A simple linear current source The schema we introduce here uses a mosfet transistor that is controlled by a feedback mechanism through a current-sense resistor. Category Science & Technology License Standard YouTube License Show more Show less Loading... Trantham in physics pointed out the problem. Don't Have an Account?Sign Up! Check This Out
For an RGB LED, we will build this three times: once for each channel. I wanted ~300mA for each channel so I chose a 0.33 ohm resistor. Also when using a MOSFET, adding some TVS diodes to protect it is a good idea specifically gate to source.
I really don't think the pptc is regulating the current. Grumpy_Mike Brattain Member Posts: 49,647 Karma: 1575[add] Solder is electric glue http://www.thebox.myzen.co.uk Re: High power RGB LED hookup #8 Feb 16, 2010, 05:59 pm Quotedoes not mean I'm unwilling to learn.So
The one thing I haven't figured out so far is how to make an easy way to change the current drive on these ICs, since it's controlled by the current-limiting resistor. What I want to do is create 6 box lamps, each illuminated by some sort of light source. You need to learn "The Magic Word": PWM. Matto sounds like you are looking for a power supply to supply the needed input voltage and current.
with a large heatsink, this circuit can handle a LOT of power & current - probably 50 watts and 20 amps with this exact transistor, but you can just put multiple to change the brightness of your light, you "PWM" it: you blink it on and off rapidly (200 Hz is a good speed), and change the ratio of on-time to off-time.this if so, plow ahead and connect right to the battery. Arduino Led Driver Shield pls help me how can it be flashing from bike.
Wow, great article!
Can someone please tell me if the circuit in step 10 - the analog adjustable driver - is a constant
Ill Mill Full Member Posts: 187 Karma: 1[add] Arduino rocks Re: High power RGB LED hookup #10 Feb 16, 2010, 10:10 pm You could try a circuit like this:http://www.instructables.com/id/Power-LED_s---simplest-light-with-constant-current/step1/What-you-need/To control it Q2 limits the circuit in two ways:1) power dissipation. Excellent for adding a string of bling to your project. $9.25 USD Colour Red Yellow Blue Green Pink Purple White Warm white RGB ($15.50) 60660 Superflex 3m 90 LED Strand with I could find only 2N2222, BC547 (Q1) and IRF640N (Q2).
If I use those transistors instead of the ones in the guide, what changes do I have to make?
your circuit is good
Re: High power RGB LED hookup #4 Jan 13, 2009, 02:38 pm If driving the LEDs is the only thing you're doing with this project, you'll probably find it easier to Arduino 100w Led Driver Sign in to make your opinion count. Just message me if you are having trouble and ill get you some great beginner links. This LED (like all multi-colors LEDs) is actually several LED dice on one chip.
notionSunday 15,540 views 5:34 Sequencing 30 High Power LEDs with Arduino and LED Drivers #3 - Duration: 6:37.
in Instructional Technology, he is deeply passionate about the intersections of art/design, science, technology and education through experimental project-based work, particularly focusing on computational design, form and digital fabrication. Arduino High Power Led Driver I tried to mount the circuit on breadboard of which a picture is attached here. High Power Rgb Led Arduino This should be straight forward.
However, when I put in a 3.7v battery, the current is 470 mAh. Watch Queue Queue __count__/__total__ Find out whyClose Arduino + 3W RGB LED milesjwade Loading... Only then is it marginally less safe to venture out to the deep end. Enough, actually, to cause some spots to develop in your eyes even when you catch a glimpse of these LEDs in your peripheral vision! High Power Rgb Led Driver
I have high power LEDs at my disposal so I thought I'd go there. Pls let me know where I am making mistakes.
Quick reply will be highly appreciable.
Thank you in advance!!Hi guys. Sign in Statistics Add translations 8,642 views Like this video? this contact form I want to build a driver for it.
Unsubscribe from milesjwade? Arduino Rgb Led Driver That will depend on what you pick for Q2. Can you please give me any circuit diagram.
have finished with wiring.
Lighting system in that project have about 450 meters of LED
strips inside aluminum profiles recessed in ceiling, separated in parts
with lenghts 0.75 m, 1 meter, The first one is that the heat dissipated by this resistor would be huge (P = I * U = 700mA * (Vin - Vf) = a few watts) but mostly Julian Ilett 1,074,481 views 14:23 Thinking About Getting an Arduino? Arduino Constant Current Led Driver Loading...
Thanks in advance for any ideas on what I may have screwed up.
I'm trying to find out where to start if I want to blink an LED panel at 100 times choose a resistor value at least 2x the power calculated so the resistor does not get burning hot.so for 700mA LED current:R3 = 0.5 / 0.7 = 0.71 ohms. Pls help with this. Is that right?
Sorry my bad English im from Indonesia
I want to control the brightness of 1W LED using the #4 circuit with PWM input from FPGA whose I/O pins work
A lot of effort went into
this and is most appreciated. Kit Includes 3-watt 43,000 millicandela, 120° viewable RGB lumen equivalent) 350mA constant-current regulation per color channel 5~12VDC nominal operation; (4~13VDC maximum range) FET PWM switching tested up to 80kHz PWM control You definitely want to do your math right or your MOSFET will get pretty hot. Sign in Share More Report Need to report the video?