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patrick black (Needhalp)
New member
Username: Needhalp

Post Number: 1
Registered: 5-2010
Posted on Wednesday, May 26, 2010 - 10:00 pm:   Edit PostDelete PostView Post/Check IPPrint Post   Move Post (Moderator/Admin Only)Ban Poster IP (Moderator/Admin only)

ive built the laser communicator using the exact same parts as in the instructions and its not working. im thinking the problem is with the reciever as when i shine the laser over it i hear no noise what so ever. ive tried both the solar cell and the photoresistor but neither have changed anything. ive tried usinf both my iphone and my sansa mp3 player as a sound source.
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Theresa Simmons (Theresa)
Senior Member
Username: Theresa

Post Number: 160
Registered: 1-2008
Posted on Thursday, May 27, 2010 - 1:21 pm:   Edit PostDelete PostView Post/Check IPPrint Post   Move Post (Moderator/Admin Only)Ban Poster IP (Moderator/Admin only)

Neither of those sound sources can power an 8 ohm speaker.
They use 32 ohm earphones.

However, if you see the laser light flickering in time to
the music, you are modulating it well enough, and you should
be OK.

If you are using the piezoelectric earphone, it may have become
polarized by static electricity from your fingers. Drop it from
a height of about a foot onto a table or the floor to generate
enough electricity to depolarize it.

You can tell if the earphone is working properly by touching the
two bare leads together. If you hear clicks and scratches in your
ear as you touch them together, the earphone is working.

If you are using an amplifier instead of the earphone, test it by
holding the photocell up to a fluorescent light. You should hear
a tone when you do that, because the light is flashing on and off
120 times a second.

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