Reply by lew

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Posted on Glass or acrylic LED base design help

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12103 posts in 3784 days

#1 posted 06-04-2011 07:30 PM

Most LED’s use .7v dc for the forward voltage and about 10ma (.01 amp) for the current. You will need a power supply to drop the line voltage (110v ac to about 5v dc) while being able to supply the total current for the number of LEDs you plan to use (5 LEDs x 10 ma = 50 ma or .05 amps dc). Typically an LED power source is 5 volts DC and can have just about any current capability as long as it’s high enough to provide the total required current. Because the 5 volts dc is higher that the LED’s forward voltage, a series limiting resistor is needed to keep the LED from being damaged by too much current. A typical series limiting resistor is anywhere from 270 ohms to about 1K ohm. Most LED packaging will specify the value of the series limiting resistor. Also, LEDs are polarized. They have a + and – lead. If they are connected “backwards- they won’t light.
PM me if you need a schematic.

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

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