[Robotgroup] LED's and Resistors?

[Gray Mack]

For batteries, you probably dont have to worry about
regulation, even super fresh, they usually arent much
above 1.55v I think, but put a meter on your diode
circuit with fresh batteries before attaching the 3v
component just to make sure you are around 3v.

If I stop at home I will grab a few 1N400x, you can
find these small black barrel diodes in many old
circuit boards around the power supply, often labled
4001, 4004, etc.
-Gray

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

> Right on, thank you. 
> 
> One thing I am learning is I can Never be Specific
> enough with this group, to re-iterate:
> *
> A string of White LED'S in parallel from a 4.5 volts
> DC source. I am hooking up the Additional Flashing
> Circuits (not one flasher LED!) down the string.
> *Yes, I do not want the other White LED's to flash,
> that is my problem, and not wanting to overdrive the
> flashing circuits either.
> 
> The lights have already been installed, I can Not
> run any additional wires through the Model set, I
> have to add these Flashing Circuits to the exisitng
> wiring or make a separate battery box again just for
> 3 new units. Regarding Andre's info below:
> 
> Can I get these (1N400x) @ Rat shack?
> 
> <But, its input (the 4.5V) needs to be regulated,
> since the regulation of the the output is only as
> good as its input>
> *I am not clear on this: do I need some extra diodes
> to regulate the 4.5 volts?*
> -J
> 
> 
> >From xmas light power supply
> 
> +4.5V ------------------------ +D1- ----------- +D2-
> ------------------>3V 
> Output
> 
> -(GND)
>
-------------------------------------------------------------------*
> 
> Where D1 and D2 are 1N4001 diodes or similar
> (1N400x) the various "x" change 
> the current rating. And + means anode, - means
> cathode (the side with the 
> line).
> 
> 
> 
> Gray Mack wrote:
> > 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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> >
> >
> >
> >      
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