[Ronja] A few questions

[Gyurkó Martin]

The LED also has to be able to be modulated at 20 MHz frequencies. 
Brightness alone does not help.
If someone could try out all those red star luxeons going at 1W, wether 
they are fast enough, that would be nice.
But eye safety is still not an "oh well".
If it is your own eye, do it. But you can not guarrantee that birds and 
children etc. are not looking into the beam.


Martin

Alec Wright írta:
> On Tue, 2007-10-30 at 20:53 +0100, Karel Kulhavy wrote:
>   
>> You should have a PCB for Twister or Twister2. Transmitter and RX aren't
>> so critical.
>>
>> If it's wired logically correctly (I didn't check) then yes - what's happening
>> there with the 133's and the following 32 and 00 is that 17 wires are AND-ed
>> together. You can use a different method to achieve the same logical result.
>> Just if some wires encounter longer propagation path in your replacement
>> circuit, hook them to the 4040 outputs that are lower on the schematic. Since
>> if the number in these counters increments, the bits flip consecutively from
>> top to bottom and the whole logic is designed with this assumption. If
>> this is not met, it could produce glitches - or at least require some
>> thinking to prove that it won't glitch.
>>     
> Thanks :)
>   
>>>  
>>> 3. Could I increase the range by adding more ultra bright LEDs and using
>>> different lenses? I'm hoping for about a 4km range (!!)
>>>       
>> No - only one LED can be in the focus of a lens.
>>     
> How about a single ultra bright one?
> http://www.rapidonline.com/productinfo.aspx?tier1=Electronic
> +Components&tier2=Optoelectronics&tier3=Power+LEDs&tier4=3W+Power
> +LED&moduleno=74700#techspec
> The above is 75 lumen, which is colossal compared to the 3.8 lumen one
> which is recommended in the guide. This will probably violate eye safety
> laws, but oh well :)
> I might even be able to get a neon light in.
> And I know I'll need to put a few more transistors in it to power the
> 0.7A LED too.
>
>
>