Anyone want to help someone new at this?

K A

Enlightened
Joined
Apr 3, 2002
Messages
336
Location
Kansas
Would anyone like to take a stab at this?

I scavanged some LED's from work off some old displays that were going to be trashed. My thinking that I could use the LED's for other projects. My problem now is trying to figure how the correct values for the LED's so I don't fry them.

Pictures of said displays

Display #1 runs off 2 AA batteries and has 2 clear lens red LED's. It uses something to get the LED's to flip flop at a constant rate. It has 1 resistor and if my eyes don't deceive me the colors are " Blue Grey Yellow Gold " I assume a yellow color. It blends in well.. its really hard to tell.

Taking a Multimeter and testing the pos/neg across a led and I get a max of .60 volts on either LED. This seems rather small? Testing the pos on the LED and the neg on the battery case I get 2.10 volts.

Display #2 runs off 3 AA batteries and has 6 clear lens LEDs (3 green and 3 red). This one again has something to make the LED's look like they are chasing each other. Though how this is wired up makes my head hurt.
 

lambda

Flashlight Enthusiast
Joined
Jan 6, 2002
Messages
1,795
Location
Iowa
K A,

I would think the 2.10 volts you measured to about right for the red LEDs. The green ones are probably closer to 3.2V.
 

lux0

Newly Enlightened
Joined
May 8, 2002
Messages
101
A Vf of 1.6V for red and 1.8V for the green is typical, depending on the current through them.
 
Top