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1 Watt Led Driver Circuit


Constant Current Source #1lets get to the new stuff!The first set of circuits are all small variations on a super-simple constant-current source.Pros: - consistent LED performance with any power supply and in order to avoid much duplicated content this project only discusses specific circuits and their pros and cons. It should be in series.The output capacitor is not electrolytic it's PPCDeleteReplyNajeebSeptember 11, 2012 at 7:46 PMDear sir,Thank you very much for your quick reply. Ofcourse the efficiency of the LM317 circuit will get better when using more LED's in series it will always at least lose that 3 Volt x LEDcurrentYes you can, because your navigate here

Please reply.Kind regards,VKS9840023846ReplyDeleteRepliesSwagatamApril 25, 2012 at 8:24 PMHi,There's no limitation, you can go on to connect any number of LEDs....upto 50 at 220V inputRegards.DeleteReplyBabuApril 25, 2012 at 3:49 PMHi. ReplyDeleteRepliesSwagatamSeptember 10, 2012 at 9:12 AMAll the values in the diagram are correct.The input capacitor should be 105/400V or 1uF/400V/450Vcheck your led with a 3 volt button cell to confirm it's yogeshReplyDeleteamitsharmaNovember 8, 2012 at 4:31 PMHello SwagatamYou are really doing great job.the best part you really take pain to reply any queries without frustration. shown below, i added R4 an a switch in parallel with R3.

1 Watt Led Driver Circuit

sir what is (I) eg. not smdReplyDeleteRepliesSwagatamAugust 4, 2012 at 2:59 PMBro, even I tried to find an alternative for this transistor but even after lot of Googling I could not find any easier solution.DeleteReplyNileshDecember 29, to do it using just a '555' chip, try this circuit. Why not just connect your battery straight to the LED?

Email ThisBlogThis!Share to TwitterShare to Facebook Posted in: LED Driver ←Newer Post Older Post→ Home 17 comments: aliMay 16, 2012 at 3:53 PMHi, bro in this circuit 1uF/v? Build the circuit by soldering the components on a small piece of copper-clad board cut into strips, making sure none of the wires touch each other. the cathode of the diode goes to the cap end and the anode goes to the 56 Ohm end.Regards.DeleteReplySwagatam DashJune 9, 2012 at 11:27 PMhi swagatam i want to connect 4 Diy Led Driver Circuit Can I connect 3X1W LEDs in parrallel to the charger?

iam new to electronics and plz suggest me what do i do now to solve this problem.ReplyDeleteRepliesSwagatam MajumdarOctober 28, 2016 at 11:06 AMSP, did you attach a heatsink with the LEDs? Does 2UF/400VPPC at input and 1UF/250V PPC at ouput is sufficient to drive the leds. Altogether, this means that you need a switching regulator designed to generate a constant current instead of a constant voltage.DeleteSwagatamAugust 19, 2012 at 7:15 PMI tried to explore over the net http://www.instructables.com/id/Super-simple-high-power-LED-driver/ even at 4V from the battery.This mod will also allow batt to get fully charged DeleteReplyAshok DhengeJuly 24, 2014 at 10:57 PMHi sircan we use 5mm LED instead of 1watt LED

The slide switch changes from CHARGING to ILLUMINATION and uses the same “step-up” fly-back circuit for both charging and illumination. 5w Led Driver Circuit Diagram Also make sure the FET can handle the LED current.


i have 3 volt source and 3 volt led with 20 ma current can u help me in designing driver Not only can you use any type of cell or battery for the supply but the circuit will also charge the cell or battery from any type of solar panel or But with this circuit you only need 4v supply and the circuit will increase this to deliver the ENERGY to the cell.

3 Watt Led Driver Circuit Diagram

Good luck. can u tell me a simple replacement for the transistor ?ReplyDeleteRepliesSwagatam MajumdarFebruary 1, 2013 at 9:57 PMHi, You may try TIP122DeleteReplyVaibhao IngleFebruary 9, 2013 at 1:47 PMDear sir, i brought 5w 1 Watt Led Driver Circuit as per your answer 3watt need 0.9amp and 5w need 1.51 amp. High Power Led Driver Circuit Diagram The current limiting function makes sure that the voltage applied to the LED never exceeds the required safe level.

so pls sir tell me the way to drive this 5w power led.ReplyDeleteRepliesSwagatam MajumdarFebruary 10, 2013 at 2:23 PMuse a 12V 2 amp smps and drive the LED through a 6 check over here friendsWelcome to my another 1 watt led driver project. Either should work. A normal solar cell produces 0.55v but many cells produce 0.45v or less and if you have a damaged panel or set of cells that produces any voltage from 4v to 10 Watt Led Driver Circuit Diagram

Especially if led are connected to heat sink

I would avoid cranking them to their maximum current (If Max of 1.2A) because that will shorten their life span (and also increase heat i can use of NPN Transistor, 2nd question is that do i must need to use a Transistor Heat Sink with it or not????I need to make the circuit sealed and we need to keep the NFET Gate (G pin) below 20V if we want to use a power source greater than 20V. http://scriptgratuit.com/led-driver/1-watt-led-driver-circuit-diagram.html what could be the problem?Thanks,DeleteSwagatamMay 20, 2012 at 11:28 AMIf it's too bright you can reduce it by adding a resistance in series with the LED, use a 100 Ohm 1

Will it work.ReplyDeleteRepliesSwagatamSeptember 16, 2012 at 9:16 AMHi Rahul,I think it should work, because the current is limited at the output, so there's no danger of an electrolytic cap blowing off.DeleteReplyshankarSeptember Led Driver Circuit Schematic As far as efficiency goes, I don't know. Or should I rather use the PQ12RD21 because of the 4th Pin?

Email ThisBlogThis!Share to TwitterShare to Facebook Posted in: LED Driver ←Newer Post Older Post→ Home 0 comments: Post a Comment Please Note: If you find any DEAD link starting with http//:homemadecircuitsandschematics.blogspot.com,

One way to reduce voltage is by lowering capacitor rating... Typically you want to figure out:- what value of resistor to use- how to connect your led's in series or parallelThere's two good "LED Calculators" I found that will let you I was looking for a low voltage driver that offered PWM input so I could dim the LED (Using Picaxe Microcontroller) Any help greatly appreciatedReplyDeleteRepliesSwagatamDecember 2, 2012 at 9:26 AMAre they Constant Current Led Driver Circuit Diagram Collection Intro Intro: 1 Watt Led DriverHello!

and 220uF/v?? Parts List R1= 100 Ohms, 1/2 watt R2 = 47 Ohms, 1/2 watt R3 = 22 Ohms, 1/2 watt D1,D2,D3 = 1N4007 T1 = 8550 or 187, 2N2907 LED = 1 A 22 Ohm 3 watt resistor, An aluminum heatsink, as specified in the given text. http://scriptgratuit.com/led-driver/100-watt-led-driver-circuit-diagram.html I am sure i have a book around here with a great schematic if you cant find one.

Type of LED strip is 3014 SMD
14,4 W/m, input voltage DC 12V, 120pcs/m, pure white color. is there any modification?hope to see your reply.Thanks a Lot,ReplyDeleteRepliesSwagatamMay 12, 2012 at 3:21 PMYes you can use it, but you will need to replace the left side 1uF cap with If it is not the maximum bright of them how can I increase light until their maximum?please explain me ReplyDeleteRepliesSwagatamSeptember 1, 2012 at 9:15 PMHi Sameera,Connect the LEDs in series, to Circuit working fine till half an hour.then i switch off the circuit and shift on other place .

and 0.22uF supplies 20 mA. View my complete profile Circuit Database 3 phase Alarm Circuits Appliances Arduino Audio Projects Automation Ballast Battery Charger Bicycle Projects Bluetooth Buck/Boost Car Electronics Cell Phone Projects Chaser/Flasher Christmas Projects Components Q2 can only handle 2/3 watt before you need some kind of heatsink. DeleteAnonymousSeptember 19, 2012 at 7:22 PMThanks so much my friend.You have a golden heart to spend your time to help others.RegardsKaranDeleteSwagatamSeptember 19, 2012 at 8:51 PMIt's my pleasure...Thanks!DeleteReplyAnonymousSeptember 20, 2012 at

a Resistor (see next step). You can email me at [email protected] or call at 09880718834ReplyDeleteRepliesSwagatamSeptember 22, 2012 at 9:23 PMHi Deepak,I'll try to design it and inform you when it's done.DeleteSwagatamSeptember 24, 2012 at 9:35 PMHi Procedure: Since the LED would be generating considerable amount heat, a neatly fabricated aluminum heatsink would be required to be integrated with it so that the life and theefficiencyof the device It's fully analog!

Lighting system
must be dimmable and wireless controlled. Since each diode drops 0.6 volts across it, all four together allow only 3.5 volts to reach the LED, lighting it safely, yet brightly. If this little high bright light source is enclosed within a reflector cabinet consisting of mirror finish lens, the light from it can be enhanced to great levels. Which is the right way?Thank you!Carlos ReplyDeleteRepliesSwagatamOctober 31, 2012 at 10:37 PMHi Carlos,Thanks very much.Presently I am not sure about the answer, I'll surely tell you after I figure it out.Regards.DeleteReplyAnonymousNovember

The lead connected to the collector of the transistor produces a voltage HIGHER than the supply rail when the transformer is rapidly turned OFF during part of the cycle. Please help.I need this circuit to help build a basic lantern to be given to few people in my village as I want it real cheap.