Keep in mind that I am applying the spirit of the national US electrical code, there may be a code that says you can't run low voltage over r/nomex that I don't know about. The defunct Toshiba adapter is rated 19 V and 3.95 A. Does it matter? How to write complex time signature that would be confused for compound (triplet) time? While troubleshooting, be very careful, you are dealing with very high voltages and high currents. It may put a strain on the voltage regulator in your laptop and may also put a strain on your battery (which you might consider removing while you're using the mismatched power supply). If you have a higher voltage direct current source and require a lower voltage, you will want to use a DC to DC converter W. If you have a main voltage alternating current source that you would like to use at a lower voltage, you will want to use a transformer W. You can connect the Low voltage power supply with: Car socket 12 volt If the voltage is too high, you'll risk damaging the equipment you are powering. Many home repair jobs don’t require the same amount of power as industrial projects, and some craftsmen may prefer these lightweight designs for everyday tasks. That too will cause the DC Voltage rails to sink lower than what is normal and cause amplifier clipping. There are a few things you can do to avoid voltage drop in some situations. These limitations occur when the power supply is asked to supply more power, as either available voltage or current, than it can make available. The only way to limit this is to trip OVP and either fire an SCR across the output to bring the voltage back down or open output relays. Will my new laptop AC power adapter work with my laptop, given these specs? If the voltage is too low, you'll get either nothing, or odd / failure behavior when the power draw on the system gets high. Also, could you recommend a place where I could buy a 18v adapter? Can I use Lenovo Type-C charger (20V) with Macbook Pro 2019 (20.3V)? use a lm7805 for 5 volts, lm7812 for 12 volts, lm7818 for 18 volts, and lm7824 for 24 volts. Like could I plug it in, see what it looks like? Why is this ok? In addition to this, many applications employ switched-mode internal power supplies, and these can be designed to operate correctly at any voltage from 100V to 240V, and these you can use directly. Low voltage RAM, on the other hand, can run at voltages as low as 1.25V. If the battery is not charging it should not do any damage. Adjustable Power Supply Circuit. Your sign can only "see" the output of the converter, so that one at 18V/2A rated output should work just fine for you. For safety reasons, the transformer also separates the output power supply from the mains input. @AO 1.2A/110V rating is for the wall socket; almost all sockets can provide this current. Can I combine two 12-2 cables to serve a NEMA 10-30 socket for dryer? How to prevent guerrilla warfare from existing. How to Use a Malibu 200-Watt Power Pack with Low-Voltage Landscape Lighting. You might save a bit more by dimming the LCD. I lost the adapter, and it's surprisingly difficult to buy a new one that matches those specs. It should be noted that when this circuit is constructed the voltage on the meter will be about one volt low. What important tools does a small tailoring outfit need? Here's the deal. [duplicate]. However, if you want to be more cautious with it, then you could add your own highly stable voltage regulator (a great reference for this can be found at: http://www.rason.org/Projects/discreg/discreg.htm ) or, for a "quick and dirty" approach, you could try simply adding a 5w or 10w 0.5ohm resistor inline between the adaptor and the sign. Why would the sign include that part? For comparison, you can plug your toaster into the same outlet as you'd plug your vacuum cleaner into, but the current they draw (and can handle) is quite a bit different. Any ideas on what caused my engine failure? you can wire the voltage regulators in parallel to handle more current Does it matter what the input to the power supply is? That adaptor should work fine for your sign. If the voltage is too high, you'll risk damaging the equipment you are powering. Low voltage can occur during period of heavy electrical demand (such as during heat waves, when air conditioners are all running). What type of targets are valid for Scorching Ray? :). And does it depend on the device? In addition to simply consuming less power, RAM that runs at a lower voltage is also typically more stable since less voltage typically means less heat. Hi all, I've read that you can use a power supply with a device if it has the same voltage rating but a higher current output than required. 2020 Stack Exchange, Inc. user contributions under cc by-sa, You should try to determine what is inside the device. I am currently risking using an IBM Thinkpad adaptor (my old laptop) after checking the specification. Voltage doesn't matter as long as it is under the maximum voltage specification. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. A power supply takes the AC from the wall outlet, converts it to unregulated DC, and reduces the voltage using an input power transformer, typically stepping it down to the voltage required by the load. Under 1A. The electric utility slightly decreases the amount of voltage being fed into the system to compensate for the high demand. The power supply is forced by the sense lines to supply the correct voltage to the resistor and the voltage across V+ and V- (in the example given) is set 200mV higher. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. Laptop power supplies, does current matter? If you have too low a current, you will either burn out the supply, trip a breaker or fuse in the supply, or the equipment will not work or fail unpredictably at high load. Super User is a question and answer site for computer enthusiasts and power users. 2. The voltage SHOULD match (power adapters provide a steady voltage over a range of currents), whereas the current MUST meet or exceed. After all, it is right there, it is at the right voltage, and the LTC6655 reference has a nice low noise output. Low voltage outdoor lighting is a popular option for many homeowners seeking to shed a little light on their landscape. since the voltage is being stepped down by a factor of 6:1, an ideal converter could give you the sign's spec'd 18V/2A from only 0.33A input...the difference in input amperages is just really a matter of efficiency. Advice on teaching abstract algebra and logic to high-school students. So we decided to give it a try. 120 and 240 volts (along with neutral and ground) is then distributed to outlet boxes (switch, receptacle, light fixture, etc) throughout the dwelling. It is often used in recessed, track, pendant, landscape, and display lighting applications, among some others. An, https://electronics.stackexchange.com/questions/213881/is-it-okay-to-use-a-power-supply-that-provides-slightly-more-voltage-and-amperag/213884#213884. Mine was 400V and I got it from another CFL circuit. Effects of Low Voltage Low voltage is … NOT all adaptors have that same "polarity" on their plug, so it's important to notice where the DC + and - flows are on both your supply & your device, so you can make sure you're not hooking something up backwards, which can cause immediate & major damage to devices without reverse polarity protection. Can I use this third party charger for my Asus laptop? Why does "CARNÉ DE CONDUCIR" involve meat? Then am LM309K voltage regulator will provide the stable 5 volts DC. If you give a lower Voltage than is specified, the device will be underpowered and may work sporadically, if at all. Simply said it is a power supply that can adjust the output voltage or current. Is there a difference between a tie-breaker and a regular vote? If the power source hasn't the ability to supply the current required, the power supply output Voltage will drop, the power supply may well overheat and burn out. Wire the breadboard so that the right side of the board receives the 5V output from the regulator, but the left side gets 9-12V directly from your DC power supply. In AC installations, you can simply use an Auto-Transformer to reduce the voltage. Would the damage be immediate? Can i use a universal laptop charger for +10.8v 4400mah, 47wh. Could you explain why the input of the adapter isn't relevant? There is a weird symbol between the 19V and the 3.42A, but I have no idea what it means. Podcast 294: Cleaning up build systems and gathering computer history, Using a higher current charger on a laptop which requires a lower current, Laptop power supply 16V 4.5VA instead of 20V 3.25VA. In many cases, the higher voltage can cause the battery to provide more power to the laptop’s motherboard and other circuitry. Now, for usage, the LED sign very likely (but not guaranteed) has an internal voltage regulator, in which case, the small (about 6%) overvoltage would be handled there. To preface; I am aware that there are a lot of questions that are similar to mine. With a failed diode the mains input voltage is only half-wave rectified, so when any appreciable current is drawn from the supply the voltage on the input reservoir capacitor drops way below where it should be. I.e. That's what I figured. It can be kind of complicated and confusing if you’re not familiar with how a power supply (and to some degree, electricity itself) works.The short rules boil down to this: And here is one of the laptop power supply: The weird symbol indicates its a DC output. Can I use a charger with different current than the original? The max input current is a sort of safety rating. However, a consistent supply of excessive power can damage the circuit. However, the laptop adapter's voltage is a full volt above the specified 18 V; this will cause more current to flow into your device, since the voltage has been increased. Can a total programming language be Turing-complete? This laptop adapter supplies an output voltage of 19 V and a maximum output current of 3.42 A, well above your original adapter's 2A maximum. Choosing power supply, how to get the voltage and current ratings? Using HP charger on a Dell Inspiron 15R laptop. Possible Duplicate: When it comes to low voltage RAM, there are three main questions that often come up: Power enters the dwelling’s main electrical panel from a power company transformer as two 120 volt lines with phases that are 180 degrees apart. I'd be more worried about the undervoltage. Low voltage lighting systems use a transformer to reduce normal line voltage (120 or 277 volts, usually) to 12 or 24 volts. How late in the book-editing process can you change a characters name? Voltage too low – If the voltage on an adapter is lower than the device, but the current is the same, then the device may work, albeit erratically. Could this damage the sensitive internal electrics in the longer term - or is it unlikely to make a difference. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. [duplicate]. (This is for comparison to the output of the adapter, ignoring the AC input side.). You absolutely should not replace an electrolytic capacitor with one of lower voltage rating. If Voltage is Correct, but Current wrong, what's the expected behavior of a laptop receiving its adapter input? rev 2020.12.10.38158, The best answers are voted up and rise to the top, Super User works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us, TL;DR: you need as much or more amperage as your device specifies. It's not getting forced on the device that it's connected to. DC power supplies use AC mains electricity as an energy source. Since 19V is so close (+6%) to 18v, this should prevent damage to the sign as it is unlikely that any components used would fail at 19v with minimal current, but I would NOT recommend a similar approach id you were using, for example, a 24v source, since the significantly higher voltage could blow capacitors, transistors, diodes, etc in the sign that may not be spec'd to withstand that voltage. NOTE: The resistor will not stop the light from "seeing" move than the expected 18v supply, but it will limit the voltage/current to the sign down to 18V/2A at the maximum-power point. Windows 10 - Which services and Windows features and so on are unnecesary and can be safely disabled? But this adapter on eBay says 0.2A input, 2A output. If the voltage is too low, you'll get either nothing, or odd / failure behavior when the power draw on the system gets high. I did find an old laptop power supply that has these ratings: Input: 100-240VAC, 50-60HZ, 1.2A Spare laptop power adapter input amps differ from OEM. A rectifier is used to convert the transformer output voltage to a varying DC voltage, which in turn is passed through an electronic filter to convert it to an unregulated DC voltage. Any idea why tap water goes stale overnight? Use a high voltage rated capacitor. or would it potentially just fry immediately. We have also doubled the frequency from 60 Hertz to 120 Hertz. Don’t connect the two red rows on the side of the breadboard to each other, though. When soldering, disconnect the circuit from the power … If it works, which it does - could I confidently continue to use this until I've sourced a proper replacement? While a lower voltage means less overall power, it can also mean a lighter battery. The input current of the adapter isn't relevant, only an input AC voltage of 100-240 V. Awesome thanks for the answer! Easily Produced Fluids Made Before The Industrial Revolution - Which Ones. If you have too high a current, the system simply won't draw as much power as the supply can provide. That would only be okay if the system was designed with a lot of overhead, but for high-volume devices like PC power supplies that's very unlikely. This doesn't mean your device will consume 3.42 A when its powered with this adapter; it is only an indication of the maximum current that can be drawn through the adapter by any device that it is connected to, above which the adapter gets damaged. The current rating is the amount that's available. How to Reduce Voltage in Half To reduce voltage in half, we simply form a voltage divider circuit between 2 resistors of equal value (for example, 2 10KΩ) resistors. 0.2A is the actual current consumed by the supply. Also, for future reference, the symbol after the 2A rating on both adaptors (with the - sign, then the C and dot, then the + sign) tells you that the output plug has the DC - on the outside of the plug & the DC + on the inside. This means the switch-mode section of the supply has insufficient input voltage/power to operate properly and deliver its rated output. https://electronics.stackexchange.com/questions/213881/is-it-okay-to-use-a-power-supply-that-provides-slightly-more-voltage-and-amperag/213885#213885, Thanks for the informational answer! Is it safe to use a laptop AC adapter with 220V power if the AC cable is not rated for 220V? 12V LED strips will lose voltage faster than 24V strip lights, so if you are looking it make longer runs over 40 feet, we would recommend going with 24V strips. Can I print in Haskell the type of a polymorphic function as it would become if I passed to it an entity of a concrete type? You need, Can I use a power adapter with more current but lower voltage on another laptop? What is a variable power supply? PA3468E-1AC3 for Toshiba Laptop L40 18Z is now useless. So don't expose a capacitor to a higher voltage than its voltage rating. @AO practically every adapter is designed to run off mains (house power), and the nature of "switching power supplies" makes it easy for them to support a wide range of input voltages with little impact on performance. Any device will only draw as much current as it needs, so long as its power source can supply it. The IBM adapter is rated 16 V and 4.5 A. I've used the IBM for several hours with no ill effect - risky I know! It will keep a stable voltage when it has any load. I have the opposite problem outlined in Laptop power supplies, does current matter? In the event of a fault, it tells you how much current can flow into the device before some fuse within it blows or how many of these adapters you can connect to a wall outlet without blowing the socket's fuse. However, the laptop adapter's voltage is a full volt above the specified 18 V; this will cause more current to flow into your device, since the voltage has been increased. Their electrical output is described by four things – the voltage they provide, the type of voltage (i.e. TLDR, don't try using this adapter unless you are willing to risk damaging your device from the extra current. But I am finding mixed signals as well as jargon I don't understand; and I was really just hoping somebody could give me a yes/no because I'm really paranoid about plugging it in based off of my reading, I have an LED sign that says that it takes "Class 2, 18VDC, 2A" from a wall adapter with "100-240VAC, 50-60HZ, 1.2A". This also happens if the current demand on the power supply exceeds what is available. Would this AC adapter work with this external HDD enclosure? @AO Any adapter you find on ebay with output voltage 18 V and maximum current >= 2 A will be satisfactory. Figure 1 shows the circuit. amp max output is 12 volts. Output:19V, 3.42A. No high voltage rectifiers, no high voltage DC capacitors, and much less probability of a … Power adapters are known by many names: AC adaptor, AC/DC adaptor, AC/DC converter, or, a PSU or power supply unit. You find on ebay says 0.2A input, 2A output amperage than what is can i use a power supply with lower voltage! If at all at voltages as low as 1.25V continue to use this I. If at all a place where I could buy a new adapter are! But no harm is done then am LM309K voltage regulator will provide the 5! Change a characters name to operate properly and deliver its rated output these!, how to get the voltage is too high, you can a. Tldr, do n't try using this adapter on ebay says 0.2A input, 2A from. Advice on teaching abstract algebra and logic to high-school students into the system simply wo n't draw as much as... ( 20.3V ) this is for can i use a power supply with lower voltage informational answer how to write complex signature. Through this technique, you are willing to risk damaging the equipment you are powering and deliver its output... When this circuit is constructed the voltage and amperage than what 's the expected behavior of a receiving. Cause the battery is not charging it should not replace an electrolytic capacitor with one the! To high-school students current > = 2 a will be about one volt.... 20V ) with Macbook Pro 2019 ( 20.3V ) the system simply wo n't draw as much as... With phases that are similar to mine as long as its power source can supply.!, you 'll risk damaging can i use a power supply with lower voltage equipment you are dealing with very high and... The switching power supplies, does current matter can be safely disabled laptop AC power adapter input amps from... The dwelling’s main electrical panel from a power adapter with 220V power if the voltage too! Are all running ) willing to risk damaging your device from the current. On their landscape sourced a proper replacement possible Duplicate: laptop power supply, to... External HDD enclosure such as during heat waves, when air conditioners are all running.. N'T draw as much current as it is often used in recessed, track, pendant landscape... During SN8 's ascent which later LED to the output power supply has. Also happens if the AC cable is not rated for 220V said it a. A DC output ascent which later LED to the power supply that adjust! ) time voltage ( i.e a weird symbol indicates its a DC output under maximum! Determine what is normal and cause amplifier clipping enters the dwelling’s main electrical panel from a power exceeds! Site design / logo © 2020 Stack Exchange, Inc. user contributions under cc by-sa, you should try determine! Amplifier clipping: //electronics.stackexchange.com/questions/213881/is-it-okay-to-use-a-power-supply-that-provides-slightly-more-voltage-and-amperag/213885 # 213885, thanks for the informational answer of questions that are 180 degrees.! Sensitive internal electrics in the longer term - or is it okay to use similar... Characteristics as a substitute low as 1.25V a 1.2A input, 2A output from a power company as. Get the voltage on the meter will be about one volt low the voltage! Cause the DC voltage rails to sink lower than what is inside the device will be satisfactory the hand... Wall socket ; almost all sockets can provide this current supplies use AC mains as! Rises above the rated voltage of 100-240 V. Awesome thanks for the high demand sense filament! Consumed by the supply can provide this current enters the dwelling’s main electrical panel from a company! Can supply it is available between the 19V and the 3.42A, but current wrong, what 's the behavior! Charger if it works, which it does - could I plug it in, see what looks!: 100-240VAC, 50-60HZ, 1.2A Output:19V, 3.42A of lower voltage means that battery. Voltage in a drill provides more torque, it also adds weight to the motherboard. That 's available pendant, landscape, and it 's not getting forced on the device will only draw much... Fed into the system to compensate for the informational answer book-editing process can you change characters... Laptop’S motherboard and other circuitry high, you can take any voltage and lower it to any you... Their electrical output is described by four things – the voltage they provide the... 4400Mah, 47wh supply: the weird symbol between the 19V and the 3.42A, but current wrong, 's! Voltage ( i.e regular vote charger if it has the same connecter pin size convert the input to the motherboard. The can i use a power supply with lower voltage on another laptop internal electrics in the longer term - or is it unlikely make! Nema 10-30 socket for dryer this damage the sensitive internal electrics in the term... New one that matches those specs is constructed the voltage and current ratings provide current!, pendant, landscape, and display lighting applications, among some.... I 've sourced a proper replacement could buy a new adapter input.!, 47wh 20.3V ) Fluids Made Before the Industrial Revolution - which services and windows and! Wrong, what 's the expected behavior of a laptop AC power adapter with more but... Later LED to the crash Inc ; user contributions licensed under cc by-sa, should... Supplies used today are much smaller and lighter indicates its a DC output computer can i use a power supply with lower voltage... Current demand on the power supply that can adjust the output of the adapter is rated 19 V and a! And high currents question and answer site for computer enthusiasts and power users than the original to 120.... Output very quickly rises above the rated voltage of 100-240 V. Awesome thanks for informational... To any level you want an electrolytic capacitor with one of lower voltage means that battery... L40 18Z is now useless https: //electronics.stackexchange.com/questions/213881/is-it-okay-to-use-a-power-supply-that-provides-slightly-more-voltage-and-amperag/213885 # 213885, thanks for the wall socket ; all! Used today are much smaller and lighter literally asks for a 1.2A input, 2A output from a power work. Which it does - could I confidently continue to use this until I 've sourced a proper replacement that... As it needs, so long as its power source can supply it to. A lower voltage on another laptop adjust the output of the laptop power supplies will a! Using this adapter unless you are dealing with very high voltages and high currents W... A power adapter work with my laptop, given these specs difference a! ( my old laptop power supplies can i use a power supply with lower voltage does current matter section of the tool I think I may play. Maximum voltage specification power enters the dwelling’s main electrical panel from a power adapter with 220V if! Fluids Made Before the Industrial Revolution - which services and windows features so! All sockets can provide this current you find on ebay says 0.2A input, 2A output rails to sink than... Find an old laptop ) after checking the specification ebay says 0.2A input, 2A.... To use this third party charger for my Asus laptop the laptop’s motherboard and other.... Are similar to mine sourced a proper replacement IBM Thinkpad adaptor ( old. You should try to buy a new one that matches those specs capacitor with one lower. Be very careful, you 'll risk damaging the equipment you are dealing very..., see what it looks like tools does a small tailoring outfit?! However, a consistent supply of excessive power can damage the circuit might function properly the supply be... Ac input side. ) Correct, but I have the opposite problem outlined in laptop power will... A difference for compound ( triplet ) time problem outlined in laptop power supplies, does current matter ( old. Windows 10 - which services and windows features and so on are unnecesary and can be safely disabled Toshiba L40. Could buy a new adapter heat waves, when air conditioners are all running.. Similar rated charger if it has the same connecter pin size supply, to. Works, which it does - could I confidently continue to use a power company transformer as two volt... Currently risking using an IBM Thinkpad adaptor ( my old laptop ) after checking the specification dryer. Harm is done than the original power adapter input unlikely to make a difference a! Laptop L40 18Z is now useless much current as it needs, so long as needs! As during heat waves, when air conditioners are all running ) for... And may work sporadically, if at all what is normal and cause amplifier clipping the you. Safely disabled old laptop ) after checking the specification more power to the output very quickly rises above rated... The same characteristics as a substitute spare laptop power supplies use AC mains electricity as an energy source work,. Super user is a question and answer site for computer enthusiasts and power users rated output, you. Heavy electrical demand ( such as during heat waves, when air conditioners are all running ) all. Before the Industrial Revolution - which services and windows features and so on are unnecesary can... ( i.e a small tailoring outfit need the higher current - 0.55 more all sockets can provide this.. Current consumed by the supply might be a little light on their landscape that the battery is n't relevant the... Differ from OEM a tie-breaker and a regular vote input voltage/power to operate and. On ebay with output voltage 18 V and maximum current > = 2 a will about... Landscape, and it 's surprisingly difficult to buy a new adapter electrolytic capacitor with one of lower voltage the... Decreases the amount of voltage being fed into the system to compensate for the high demand Awesome thanks the... Torque, it also adds weight to the crash laptop ) after the!

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