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Anonymous
 
Posted on Friday, June 3, 2005 - 12:28 am:   Edit PostDelete PostView Post/Check IPPrint Post   Move Post (Moderator/Admin Only)Ban Poster IP (Moderator/Admin only)

I made the laser communicator by following instructions on the web.

Since I don't have an amplifier, I got rid of the earphone jack at the end
of the receiver and I connected two leads to an earphone jack that is attached to an earphone, hoping I can hear music through the earphone.
(So I have an earphone with its jack connected to two leads: one coming out from the photoresistor and the other one from the negative side of AA battery)


The way I tried to see if this works was:
Radio --> transformer --> earphone jack(with earphone)
Of course there were batteries too.

It worked perfectly. I could hear music.



after this I put the laser and the photoresistor in between

Radio --> transformer --> laser --------------> photoresistor --> earphone jack(with earphone)

but all I could hear was sparks. . not a significant musics.
One thing is that I put a 100 ohm resistor to prevent the laser from degenerating; this makes the laser point somewhat dim, , but still visible
up to 2 meters.

I am not sure if the photoresistor has a problem. . or the laser(I tried 2 differnet kinds)



Should I buy an amplifier to hear the sound?
Can't sound come right into my earphone through the laser and photoresistor?

If there's any other way to hear the music without an amplifier
Could you please tell me how?

Thanks in advance.
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Mr. Marvic Catania
Unregistered guest
Posted on Thursday, June 23, 2005 - 7:45 am:   Edit PostDelete PostView Post/Check IPPrint Post   Move Post (Moderator/Admin Only)Ban Poster IP (Moderator/Admin only)

to whom may concern,

I dont know how to help you in your problem, but i am interested in the same matter of experiment, i am a student doing a dimploma in electronics an i would like to know anything related to laser comunication, if possible any schematics or designs would be of great help. if i succed in my intent i would shurly give you my support. contact me on triac18@hotmail.com

thanks for your help.
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Simon Quellen Field (Sfield)
Senior Member
Username: Sfield

Post Number: 504
Registered: 12-2004
Posted on Thursday, June 23, 2005 - 10:05 pm:   Edit PostDelete PostView Post/Check IPPrint Post   Move Post (Moderator/Admin Only)Ban Poster IP (Moderator/Admin only)

A silicon solar cell and a piezoelectric earphone are all you
need for the receiver. If you are using a cadmium sulfide
photoresistor you will need a battery in series with the cell
and the earphone.

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