[Robotgroup] LED's and Resistors?

[john at cozmicfunk.com]

Thanks, I am coming tonight seeya there :0)
J
Gray Mack wrote:
> 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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>>>
>>>
>>>
>>>      
>>>       
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