Outside view of the MCW TX system
Inside view of the modulator
Circuit diagram of modulator
Some laser pointers, pigtails added
to a couple for example
2) Next best easy way..
this company sells 2 kits... (they are not on the website)
One is a "laser simulator" (a 555 with a bright LED) easily changed
to
drive a pointer instead. And.. Change timing cap to make it 800hz
instead of 1hz.
about $5
Other is a "laser target" (a IR PIN with audio amp) in the cct the audio
amp drives some LED's that light when you hit it. Instead you
hook up a
speaker and sound comes out! from above laser simulator.
about $8
0) none of these are gonna set any records.. but with a 8x10 fresnel
you
will make 20 miles or more with a 2mW laser pointer.
1) TX: 555 timer circuit in astable mode (oscillator) interrupted with
pin 5.
2) RX: either of 2 ccts: a phototransistor (cheepo.txt) or a PIN
feeding into an audio amp. (you can buy pocket audio amp at RS for
$12)
