I want to create a transmitter which transmit light signal when a electrical signal is given.im hoping to use a laser drive....is there any cheap laser drives?
I have a cigarette lighter with a built-in laser pointer I picked up for $3 at a gas station. If you can find one of those, try modulating the power with a drive transistor.
Its worth noting that the laser or led output will not be linear with the applied current. I suggest you use an fm or pulse length modulation system to get any kind of decent results from whatever you do decide on as a emitter and receiver
(The receiver/detector is also unlikely to be very linear !.)
hey JOHN F,
i built a laser transeiver circuit which i found on http://www.geocities.com/SiliconValley/ which transmit RS232 output of a PC. still i didnt test it though...may be tommorrow..i need to go for a higher speed of data stream cos i wish to send a 2Mbps data stream through a fiber cable...i think what u have told is important to me but i didnt understand it well.can u explain bit light what uv told?..pls..pls..
Thankz
A drive transistor would be like this MPSA06 - **broken link removed**
- where they are driving it with a port pin.
Easier still, here's an "instructables" where they send music over a laser module like the one in the lighter just using a transformer and no drive transistors. Send Music over a Laser Beam
It also shows has a very simple recieve circuit - **broken link removed**