🚀 go-pugleaf

David wrote...
>
[ Roger Dewhurst wrote                                     ]
[> What about putting in a voltage doubler or tripler and  ]
[> then doubling or tripling the number of LEDs in series? ]

> John Woodgate wrote:
>>>>
>>>> Let's have a competition to see how unbearably complicated
>>>> we can make the task of feeding 36 LEDs from a car battery.
>>>
>>> Dynamotor to get higher voltage; then ballast tube regulation..
>>
>> That's only two parts. We already had solutions with 30 or so.
>
> My solution has 0.1% efficiency, takes up lots of space, weighs
> a ton, and makes lots of noise.  What else could you want?

 More parts.

 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.

 12V etc   4.7k               68 2W   GND
 x-----/\/\--------x-- E   C --/\/\----x
 |                 |     B             |
 |     LM385-1.2   B     |    3.3k     |
 +------|>]----- E   C --x---/\/\------x
 |                 |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x
 |  /              |                   |
 |    /            B            LED    |
 x--/\/\--/\/\-- E   C ----o----|>|----x

 Thanks,
    - Win