[sdiy] Low Pass Gate is soooOOOOooo sweet

[Paul Perry]

At 11:28 PM 8/05/02 -0400, King Harry wrote:

>With some of the new ultrabright white LEDs
>(or any other color that matches the cell response
>well...) you should be able to make the response
>time of a (gasp dare I say it...) DIY photocoupler
>much faster than these old designs. LED have come
>a long long way since my first one in 1974...

The problem isn't the led, it is the recombination rate in the 
cadmium/selenium sulphide mix. that hasn't changed....

paul perry Melb Australia