All Questions
31 questions
0
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32
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Connect LED tapes using FFC or other flexible cable to go around obstacle
Two led tapes of width ~1cm sit 1cm apart. Between them in the middle, there's an obstacle around 3mm thick. I want to connect the LED tapes with a flexible cable that goes around the obstacle. FFCs ...
- 1
1
vote
1
answer
54
views
Power supply from socket to light-up bracelet
I'm pursuing a DIY project, creating a memory box for The Eras Tour that had LED wristbands. In said wristbands are 2 CR2032 (3V, 0.2mA) disk batteries on square metal plates connected by a metal ...
0
votes
1
answer
75
views
Constant voltage for an LED lamp DIY project
I have a couple of 12V LEDs lying around, and some old 220V to DC 12V transformers. I want to build a little portable lamp.
The LEDs flicker: I guess the transformers are not delivering a constant ...
- 113
1
vote
1
answer
74
views
Powering 12 LED tea lights with recycled power adapter?
I have 12 tea lights that are each powered by a C2030 3 V battery.
Like many of us I have a box of various chargers and whatnot.
Is this as simple as finding one outputting 3 V and splitting it 12 ...
- 11
2
votes
1
answer
100
views
LED lights become darker? [closed]
I build myself a light with many small LEDs. They are quite powerful. I superglued ever LED board (the LEDs where in parts of 3 on a small circuit board) to an aluminium piece to dissipate the heat.
...
0
votes
0
answers
1k
views
How to stop LED EMI on capacitive touch sensor TTP223
I am trying to make a piece of wood touch sensitive. I have a piece of wood carved with runic letters.
I inserted LED's inside then filled the letters with epoxy resin.
When I touch one I want the ...
- 389
0
votes
1
answer
158
views
Astable Multivibrator using BC549s not oscillating
I just recently started learning about electrical engineering stuff, and since my final goal of building a Z80 Computer seems a bit far away, for now, I decided I'd make a simple clock I could ...
0
votes
0
answers
87
views
DIY LED Fixture/Panel Design Questions - 1. How to control each RGB channel (COB) or 2. How to cool a panel of 40 meters of LED strips
I'm looking to build a 1kW LED light fixture for an experimental photographic process.
I need 1kW fixture or around 100,000 lumens because of the low sensitivity of an emulsion.
I'm wondering if ...
- 1
0
votes
1
answer
781
views
Detect if external LED is on from ESP8266
Intermediate DIY-er needs advice.
I'm trying to detect if my Air Conditioner power indicator LED is on from ESP8266 microcontroller (Wemos D1 Mini).
The indicator LED is on a small PCB module with a ...
- 161
2
votes
2
answers
165
views
Using capacitors to make LED lighted dice
I've had this idea for quite a while, as I got the idea from The Stormlight Archive book series, in which they have marbles that glow. I have a limited understanding of electronics due to some intro ...
2
votes
2
answers
351
views
Why do my LED lights require a different voltage when they are hardwired?
I have a cheap set of LED string lights. There are 20 lights, all wired in parallel connected to a small battery bank. There are 2, 3V batteries wired in series, providing 6V of power to the string.
...
- 143
4
votes
3
answers
822
views
Matching number of LEDs to power supply
I have an LED power supply - constant current with output 1.4A/96W/23-69VDC. I want to buy a number of LEDs and connect these in series.
What do I need to calculate to know how many of the following ...
-1
votes
1
answer
135
views
2 LEDs on 1 SPDT switch
I'm a beginner who saw a video from YT channel DIY Perks about hooking up a 3w LED to a phone and decided to try it, changing it a little bit.
The basic idea is getting power from a phone using a USB ...
- 1
1
vote
0
answers
214
views
Removing one strip of LEDs from panel
My LED panel broke (it is a ceiling lamp).
I disassembled it, and it looks like this:
It has a series of LED strips (the last one is missing in the image), connected in series. There are connectors ...
- 111
2
votes
2
answers
83
views
Flashlight with 2 Switch without IC
I make a simple circuit with the use of Arduino and it works well, having an IC like ATTiny is good but i have a small space on my PVC Tube for DC-DC Step Down.
My goal is to make a flashlight that ...
- 121
4
votes
1
answer
135
views
Choosing LED brightness
I am planning to build an electronic fencing scoring apparatus for training purposes in our club (so no FIE certification required, it's a pure hobby project).
For hit indication, I want to use a ...
1
vote
4
answers
5k
views
DIY 5V power supply from phone charger
I want to power 25 Adafruit NeoPixel LEDs. According to the specifications they draw a maximum of 60mA at 5V each. In total that would be 1,5A at 5V.
I would like to use a 2A USB phone charger as a ...
- 13
1
vote
2
answers
136
views
DIY flashlight - USB plug [closed]
I want to do something like the first of the gadgets in this video:
https://www.youtube.com/watch?v=aEo_nJ3iUYI (0:07 - 1:00)
It's a flashlight connected to the micro USB port in my cell phone, but ...
- 11
2
votes
1
answer
5k
views
How to connect RJ45 (female) Link LED
I need a bit of help. I have some Jtron RJ45 sockets (do a quick search, for a better picture), and they have LEDs integrated.
I want to connect these sockets to a PCB and get the internet in (added ...
- 123
2
votes
2
answers
4k
views
Help with fixing LED night light that won't turn off
Software guy here, with limited practical electrical engineering skills (barely used a soldering iron since the university). :)
My daughter has a LED night light using inductive charging. After ...
- 121
2
votes
5
answers
444
views
How to power up 50 LEDs? (DIY 'fireflies' project)
I want to install lots of tiny LEDs lights in my garden (at least 50).
I DON'T want high voltage cables in my garden so I am thinking in getting a high power, low voltage transformer to power up these ...
- 834
0
votes
2
answers
138
views
LED circuit for 4 modules
I bought several LED's bulbs last years and several failed because crappy drivers.
I plan to combine 4 of these modules together and make a single custom DIY LED lamp.
Here is a photo of the modules ...
2
votes
3
answers
1k
views
Put outputs of 2 computer power supplies in series?
I've been working to figure out an LED lighting project for my classroom for a while now, readings on this site has helped. One part of the solution is to combine in series computer power supplies (...
- 63
0
votes
1
answer
122
views
which power supply rating do I use for my diy led light panel?
I'm building a led light panel using 24 x 18W SMD 5630 72LED Rigid Light Strip Tube Bar Lamp Bright White 12V 1800LM connected in parallel so whats the power supply rating
Specifications for each ...
- 1
2
votes
2
answers
530
views
Is this an RC filter in the circuit for a nightlight?
So there is this nightlight (a little flower that you plug in directly into a mains socket and switching it on gives you some light to light up your bedroom at night) which I dismantled and tried to ...
- 382
6
votes
4
answers
70k
views
Mains LED light bulb flickers when switched off [closed]
We have LED bulbs in our apartment. In the bathroom, the bulb flickers on and off when it's switched off. Same when it was a CFL bulb before I switched to LED cause I hate CFLs. Our mains voltage is ...
- 173
0
votes
1
answer
69
views
PSU with dc stepdown buck
I want to connect different LEDs that have these parameters (the LEDs I am using are just generic LEDs I got from ebay.):
Led 1: 6.4V - 7.2V @ 0.7A
Led 2: 2.9V - 5.6V @ 1.9A
Led 3: 8V - 12V @ 3.4A
...
- 115
1
vote
1
answer
2k
views
LED Shoes - circuit diagram ok?
I want to put LEDs into my shoes, specifically the Nike Air bubble (by drilling holes at the inside of the shoe and dropping them into the bubble). I also want the ability for it to light up when ...
- 11
1
vote
0
answers
74
views
Making a 1m sized 16x24 screen so that the picture is recognizable
I'm thinking about making a flexible LED screen with 16x24 LEDs.
I want the screen to be 1m wide so it will have big gaps between the LEDs.
Because of the big gaps I think the image may be ...
- 825
-3
votes
2
answers
5k
views
wiring leds for car brake lights without throwing warning lights [closed]
Im working on led tail lights for my vehicle. the standard bulb is a 21w 12v bulb. what i need to try and figure out is whether or not i am able to recreate this same load using leds without a load ...
-2
votes
2
answers
883
views
Is it possible to run 230V LED - or flourecent "spiral-tube" - lightbulb with a 9V battery?
I would like to power a 230V LED lightbulb with a 9V battery. I assume I'll have to dissect it... Surely there must be some sort of power-converter and rectifier from 230V-AC to something a lot ...
