led

Hi, I'm pretty new to all of this, so please let me know if something doesn't make sense. I am building display units with LEDs in them, powered by a 5v USB C to make it easy to disconnect and cable manage. I would like to put a USB C port on the left side of the unit, as well as another USB C...

For the purpose of ESD training, I am searching for some component to clearly demonstrate ESD damage. From my internet search, I have found that LED specifically white should be a good candidate. LED is also nice to clearly visually show the damage, color doesn't matter. But I have tested some...

Hello, I have some questions regarding my implementation of IR LED detection with a phototransistor. Idea The main idea of the circuit is to make a circuit with incorporating a phototransistor, which will create a 0-5V signal on its output whether it detect IR LED presence. IR LED will be...

Hello all , I have this circuit that supposed to light a specific led when varDC/DC is 20V And another led when varDC/DC is 15V and so on .. My question is , why do I have to add the mosfet and the voltage divider at the exit of the comparator (the red mark)?? it seems to me that I can...

Hi all, I am trying to build some underwater lights for my boat. I am using 10 pcs of 3W RGB 6 pin leds in series and i have tested the output. I am currently using a constant current constant voltage driver. I would like to make a pcb capeable of driving the 10 leds and controling them with...

Hello all, I have encountered an AHC244 chip used to drive LEDs (Something like in the attached image) so I wondered why not just drive the LEDs with the uC pins? And also I have seen this IC used with some PWM signals as inputs to it! in this case, I am guessing the output would be the same...

Hi, When I load this code into ROM and execute it on my 8085 based computer, it works fine. The LED connected to the SOD (serial output) lights and goes out: START: MVI A,C0 ; light the LED SIM MVI B,FF ; load the delay count into the B register DELAY: DCR B JNZ DELAY...

Hi Guys, I love colorful LED light strings. I've been wanting to hand some around the house and finally got around to it. I purchased a few that seemed high quality on the web and hung them around the house. The lights worked well at first, however they soon began malfunctioning. Basically the...

I designed a simple circuit for LEDs with 5V 1A. This is the schematic, all resistances are 8.2Ω. But when everything is ready and power 5v 1A at the input. I catch it is only 0.3A on my multimeter. It should be (5.0-3.3)/8.2*4 = 0.83A. Why is there such a big deviation?

I am using multiple LEDs (20mA 3-12V) in parallel to indicate active circuits in a car. They are too bright at night, so I put a 250K potentiometer to their collective ground. At less resistance, some LEDs are brighter than others. At greater resistance, the brightest LEDs become the dimmest. 1...

Not usually one for asking questions in forums, as I'm usually able to find solutions with my own research, however, I've been looking at this over a period of days now, and the deeper I dig, the more confused I'm getting.. I'm a Computer Science student, not electronics, so please go easy on me...

I have a project where I need to make a person counter for a room. I have two PIR sensors on either side of the door, depending on which one gets set off first, it means that a person is entering or leaving. The code for this part works well enough that the counter is incremented when someone...

Hi i want to reuse a led screen panle I have a lvds cable but the cable is not designed for this panel. And i have a lvds driver for this screen panel Pls some one tell me which one cable need to be connect Panel is lvds 1ch 6 bit 30 pin And the driver is supporting 1ch This is driver pins This...

Having only 6 pins How to control using arduino??

Hey everyone, I'm working on making a custom headlamp for myself and want to have dimming functionality without using a microcontroller. I came across the IC FM2819 (data sheet attached) which has the characteristics I'm looking for, but it isn't available for purchase on DigiKey, Mouser, or the...

Hi Guys First post here I have a basic project I could do with some help on please The Job - 6 X holo ceramic garden cylinders (plant pots) with the top half having a wider diameter than the bottom half and holes in the bottom surface of the extended section. The owner would like me to...

Hello, First off, I'm a newbie. Not sure if what I'm looking for is doable, possible... I have 8 battery powered light fixtures. They come with 24v, 5a individual chargers. I would like to make a charger where I can charge all my (8) lights fixtures at once without the need of plugging 8...

Hello! I am a beginner at Arduino. I need to implement a simple circuit to control various LED glow scenarios and their reset using tact switches. I request to please help me with this project. I am attaching the image of the assembly done on bread board. The circuit is intended to function...

I have an easy project but if you have enough experience about it. -I have a led which typical forward voltage 2VDC and current value is 20mAh. -I need to drive this led at the different brightness levels. And the levels will be changed by pushing a tact switch. And I have to lock tact switch by...

I'm using a 5V buck regulator to power an LED (yes, I know I should be using a constant current LED driver). I have resistors inline with the LEDs maintain 150mA per channel (RGBW). The 5V buck regulator spikes to 7.5V for a fraction of a second when turning it on and it ends up burning out one...