[Laser] Newbie

[Brent]

TWOSIG at aol.com wrote:

>Let me add my welcome.
> 
>With a typical laser pointer and a phototransistor (clear plastic) you  
>should have no trouble getting a good demonstration of light  communication.  I 
>have gotten more that 800 feet at sunset (broad daylight  makes it hard to find 
>the laser beam at that distance) with the phototransistor  pointed 90 degrees 
>to the beam with full quieting.  The unit was a Ramsey  laser receiver, its 
>circuit is a phototransistor with a 1M collector resistor  followed by an op amp, 
>gain of 2, then a band pass filter, to an audio amp.  No lenses or mirrors 
>required.   I have even gotten that far  with a CdS photo resistor under similar 
>light conditions.
> 
> 
>For building circuits with ICs:
> 
>I have had good luck using Radio Shack General purpose Grid-Style PC Board,  
>part number 276-150.  They have grouped traces for IC.  I cut out a  piece a 
>little bigger than I think I will need to place a 555 timer and  switching 
>transistors with the other components.  I use a small fine  toothed saw to score 
>the board from hole to hole, then flex the board to break  it along the weak 
>line.  Then I sand the edges (not required).  When  soldering, I use a very 
>small iron and small diameter solder.
> 
> 
>Hope you have lots of fun with them.
> 
> 
>73
>James
>N5GUI
> 
> 
> 
>In a message dated 1/11/2006 8:13:55 PM Central Standard Time,  
>hamfreak2002 at gmail.com writes:
>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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>
Ya, Thx for the tips, I do plan on using PVC pipe painted flat black and 
lenses to increase range... for the IC's I guess I will just have to 
keep trying hahaha\... well schools taking up alota time with finals 
coming up so I dont know If i will be able to get anything done on it 
soon, Unfortunatly... Thanks alot for the welcomes, they're aprecciated.