Archived posting to the Leica Users Group, 1998/10/26
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Jim wrote: > This explains why the LED's switch on/off and required a third LED to > show > proper exposure. There is no such thing as a dim-able LED with digital > circuitry. It's either on or off. No in between. Maybe I could learn to > like the TTL after all. Actually you can. You switch it on an off too quickly for the eye to see (say 100Hz or so) and vary the mark-space ratio. Actually that's usually how you do it even with analogue driving circuits. David Morton dmorton@journalist.co.uk David.Morton@openconsulting.co.uk (+44) 171 917 6272