led

What happen if we mix L and N to 220v (AC) COB LED? Will it be burned out?

Does anyone here know where I could get a Longtek 6052 X-S, as mentioned on these websites? 1. https://www.electronicshub.org/digital-alarm-clock/ 2. https://makingcircuits.com/blog/how-to-make-a-simple-digital-clock-circuit-explained/ Are there any alternatives to it that works with my...

Hello everybody! In a small project I have a LED flash that should light up synchronized with a sound being played from a micro board when a button is pressed. So far I have realized that without a problem. Only thing is, that LED will lighten up instantly, while the sound boards needs half a...

I have a general question, but it refers to a specialty brand. Im looking to redo an LED "Wall" which is just a bunch of rolls of ribbon on some thin plywood painted white, that's about 18" back from some large pieces of milk plex to create a "wall of light". I plan on redoing it with this...

Hello everyone, It is my first time creating a PCB using Easy EDA, and I would like to add two RGB LEDs to my PCB. I am a little bit confused as to how to wire it. This is what I have now: I understand that to control the color of the LED, I need to send a different PWM duty cycle to each of...

Hi all, I am a compulsive DIY’er. Took electronics in HS many years ago. My wife has solar charging LED mushroom lights. One light failed, wired in parallel. I purchased a 5mm 20mA white light and soldered it in place. Colors are a lot different. Old light is a yellowish white light and...

i have a uv a led with the following specification optical watt 0.103W beam angle 15 degrees distance from surface 2.4cm also the circle created by my calculation is 0.313 cmsq is the irradiance 0.103/0.313? i have attached spectral result test if that helps

Hi, I’m working on a project that requires about 7 discrete LED’s. I’ve always just used a dropping resistor in previous projects. For this project I wanted to try to use a driver instead. I ended up getting some Diodes Incorporated BCR421UW6-7 linear drivers to test with. I bread boarded them...

I have an issue with a very simple small board I designed in EasyEDA pro (I'm a novice so if the answer is easy, my apologies). I'm not sure I correctly connected the MOSFET in the schematic. Reference to Datasheet: https://atta.szlcsc.com/upload/public/pdf/source/20140314/1457707013919.pdf Part...

VXO7805-1000 DC to DC converter supplies 5V. When the circuit is attached via USB, there is a voltage drop to 4.5V on the 5V pin of the ESP32 (DevKitC-32D and pinout). I tried adding a 10uF capacitor between ground and EN (RST) as mentioned here. I then tried 330 uF. No luck. This seems to...

Hello everyone. This is my first post on the forum, I am currently working on a seemingly simple circuit. I think a constant current driver is the solution; after wiring everything up last night the LED was nice and bright and circuit ran great. I decided to charge the Lipo over night, and when...

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?