realization of a circuit with a photocell

[ZioToto]

hey everyone

how can i make a circuit that can relay to a range of 200m a signal generated by the commutation of a photocell.

this signal has to be a series of voltage pulse and they can range between 0 and 40mV.

can someone help me???

 

[karesz]

Hi,
for some information;>> LASER COMMUNICATIONS, https://ac6v.com/opmodes.htm
Amateur Radio Laser Communications: www.qsl.net/wb9ajz/laser/laser.htm
Laser links www.qsl.net/wb9ajz/laser/laserweb.html
200m is not very simple, but radio amateurs has rekord distances of ca 50 km_low datarate...
What is your data rate; or you wish to speach over 200m?
K.

 

[ZioToto]

i don't know... i mean it's an exercise where i have to design this circuit... i told you everything i know... i don't know anything about lasers... what i know and have studied is especially operational amplifier and its applications (comparator, filters, etc)... then modulations and demodulations (ask psk fsk ook dpsk and so on...)

 

[karesz]

OK, but what do you wish exactly to do pls?
You can search/surf lot of in these info links, its not unintelligent to learn some thing with it.-)
K.

 

[ZioToto]

i have to suggest a circuit with a photocell that has to send to 200m a signal that ranges between those values... moreover it has to be a series of pulses... at the end i have to suggest a data trasmission... that's all...

however thanks... i'll look better those sites...