led

Hi all, I have a Solar LED Light that is not working, and I want to use this to get back into electronics a little. I'm a Control Systems designer, but this level of electrical work still creates a lot of confusion for me. So I am hoping to use this as a learning project. The board is a...

Hello! I'm a junior undergraduate pursuing a degree in electrical engineering and I have a project idea I've been doing some research on. I have some experience in mBED microcontroller programming and design (like PWM and serial connections). I also have some experience in PCB design and...

I want to design a LED driver that is compact and uses mostly SMD components. It will run 1 LED at 700 mA and 3 V, and be user dimmable with a PWM signal (0-100%) as well. Additionally, It will plug into a USB port to run off of 5 V. My question is that which design will yield the least amount...

Hello, I'm doing a small project and I'm stuck. I want to control brightness of 90v 185mA LED strip with my Arduino Uno. I used bd941 transistor in series with LED strip and I'm sending signal form arduino PWM digital pin to 100om resistor and then to transistor base.(in datasheets for...

Hello, Im planning to do a very simple project but getting quite confused about where to start as I've done parts of it before but not brought everything together in one piece. Any advice on where to start would be great and I can expand my knowledge. Project Aims Simply put a box containing...

I have a simple circuit which comprises 10 G9 LED capsules in series connected to a power source. Each capsule is made up of the following circuit: Each LED dissipates approx. 0.45W for a total power dissipation of approx. 4.5W. Total voltage drop across all the LEDs is 1619V using 2.8mA...

Can someone please teach me how to diagnose what's wrong with this circuit board it's for the led lights for my tail light

Hi, Just finished doing my first proper schematic(*) and I'm worried that it's a bloated over engineered lump of components. What I'm trying to do is having 3 LEDs, powered by 2-3 AA batteries fade in and out. I've added a 4th LED which will be on when all 3 are off, I realize that could be...

Disclaimer: I'm not an engineer, just a DIY enthusiast. So I have an cheap old plastic SMD LED desk lamp but its battery and circuit board are missing. I want to turn it into a USB powered lamp for my new apartment but I'm not sure of the best way to power it. It has 31 LEDs and the label on the...

I’ve build a circuit using 3V(2x 1.5Volts AA battery)connected in parallel with a ISD1820 Voice Recorder Playback Module with Speaker in parallel with a DC Motor and a Red Led. When I turn the circuit on the LED brightness reduces and the recorded audio in the speaker doesn’t play. What should I...

Hello! I am trying to wire up a small RGB LED system in my bedroom and would care for some advice on the best/safest/most efficient way to wire up the LED strips. I have four rolls of 5m long LED strips (see specs below) and I would like to lay them out as seen in the diagram attached (see...

Sorry for such foolish question, but what is the behaviour of circuit below: LED_ON is 3.3V logic control signal, LED_STATUS is output signal to MCU pin (GPIO). When LED_ON is logic high and Q1 is open LED1 is ON and LED_STATUS = '0', but what will happen when LED_ON = '0'? Q2 will be...

hello all, I have a cheap xmas led light which I need to hack... how to hack the circuit and instead of looping the settings (blinking light types) with the button, I need the light just to stay steel. Thank you for any suggestion

My buddy and I have been working on a project for the last 2 years, its a PCB board with 79 LEDs and built-in microcontroller taillights. We can controll every aspect of them... but we've hit a snag when it comes to power. The Volvo C30 uses PWM to send signals to the taillights. This needs to...

hi, i have 4 led lights designed to work in ac but i want to use them in a garage that doesn't have power. The lights consist of just an led strip without any resistors, have a forward voltage of 60v and draw 300mA. I thought of removing the ac/dv converter and just use a 60v battery to power...

I am doing a project on automating a hydroponic system to grow tomatoes. I need a TDS sensor to measure Total Dissolved salts. I searched a lot for a sensor but I was not able to find a sensor that satisfies my requirement. I need a sensor that can measure high ppm. But, the sensors are only...

Hi there! Okay so I have 2 RGB LED Strips connected with a portable RGB LED Amplifier but I cannot get the red light to work on the second strip. The Blue and Green ones do work flawlessly on the 2nd strip. Things to note: - I've used 2 power supplies (12V, 2A) - one for the first strip...

Hello, I am planning to put together a "smart LED strip" by purchasing: - ESP8266 - this one - LED Strip (%V) - this one As far as I am concern, ESP8266 has mini USB as input (5V) and 5V as output... therefore, if I use a stripe not longer that 2 meters, I should be fine with a simple USB...

It has been over a decade since I've done anything circuit related, and I found out the hard way that I have forgotten basically everything. I am trying to make a buttonpanel acting as an input interface for PC using an arduino. I want to have 32 different momentary inputs in a 4x8 matrix. My...

I'm tryng to make a DC motor into a servo motor. The motor axle has a gear that is in sync with a gear on a potentiometer (MOTORPOT in the code) and I have another potentiometer that works as an input that the motor potentiometer should match in position however I set this pot(CONTROLPOT in...