 years ago | last reply 4 years ago
Hi Guys, I have a 15.6 volt dc motor taken out of a handheld vacuum cleaner. is this suitable to use in a small wind generator as a project with my kids. when i attach it to a power drill and spin it from the shaft i dont seem to get any power generation. If i connect it to a 12v battery is spins real fast. any help would be appreciated sam
Question by sam301 6 years ago | last reply 6 years ago
I am doing a science fair project that involves a solar panel, connected to a charge controller, connected to a 12V battery, connected to a switch system that can either go to a flywheel with a 12V DC motor or straight to a DC to AC inverter which leads to light standard light bulbs. The system worked (light bulbs lit) when I connected the panel to the controller to the battery to the inverter. However, when I had the battery power the flywheel and then have the flywheel output its energy to the inverter, the inverter shut down and would not work (red alarm went off). The flywheel is producing more than 10V (starts at about 11V) for at least 30 seconds, and the inverter's low voltage shut down in 10.5 plus or minus 5 volts. So why doesn't it work? Is the inverter messed up or is the flywheel outputing AC power? Also, when I connected the solar panel to the charge controller to the flywheel, the charge controller completely shut off. Are charge controllers not able to be directly linked to motors? And if I tried to directly connect the solar panel (which has 20V) to the flywheel (with a 12V motor), without a charge controller in between, what would happen?
Question by valmic 8 years ago | last reply 8 years ago
Why? So I can run a pile of 'pro' audio equipment on of a parade float without resorting to a generator or an off the shelf 120vac (barely) inverter. The equipment I'm talking about is a pair of 4 channel wireless mike receivers (8 mikes total) and a 10 channel mixer. Other input comes from an MP3 player or CD player. We also have an AM/FM/HD radio on board for those long waits in parade linup. The power amp is an automotive (12vdc) unit, 4 x 1000 watts. Main power is a pair of deep-cycle NAPA (optima clone) spiral cell batteries topped-off from the tow vehicle via a charge isolator. There is also an 35watt solar panel (again, for those long lineups) run through the charge isolator. The solar panel maintains the batteries while the float is parked or in storage. Cracking open the gear we have, every single one of them uses a 10:1 step down transformer to drop 120 vac line to 12vac before dumping it into the mainboard. It looks like 12vac @ 3 amps will do it for the wireless mike receivers and mixer, but why not shoot for 5 amps to be safe? Ideally, there would be some serious filtering and regulation/protection on the output. In a Perfect & Ideal world, there would be multiple 12vac outputs each capable of 2 or 3 amps and isolated from each other. Too much for a request? You never know if you don't ask. And, in advance, many thanks!
Topic by snoeclipse 9 years ago | last reply 9 years ago
I am trying to build a "knight rider" light for my car using 3w led's. I know enough that I want 2 per section (8 sections total) and to wire the led's in series. They will be mounted to an aluminum bar, so I might not need heatsinks. They will be controlled by a "chaser light" sequential controller. The specs are: yellow 3w led forward voltage: 2.9v - 3.3v forward current: 750 mA I have researched and found led drivers but they are a bit more expensive than I would like to pay, since I would need 8 of them. Can anyone help me with what I need for this to work on my 12v dc automobile? Do I need transistors, diodes? What resistors do I need (value, wattage, etc)? I need major help from the electronics gurus. How do I do this??? I posted this in the workshop section mistakenly yesterday.
Question by gizmo13 6 years ago | last reply 6 years ago
Hi, I want to make a UPS type of device for my tv box which takes 12V-2A power can anyone suggest how to build one I am not able to find any DIY to work with it and I would like to use that TV box as my little NAS device since it runs on windows. and to make it running even in power outages I need some type of UPS for it. regular UPS would convert 12-v to 230v and then 12v that seems a lot of power wastage. if anyone can suggest a better way to do it it would be a great help Thanks in advance.. Paras
Question by ParaskumarB 2 years ago | last reply 2 years ago
Hello I have a emergency light with battery back up. its lights have gone out so i want to use its 12V dc power to transfer to ac power to backup a media converter, wifi router and mobile charger. Please, i want a detailed process of building this system. how much time could i get backup? i need a instrument and parts list for this project. i have uploaded the pictures of my light and specifications along with it. thanks
Topic by energyworks 5 years ago | last reply 5 years ago
Hi guys. When you use solar panels and have gadgets with different voltage requirements that you want to power up. I need atleast 2 different outputs, 5v and 12v , so which is most efficient , 12/15v panels that you regulate to 5v , or 5v panels boosted to 12v? is there any general advantage in either case and i,m talking about using cheap ebay switch regulators / boost converters, not anything expensive hi tech. regards
Topic by kristerh 5 years ago | last reply 5 years ago
Hi im trying to build a wind turbine.The purpose of the wind turbine is to determine the maximum amount of power it can produce with different loads. It needs to produce at least two watts of power during testing, I tried using a potentiometer but it started smoking. I need to record voltage, current and power. I needed to know how to set this up, and if I can use resistors instead of a potentiometer. I have power supplydmmresistorsblade12V DCWires
Question by hj212121 19 days ago | last reply 18 days ago
Is there easy way to convert 12v to 24v.Found some circuit diagrams to increase voltage but dont know they are working. I brought a snail horn for my motorbike but it's sound very low. i know my motorbike battery is the reason for this, I need to increase voltage to make my motorbike horn louder. i'm currently testing 555 timer voltage doubler circuit on 123d circuits. You can simulate it here 555 timer voltage doubler Give me a straight answer for this..
Question by ishan udyoga 3 years ago | last reply 11 months ago
Hi friends i want to make electric heater that could give sufficient heat with 12 volt dc battery. how much nichrome wire in lenght should i use and how much gauge of nichrome wire should i use. i love for your kind replies. love u all
Question by waqas12345 1 year ago | last reply 1 year ago
Hello all2 Questions pleaseI am working on a hobby project and I am needing to hook a 12v computer fan (200mm) which is 0.3A max...up to a Turnigy 5.0 Li-Po battery. The battery is 7.4v, 30-40c discharge, 5000mAh. I have ordered a DC to DC adjustable voltage "step-up" converter to increase the output to 12v (I am hoping this works). (Q1) - how (if at all) do I limit the output amperage to 0.3A without burning up the fan motor.The fan is going into a cosplay set of foam armor (to help keep some air flow going to try to keep semi-cool) and I am hoping to be able to run the fan for about 3hrs. If I can accomplish the above, (Q2) - how long might the fan run?Attached is the "step-up" I ordered...
Question by Jeepguy001 4 months ago | last reply 4 months ago
Hi thanks for reading. I'm building (from the ground up) a set of 3x6" > Amplified 3 watt stereo Planar full-range speakers to be powered from a Cell Phone. I have most of the required parts which are many. One of the parts of the system I'm installing is a Blue LED (Amp On) Indicator. I'm running the system from a USB Charger or a Cell Phone USB Port at 5.5 volts. I went forward and ordered the Blue LED's and they haven't arrived yet so I can't test. These LED's are from E bay with little info of course. They are said to be standard, Blue 2mm 12 volt LED's. (Not Ultrabright) ------------------------------------------------------------------------------------------------------- My question to you who may know: Are (Rated) 12 volt LED's likely to light from a 5.5 volt power supply? I guess my confusion is between the 12v claim and the LED Color Standards for a Blue LED.. ------------------------------------------------------------------------------------------------------- Without knowing the complete situation, here is the resistor value I've been able to come up with based on *LED Color Standards (Blue) and Supplied Power (5.5v): (*Blue) LED calculator: Current limiting resistor value: Source voltage = 5.5v LED voltage drop = *3.5 LED forward current = *20mA (=) Current-limiting resistor needs to drop 2 Volts. The resistor value is 100 Ohms, the next higher standard value resistor is 120 Ohm. The resistor will have to dissipate 0.04 Watts, the resistor should be rated 0.067 Watts, a 1/8 Watt resistor should do it. Final: 120 Ohm, 1/8 Watt. (color code: brown red brown, Silver). (100 Ohm: Brown, Black, Brown, Gold). ------------------------------------------------------------------------------------------------------- Thanks for the help! I hope I made some sense here ;)
Topic by Rexrich 3 years ago | last reply 3 years ago
So I have a black wire and a white wire coming in to where I have to hook up this LED transformer I know this is 110v. I saw the circuit breaker and it was double pole so I assumed it would be a 220v I ordered a transformer that could handle 110 and 220 but the colors are different. Is the transformer shown meant to have input wires connected to the hot? which ones to I put where? What goes to white here and what goes to black?
Topic by seanrforrest 4 years ago | last reply 4 years ago
Question by LeShane 7 years ago | last reply 2 years ago
I need to create a circuit with two different output voltages but with a single input voltage. The output voltage must be 5v and 12v dc. The input voltage must be max 12v dc (for using 12v dc power adapter from ac mains).
Question by akki5230 4 years ago | last reply 4 years ago
I want to build a 6-12v dc converter so I can use a CB or FM radio in an antique car (1930). The car uses 6v positive ground power. There are small commercial units available for about $100 but there's got to be a less expensive alternative. Thanks!
Question by beast_3 8 years ago | last reply 8 years ago
Question by ameerali 7 years ago | last reply 2 years ago
I have a 12V AC power block powering some lights, I want to take one channel off that block and power a 12V DC strip of LEDs, could I just use pretty much any single phase bridge rectifier? They all seem to be rated in the 100's of volts... I know I could do the same thing with a bunch of diodes, a zener and a resistor, but I'd like to just use a packaged chip (because I'm lazy...)?
Question by csavage6 6 years ago | last reply 5 years ago
Hello. i have an LCD monitor powered from AC, that i want to make to be powered by DC for use in my car. the monitor PSU , supplies the controller with +5v and +14.5v. and i want to power the monitor from a regulated 12v psu. my question is, how would i make a dc booster, from 12v to 14.5 v at 2 ampere? thanks in advance!!
Question by settra 5 years ago | last reply 5 years ago
Hi all,I need help with a solar power I purchased from Ebay. I've been looking for a solution to this everywhere but I couldn't find anything and the ebay sellers support isn't that good.the solar charger is this: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ih;=020&sspagename;=STRK%3AMEWN%3AIT&viewitem;=&item;=300109488427&rd;=1&rd;=1and alsohttp://www.powerinverter-kr.com/wbyy/imgs/12W_12V.gifThis is a 12V solar panel. Does anyone know any device that can convert this 12v to 5v?I'm also confused about the Working voltage" "open voltage" this solar panel is 1. Voc: 19-21V2. Vop: 14.5V 3. Current: 0.7-0.8AI'm looking for ways to use this to charge my pocket pc which is Dell Axim and accepts 5V input. Is there anyway to use this device to charge dell axim? The plug from the solar charger is a basic fork which accepts different tips as seen on the page.. I'm looking to come up with a solution that'll let me change the voltage from 12v to 9v, 7v, 5v and on.
Topic by turgan 11 years ago | last reply 11 years ago
Hi all! I am currently designing a simple electronic device which uses Arduino-software. It needs to be connected to a car (Lead-Acid) battery of 12V and be stepped down to 5V for my ATmega328 to be powered. I read that I must use a "Standard 7805 5V regulator" for this. My question is, will it be able to cope with the heat? Must I put a heat-sink on it and/or is the regulator even "big" enough for this? I figured that using two regulators in parallel, might halve the current and help prevent over-heating. (http://www.sparkfun.com/products/107) Another thing is, how could I go ahead and setup a small NiMH battery charger for this device which works like this: It runs of the car battery at all times and keeps the backup NiMH battery fully charged - as soon as the car battery gets disconnected, it switches over to the NiMH cells. (I will be using 4 of these for my backup-battery-pack http://www.sparkfun.com/products/335) See my attached schematic of what I have in mind, please tell me what you think about it. I have too little knowledge of electronics to solve this problem myself, but if you can point me in the right direction at least, I will try and figure it out from there. Thank you for your time!
Topic by louwhopley 7 years ago | last reply 5 years ago
I am trying to use a 12V LED light string for lighting in a bus conversion. The LED string is 12V, but comes with a AC/DC adaptor so it is intended to be plugged in to an AC outlet...however, I want to connect it directly to the bus/RV's 12V DC electrical system. I'd planned to just use a DC connector to replace the power adaptor and connect directly to the 12V circuit/wiring...but I think I need to regulate the amperage going in to the LED string. ?? I am not sure what to use to regulate the current of that circuit. I've read about LED drivers, but most seem to be AC/DC...and I want DC/DC. Also, the constant current drivers don't seem to match up to the current the light string would require if I assume the power adaptor is supplying the correct amperage. Help? The LED light string does not state many specs, except that it is 12V / 6W and uses 100 micro/fairy LEDs. The AC/DC power adaptor that comes with it says the output is 12V/1A, therefore I assume I need to regulate the amperage to 1A...but wanted to confirm with someone more knowledgeable than me. The RV electrical system is composed of a 440AH battery bank and from what I've read about LED's I can't just wire it into a circuit fed by that much potential current, even if it's fuse protected at the DC distribution panel. Any suggestions?
Question by DSHobbs 2 years ago | last reply 2 years ago
This might sound stupid, but I was watching some guys build batteries to Electrical Cars using Laptop batteries like Tesla does (18650 battery Cells) and I got thinking about creating an UPS for my PC. If Im not mistaken, most UPS convert AC to DC current and in a mains power loss they convert back DC to AC which is not very efficient I assume. So why not instead of going thru that process, why not power the PC components directly from the UPS in the event of a power loss or power supply failure?? My idea was to build a UPS that works completely on DC power, from its input to its output. So the PC power supply would charge it and the UPS would power the PC components in case of a power failure. I would be using this on a server so I dont need monitors or other stuff. All that would be require would be power regulators for 12V, 5V and 3.3V right? Wouldn't that be more efficient? (the battery would last longer due to less power loss on conversions I think) And wouldn't it be cheaper? Thanks, Ralms
Question by RicardoM146 3 years ago | last reply 3 years ago
My WiFi ISP signals were unable to reach my room. So my ISP arranged a device on top of apartment & it was powered with 12 volts DC adapter. But makes me to work offline when power is OFF. So i want to make that device to work on 12V battery. So i need to make a charger for that battery to work as UPS. Can any one help me with circuit Diagram and components list??
Question by chinnuabhi 7 years ago | last reply 7 years ago
I need to power a 12v dc Digital Photo frame in an interior area with no available plugs. I can charge it at night, but need it to be self powered during the day. What can I use as power? I was thinking of possibly a Computer battery back-up or a portable battery used for jump starting a car. Any and all ideas would be helpful. Basically making a battery powered digital sign board. Thank you!
Question by larry925 3 years ago | last reply 3 years ago
I am building an AC to DC power supply based on several Ibles and I am not sure I understand what the 2 different voltages are (-12v, +12v; -5v, +5v ....) Thank You!
Question by missplumeau 9 years ago | last reply 6 years ago
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 8 years ago | last reply 8 years ago
Hello, I want to connect a portable solar powered rechargeable to 2 DC fans of 12v to cool my car. 1. I have 2 options of portable solar powered: (A) 1500mAh, outputs: 5.5V / 800mA (B) 2000mAh, outputs: 5V 500mA which one is preffered to connect to those PC fans? 2. most of the PC fans are working at 12v. I don't quite sure if I'll build simple 5v to 12v regulator it will works and produce enough airflow. Thanks.
Topic by ashakif 7 years ago | last reply 6 months ago
I went to a pick-a-part car parts for 12v DC motors, there were a lot of them, and I found four 12v 11k DC motors from a 1991 Toyota Cressida for really cheep (almost free) :) . Google has been no help in finding the specs for the motors, Im just at a loss and I don't want to just hook them up to a car battery that would be way to many amps and is most likely going to brake the motor in the process. so how do i find out the specs of these motors manually?
Question by jwflammer 8 years ago | last reply 8 years ago
Ok kind of a noob question .. so im running 4 12v dc fans using .28 A current in Parallel with an adaptor that outputs 12V with .3 A current. my question is, will i need to add something (resistor or w/e) to limit the current so my fans dont fry or will i be ok with nothing?.. i also want the voltage to remain at 12V , because i need them running at full I searched the forums, couldn't find any specific answer Thanks for your help!! -Chris
Topic by cholborn 7 years ago | last reply 7 years ago
So I have this idea that will require a fog machine, some LED's, and a switch to turn them both on at the same time. The mechanical issues I have figured out, I just need a little help with the electronics. I plan to have this rig be mobile, as in backpack mounted, and I have no problem carrying a 12 volt battery on my back to accomplish this task. I need help on the specific electronics required in order to rig it together. To the best of my understanding, I need a 12 volt battery, an inverter/power outlet, and POSSIBLY a microcontroller, but I'd like to avoid the later at all costs, haha. Fog machine I intend to use would be 400 watt since it seems to be the most viable. If I can swing a KW one that would be awesome. And the LEDs would be either red or blue. I'd like a switch in the set up to allow for the fog/LEDs to be activated at the same time. URL to machine below: http://www.walmart.com/ip/Fog-Machine-400w/12335927 What I really need to know is how to set up the 12v to accept the 400w fog machine, if it's possible, and what type of gauge wire/cooling systems I would need if I chose to run this on my back for safety. And if you could help with the logistics of recharging the battery, that would be sweet as well. Thanks!
Topic by ItalianLou 7 years ago | last reply 6 years ago
Question by Marv2402 6 years ago | last reply 6 years ago
Hi, Im looking for schematics for a Chicago electric - 2000 Watt / 4000 Watt Peak Power inverter part number 95596 from harbor frieght. i did search there site with no luck, and i could use it asap. Or if you some advice about how I should go about repairing it, that would be great. It simply will not power on. TY in advance for your help :)
Topic by intheshed123 8 years ago