[Laser] Newbie

[KY1K]

If you want something to do short range on a budget, use a 
phototransistor from any photointerruptor. They are free, but don't 
expect any long range reception with them. They will not respond to 
visible light well unless the phototransistor is in a clear plastic 
package however.

For a much more sensitive receiver, spend 3 dollars for an OPT-101 or 
5 dollars for an OPT-301 (ebay prices). These are integrated 
photodiode/amplifier and draw less than 300 ua of supply current. 
They are well worth the money, the OPT-301 is preferred as it comes 
in a shielded can, greatly simplifying the construction. They are 
easy to use, very sensitive and sensitivity is very reproducible from 
unit to unit.

I'll send spec sheets for both to you via direct mail.

Keep dem laser lit and welcome to the group.

Art



At 09:14 PM 1/11/2006, you wrote:

>hey everyone, Just started modding my lase pen to make it into a CW 
>transmitter. But school have picked up for finals and havent had 
>much time to work on it but... got most of the tx done and a good 
>amount of the RX.
>
>Any tips?
>
>I can use a regualr radio shack phototransistor for the RX even 
>though it says infrared? its broad band right... Its the only one I 
>could find...
>
>Well have to go, I will ask more questions when I can start owrking 
>on it again, hihi. 73's
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