[Laser] first time, simple system, but problem

[Kerry Banke]

Adding the series cap and resistor  from  the LM386 output to ground 
is critical for stability or it will definitely oscillate. For 
alignment ( I assume we're talking optical) you certainly need some 
form of at least a sighting tube to look through or preferably a 
cheap rifle scope to mount on each unit. To align the scope or tube 
we build a simple fixture which has a round bicycle reflector with an 
LED mounted in the middle.  The LED is driven by a 555 timer set for 
some audio frequency maybe 1 KHz depending on the response of your 
system.  The receiver is peaked on the tone from the LED and the tube 
or scope aligned to see the LED ( this needs to be done at some 
distance to reduce the parallax).  To align the transmitter to the 
tube or scope, point the transmitter until you see it in the 
reflector and then adjust your tube or scope to see the reflector.
  - Kerry N6IZW -


>I just added in the bypass caps, seems to helped alot but still 
>there some, ill move them right to the pins and also add in the cap 
>w. resistor and see what happens. Thanks all for your suggestions 
>and ill keep you posted. Gotta finish the TX and give it a try, 
>still, any tips on a simple way to aling everything?
>_______________________________________________