1. H

    A current-source LED circuit with an op amp

    Dear Team, Please see the attached image which shows the circuit of driving LED using an opamp. We are fixing current through LED using opamp. I am clear about how they obtained the current equation.Isense=Vin/Rsense because opamp is in negative feedback My question is why they are not...
  2. prensmiskin

    How can I communicate the computer with the led screen

    Bilgisayarı led ekran ile nasıl iletişim kurabilirim. Bilgisayarla led ekranı rs 485 protokolü ile nasıl iletişim kurabilirim. Led ekranda c ile yazılmış bir yazılım var. Java se kullanarak bilgisayar led ekran ile iletişim kurmak istiyorum. led ekran görüntüsü Java dilini kullanarak Android ve...
  3. B

    My first electronics project, array of 9 Cree XP-E2 with dimming

    Hi all, I'm working on a micro controller project to do race timing for rowing regattas. It's coming along pretty nicely and I want to add one component: A finish light that will be turned on and off by the microcontroller. The light needs to be seen from a distance in sunny conditions. I want...
  4. Dan Aronin

    XL6005 Dimming fuction

    HI all, I want to understand the proper way to make a dimming function for the XL6005. I found some schemes that suggest using the EN Pin: And some that use the FB Pin: So which one should do the work and what PWM signal should I use?
  5. davidfet

    Low voltage and current LED on 6 hours / off 18 hours, repeat

    Saw this thread on the same topic, but it was suggested I start my own, so here goes. Former thread: https://forum.allaboutcircuits.com/threads/cd4060b-timer-circuit-design-12-hour-on-off-repeat.156495/page-2#post-1511407 Looking to power my Japanese garden lantern with a 3.85v phone battery...
  6. Dan Aronin

    XL6005 understanding the datasheet

    Hi all, a driver circuit needed for lighting a 30W LED* (one color) - I had a look at the XL6005 datasheet and wanted to make sure I understand it properly based on the following diagram**: 1. To drive the LED with 300mA I should make RS = 0.73 ohm (ILed=0.22/0.73=0.3A) 2. To limit the max...
  7. eliasklk_04


    Good night. I bought this flashlight for my bike: https://www.ebay.es/itm/Luces-Bicicleta-Luz-10000LM-Impermeable-3XT6-LED/292872854958?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649 But the light that comes out seems very little to me. I think it has more potential. Could I modify...
  8. adrumsolo4u

    Need Help with LED Driver design

    I'm trying to design an LED driver that takes a ground as ON, performs a logical NOT on it, and sends it into an N Channel MOSFET. The MOSFET will give ground to a color channel on an LED strip. LED Strip Driver-schematic.pdf I believe I have taken care of everything, but to be honest, this is...