[Robotgroup] LED's and Resistors?

[Gray Mack]

I am assuming that you only want the one led to blink
and not to cause the whole string to blink, for that,
a transistor or 555 IC circuit might be better.

Another option (since you usually use batteries to
power your stuff) is to run a tap at your battery box
so that only 2 of the 3 AA batteries are running to
your 3 volt blinking led. The tap wire runs out to
wherever the led is on your string. You may even be
able to use the same power switch in the battery box.

-Gray

--- "john at cozmicfunk.com" <john at cozmicfunk.com> wrote:

> Hey there. I have a basic question for anyone who
> can help.
> 
> I have a 4.5 volt (3x AA) DC powered LED circuit
> with White LED's (x-mas 
> lights string from Walgreens etc.) and I am adding 3
> volt Red LED 
> flashing circuit to it. I need to step down the
> voltage reducing the 
> input for the flasher to 3 volts ( obviously
> reducing 1.5 volts from the 
> input).
> 
> I have a couple different flasher lights and LED
> compartments (all 3 
> volt DC) I am adding down the line for my hallway
> sections on my models 
> sets. I understand there is color coding on the
> resistors, which ones 
> should I get and where do I find them, Rat Shack ,
> Fry's etc.
> 
> This should be simple for people like Andre and Vern
> and Done and Gray etc.
> Thanks, John
> 
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