leds

Are there any benefits or not, of joining 8 LED's up to 1 resistor or via 8 single resistors. Most circuits until a few years always showed any 8 bit chips each being monitored by a single LED and a single resistor. But it seems some circuits now show the 8 less being commoned up through a...

Hello! I am hoping someone can help me with a wiring issue. I have created a string of LED lights, and I have a 12V power source. Hooking those up will not be a problem, but I want to mount the lighting into a small compartment that has 3 different (small) doors. Is it possible to attach the...

Hi all and thanks in advance for your time ! I am currently designing an LED light sources that has 4 individual strings of LEDs, to be controlled by a commercial constant current machine vision driver (Smartek HPSC4). One of the strings has significantly less LEDs than the others (3 vs 8, 9...

Hi, how the real power heating current will be a for a pwm signal will be mesured in average? TrueVrms? Or will be the same like normal current. The singal is 0 to 5v. Not negative value, so is more like pulseing dc. For example, two led vf=2v connected to 9v 250ohms with a frequency of 10%hz...

I am a mechanical engineering student so only have a basic knowledge of electronics. I am using some RGB LEDs and I want to control their colour temperature and brightness. I am controlling the colour temperature with PWM but want to control the brightness with another method so the colour is...

Hello friends. Below is the design I used to switch the positive line of the WS2811 led with the TTP223.I want the led to stay on as long as I touch the sensor and turn off when I take my hand off. But when I power the circuit, the led lights up, when I touch the sensor, it turns off. So it's...

Hello!, I've made a custom pcb using comaprator circuit LM324. The purpose with this circuit is to create a led-bar 1-10 with leds ... The issue is that when the leds shifts from one level to another, it has a tendence to flicker, becuase of the digital on/off from the comparators. What I...

Hi - Does anyone remember the little gadgets that clipped on to a dil/pdip logic IC that had tiny leds showing the state of each pin? If I could remember what they were called it would be a lot easier to search for it! Great little things though. They automatically found the power and ground...

can anybody reverse engineer the circuit of this? it's a one channel chaser for a 240v load

Hello all, I'm trying to make a PCB for a LED-based lighting panel and I'm trying to wrap my head around the best way to layout the circuit. After a decent amount of scanning through the web, it seems like using voltage regulator(s) is a better way to go over the old LED array with resistors...

Big surprise to me: Over the past two years I have bought about 60 16 X 16 panels from various vendors , all sold as WS2812b and , to the naked eye they all looked identical........Looked like they came from the same manufacture and, I thought, simply distributed by the different vendors. Nope...

Hi everyone, short version: I've been struggling to find an optocoupler for my application. I think this one could work: Crydom DR06D03 but the datasheet lists the turn-on and turn-off times as "1/2 Cycle" and I don't get what it means since it's all DC on both input and output side. Crydom's...

I have a question about LED lamp: Quantum Board It has 16 strings of LEDs connected in parallel. Each string consist of 18 LEDs connected in serial. It's supplied with constant current source (with max current 2800mA, what is much more than safe current for single LED/led string). I know...

I just want to start by saying I have some knowledge, being an Industrial designer, but I am by no means an expert. I have a set of US taillights, that I have successfully converted to UK regulations (yellow indicators) and I am currently working on a dual function tail/brake light feature. I...