Tagged Questions

3
votes
1answer
44 views

calculating resistance for LED strips to use as parking lamps and turn signals

I'm installing LED strips in my car's tail lamps to convert it from conventional bulbs to LEDs. I have a understanding of what I'm doing but not the complete knowledge to make the circuit work ...
1
vote
1answer
223 views

How do I select the Correct Diodes and Resistors for my LEDs?

I've got a 2009 Harley-Davidson XR1200 (that can be seen at the bottom of my bio in my profile). I've replaced the stock incandescent bulbs with nice looking LEDs; however, the stock bulbs were 2-way ...
5
votes
3answers
178 views

Dropping voltage for red channel on RGB LED

I'm looking at a Multicomp OSW-8349 RGB LED, which has a Vf of 3V min / 4V max for the green and blue channels, and a Vf of 1.8V min to 2.8V max for the red channel, at 350mA. I'm planning on ...
10
votes
1answer
210 views

Is this LED fixture safe for use with its current fabrication?

My father is currently interested in investing into a Ukrainian LED fixture manufacturer, and after he bought home a sample, I'm scared. There are 94 LEDs paired up with diodes, all in series, ...
1
vote
0answers
201 views

Using a diode or resistor, to supply minimal voltage to LED Driver (Help!)

I'm using a dual 60W LED multi-chip pendant lighting (a.k.a. "high bay" pendant light with two 60W LED chips). This light is using an RGB driver (one per multi-chip) that has a remote control to ...
3
votes
4answers
2k views

Driving an LED/Laser diode with a RF signal up to 20 MHz

I'm trying to design a circuit that will let me drive an LED or Diode laser with a RF signal up to ~20 MHz or so. Since the optical device will need to be biased with a DC current, a bias -t is a ...
1
vote
1answer
269 views

Anode RGB LED Arduino Hookup

My question is regarding the hookup of a radioshack bright rgb anode led. I have the led common going to a 5v supply and the other pins are going through a 330ohm resistor to 3 PWM output pins ...
-1
votes
3answers
1k views

Zener Diode for Minimum Voltage Regulator

I forgot the name of it, but I remember one post where it said that you can use a zener diode as a "minimum voltage regulator". I don't think I used the right term for it, but here's what I'm doing. ...
6
votes
2answers
376 views

Why can small LEDs only conduct ~20mA and a 1N4001 can conduct 1A?

I know red LEDs have a higher forward voltage drop than a silicon diode; this leads to about 2.6x more power dissipation at a given current and so 2.6x less current rating, but 20mA is way less than ...
2
votes
1answer
766 views

LED modeling with Shockley diode equation

I'm working on a project where I need to model the voltage/current relationship of various LEDs. I'm wondering what values I would need to use for the saturation current in the Shockley diode ...
11
votes
2answers
7k views

How do I model an LED with SPICE?

What diode modifiers are used in practice to model LEDs with SPICE (Berkeley v.3f5)? These are available to me: ...
12
votes
4answers
535 views

Simple Circuit Question

I've been playing around with an Arduino for a while now, and while I know just enough about simple circuits to get little projects up and running, I still don't know enough to figure out what's going ...
5
votes
10answers
2k views

Using diodes to limit current to LEDs

I'm setting up an attiny2313 to drive an array of LEDs and blink them in different patterns. Rather than putting a series resistor in line with each LED (they'll be controlled separately, so I can't ...