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And the real easy way is to just use 3V for your power supply, like 2 AA batteries.   Then the white, blue and Green LED's don't need resistors.   If you need another color, just paint the white LED's with a transparent color of paint.

The only down side to what Jurasikfrank is posting is that if one of the LED"s or the resistor shorts out, then the whole parallel branch will quit working.

If you have ever used the old style Christmas lights where if one bulb went out, the whole string shuts down, then you have experienced the joy of parallel wiring.

With the life time of LED's it really shouldn't be a problem.   Just let your circuit proof, by running it for a while before you seal it up in a model.   Burnouts will happen pretty early in the life of the circuit.

<blockquote data-quote="Grendels" data-source="post: 112397" data-attributes="member: 672">And the real easy way is to just use 3V for your power supply, like 2 AA batteries.&nbsp;&nbsp; Then the white, blue and Green LED&#039;s don&#039;t need resistors.&nbsp;&nbsp; If you need another color, just paint the white LED&#039;s with a transparent color of paint.&nbsp;&nbsp; The only down side to what Jurasikfrank is posting is that if one of the LED&quot;s or the resistor shorts out, then the whole parallel branch will quit working.&nbsp;&nbsp; If you have ever used the old style Christmas lights where if one bulb went out, the whole string shuts down, then you have experienced the joy of parallel wiring.&nbsp; With the life time of LED&#039;s it really shouldn&#039;t be a problem.&nbsp;&nbsp; Just let your circuit proof, by running it for a while before you seal it up in a model.&nbsp;&nbsp; Burnouts will happen pretty early in the life of the circuit.</blockquote>

[QUOTE="Grendels, post: 112397, member: 672"] And the real easy way is to just use 3V for your power supply, like 2 AA batteries. Then the white, blue and Green LED's don't need resistors. If you need another color, just paint the white LED's with a transparent color of paint. The only down side to what Jurasikfrank is posting is that if one of the LED"s or the resistor shorts out, then the whole parallel branch will quit working. If you have ever used the old style Christmas lights where if one bulb went out, the whole string shuts down, then you have experienced the joy of parallel wiring. With the life time of LED's it really shouldn't be a problem. Just let your circuit proof, by running it for a while before you seal it up in a model. Burnouts will happen pretty early in the life of the circuit. [/QUOTE]

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