🚀 go-pugleaf

In article <aqdlqr01vcm@drn.newsguy.com>,
 Winfield Hill <whill@picovolt.com> wrote:

>>>> Winfield Hill wrote:
>>>>>  I was taught to make efficient designs by insuring every part
>>>>>  has a purpose and carries its own weight.  With that in mind,
>>>>>  here's my entry, a slim 32-channel adjustable current source.
>
>>> ehsjr@bellatlantic.net wrote...
>>>>
>>>> Where's the remote current sensing/ individual current
>>>> auto-adjusting circuit for each LED?
>
>> Winfield Hill wrote:
>>>  Oh, sorry, I've fixed it now.
>
>Clifton T. Sharp Jr. wrote...
>> So where's the polarity-reversal mechanism to change the color
>> from red to green? :-)
>
>I apologize for leaving that important feature out.  Now fixed.
>
>> 12V etc
>>  |     4.7k               68 2W      gnd
>>  +---/\/\----+--- E   C --/\/\----+--------------,
>>  |           |      B             |        -Vref |
>>  |LM385-1.2  B      |     3.3k    |           |  |
>>  +--|>]--- E   C ---x----/\/\-----' LED color |  |
>>  |           |                       control  |  |
>>  |           |        LED, two-pin     | |    |  |
>>  |           | N-FETs  two color       | |    |  |
>>  |           |    \  ,---\--------+----|-+    |  | Imon
>>  |           |     \ |  ,-\------XX--+-|-|----|--|--o
>>  |           B    ,-XX--|--\--,      | | |    |  |   
>>  +-/\/\-+- E   C -+     +-|>|-+      +-|-|-/\/\--+        
>>  |      |    |    '-XX--+-|<|-+--XX--' | |    |  |
>>  |      \    |       |____________|____| |    |  |
>>  |      /    |            pd           | |    |  |
>>  |      |    |  ,--||---+-|>|--,       | |    |  |
>>  |      |    |  |   /-|-+------|--/\/\-|-|----+  |
>>  |      '----|--+--<  |        |       | |    |  |
>>  |           |      \+|--------+-------|-|----|--+

[snip]

I wonder if we can use a variable frequency drive to adjust the white 
balance of a white LED, like you can with some fluorescent tubes and EL 
panels.  :)