Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
We are converting legacy lighted display boxes from fluorescent to LED. We have had inconsistent results depending on the power supply/dimmer and LEDs used. Our long time electrical engineer consultant sadly passed away and we are left scratching our heads. I know some LEDs require constant...
This is a circuit board for an LED head light flashlight. It has a hi, low, and stobe feature. I would like to disable the strobe feature. I am an amature, please help.
The thing is, I was trying to regulate a 220V-9V to 5 volt. I did it though. Everything was right.I was trying to make a dark sensor with NOT gate
()
The settings are good. But it wasn't working fine with the AC to DC adapter.( It is working fine with a battery like the video). The thing is...
Hello all,
I'm in the beginning stages of a project and am just learning how to use an Arduino Uno with a MAX7219 driver with an 8x8 LED RGB Matrix.
I'm using someone's source code to just get a basic understanding of how to put all these pieces together and will then modify it as I need to...
I am trying to build transconductance amplifier circuit to obtain values of the reverse biased photodiode (PD) current in order to estimate some of the LED characteristics.
At first, I have used the scheme named “Recommended Zero Biased Circuit” from page **broken link removed** (placed at the...
Non-technical guy, here. Trying to learn for a project I'm doing... A kids' nightlight.
Need a low-power, surface-mount LED with three color settings and a fourth setting that cycles smoothly through the color spectrum.
I ALSO need to be able to dim and brighten. Can anyone point me in the...
Im working on building LED strips that can be used in wacom cintiq 24HDs to replace the CCFLs when they fail because its not possible to access the lights , remove and replace, then close the monitor up again, plus the high voltage insulation isnt insulating properly, and the cherry on top is...
Hi,
I am looking to build a Bluetooth controlled LED circuit.
There must be 4 separately addressable LED arrays each with driver to control current.
A battery, charger and protection circuit.
A sensor to measure distance from the LED's to the surface they are lighting up.
A sensor to measure...
I am planing to create kind of a display with LEDs. Round or square, the board's expected size could be around 30 x 30 cm. LEDs' position is not expected to change; just the programing of the driver. Number of LEDs expected to be, most probably, around 64, laid in straight lines. Accuracy of...
Hi, I'm new to circuits and electronics stuff, so kindly help me to solve the issue.
I'm trying to add led DRL to my car, everything is working well if I power my circuit with 9V battery, but if I connect it to car battery after 3-5 seconds it getting blown. I have no idea why it's happening...
I know it seems silly but this is about being economical. Im comming up with a reliable solution that can be implemented by someone who is not particularly skilled. Although i myself have the same issue, i intend to build a driver which makes use of the monitors brightness PWM signal.
Is...
So a buddy of mine (Hi Bernard!) on another forum suggested I use a shift register for an idea I had.
A little background--I'm pretty fresh out of college and I work with high voltages all day; mainly analog power, PCB Design, soldering, Hi-Pot and UL Certification. Digital Electronics is...
Hi everyone, I am wanting to build a project that uses LEDs to "dance" or react to music. Here is a YouTube video of what I'm aiming for.
The IC I want to use for this is the LM3914. I've tested the chip using a potentiometer as a voltage divider (for the signal source) and it worked great...
Here is a Music Spectrum using NeoPixel RGB LED Matrix and ARM microcontroller.
I used the online circuit design tool EasyEDA.com to draw the circuit.
This link is my competed circuit diagram and PCB, where you can see it very clearly.
Hello,
I am a designer working on a university project with a small understanding of technology building hence why I am turning to ask from you.
I want to create a product which is essentially a scales which measures weight and links to LED lights which will change from red to green at a range...
Hi, I am modding my computer motherboard and I have a RGB led strip header. But the fact is it can only supply 1 Amp of current through the 4 pin header. I want to be able to use a variable resistor to control a 12v line straight form my power supply that can provide power for a bigger LED that...
First off I'm totally new to the electrical scene and only know what I've learned online and hands on. Which can be a bad thing if your listening to the wrong person. So here it is :
My Problem : I am using an 18 volt dc lithium drill battery to power led lights and a car horn on a project. The...
Hello, This is my first post here and i must say...this is a great forum!
Anyways, I've been getting into repairing Tv's lately. I know my way around electronics pretty well but I am not really sure how to accurately test an LED backlight inverter. Normally, i will check the pins through trial...
Given a matrix of LEDs (vertical columns / horizontal rows) I plan to draw circles with extreme LEDs staying from 1 to 8 positions from the center (shown in gray).
I came with these 8 distributions and believe they are the best approach to a circle. For eventual reference, consider the start at...
Need help with the following Homework assignment…
Design a fire alarm system using a 8051 microcontroller. The specs are as follows:
A) If the alarm is detected (one of the switches is activated) it should start flashing 4 LEDS (4 on the right (LEDS 1-4) and 4 on the left (LEDS 5-8)...
I am using a MSP430 to switch a high powered LED. MSP430 output pin can source 5ma at 5V. I want to switch a 12V source to a LED that will be driving 5A and it will be switched like a strobe very quickly. I need some help with choosing the right transistor or MOSFET in order to accomplish...
Hi there,
I realize this might be a silly problem but I'm a video guy much more than an electric guy.. I'll start by explaining my end goal and then tell you where I've landed. I am trying to put recessed ceiling LED fixtures in to a fire station sleeping quarters. There are 4 rooms, I wanted...
Would there be a way to make a small led light glow (even dim) constantly for six months to a year (or longer) using thin, and lightweight, batteries? I'm thinking that cell phone batteries will be small and light weight enough but not sure if it has enough stamina. The smallest led bulb I can...
Maybe you all can help!
I am a physics major and electronics is not my strength.
Here’s the situation: I have certain materials with which I need to accomplish a certain task (that being, to make my zoetrope)
I. The task
• Make a stepper motor rotate at certain rpms.
• Make 5 LED’s flash...
Well, I have decided to take on a rather ambitious project to start out my 2016, but I am at a loss on where to start. I know what I want the project to do, and have a decent understanding of what needs to be done, but could use a little guidance in what circuit layouts would work best.
I want...
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