Schematic for LED moonlights

[dakar]

By request, here is a quick drawing of how to wire up 8 LED to serve as moonlights; (figured I'd post it for all)

Note: This is for a 5VDC power supply, the total circuit pulls 240mA.

Given values for the LED's are 3.3V forward voltage, with a 30mA max power (typical blue LED's @ 3000-4000mcd), and resistors are rated @ 1/4 watt.

[dakar]

BTW If there are other requests for circuits just post them here with the number of LED's you are using and the source voltage/current and I'll whip you up a drawing.

[w7afm]

Dave could you draw me another circuit picture, you are just so good at it, LOL, got your last message will be answering it soon.

Bob

[dakar]

LOL sure... what voltage you want to start with and how many LEDs?

I don't draw them, I cheat a program does it all for me, including the math

[pass1over]

so if I was going to be using 15 LEDs, would I need like a 10VDC power supply?

[w7afm]

It would make a difference, the Adjustable-Voltage Regulator works from a 12V power source. The thread I was taking my information from the individual said that the LED's work from a 3.3V supply. So I started playing around with my breadboard and using a Adjustable-Voltage Regulator you would not have to use any resistors and it would not make any difference how many LED's you ran in a line as long as you had the Adjustable-Voltage Regulator connected from your 12V power supply to the LED's. So you would have your power supply then the Adjustable-Voltage Regulator then that would be connected to your first LED and the rest of the LED's would all be connected off of your first LED, one LED connected to the other in a line, I hope that made since to you. It has nothing to do with voltage using the Adjustable-Voltage Regulator with the regulator adjusted to an voltage output of 3.3V's

Bob

[dakar]

Bob is dead on.... the actual voltage of your power supply isn't critical, the amount of current available is generally more of a concern for larger numbers of LEDs. You just need to be sure the voltage it's at least 3.3V, and that each LED never sees more than that voltage, either by stringing them in serial or with using resistors to create the voltage drop.

[pass1over]

so what kind of device is everyone/anyone using to hold the LED lights?

I plan on building a canopy for my tank real so0n and was wondering how you hang your lights?

[w7afm]

You should be able to use a piece of acyclic, the LEDs do not make much heat all, just drill a hole in the acyclic, use a little silicone to hold it in place and you should be good to go.

Bob

[jojo22]

please reply to this thread:

http://www.captivereefing.com/showthread.php?t=4626