Dirty small laser rx tx , rx is done with solar panel , and lm386 bf amplifier , tx laser 5mw with modulator phone/beep beep generator.
https://scontent-frt3-1.xx.fbcdn.net/v/t39.30808-6/317512080_10229445599905034_6159549783596954507_n.jpg?stp=dst-jpg_p720x720&_nc_cat=104&ccb=1-7&_nc_sid=5cd70e&_nc_ohc=BRR9U92wQ7MAX8HUUgj&_nc_ht=scontent-frt3-1.xx&oh=00_AfBZlqToG_Kn9hnQeAfh5fI1XS1zh3Kk9glmDpQRrH8qxQ&oe=638F96F5
https://scontent-frt3-1.xx.fbcdn.net/v/t39.30808-6/316039219_10229445601265068_8992980465992298828_n.jpg?_nc_cat=106&ccb=1-7&_nc_sid=5cd70e&_nc_ohc=w4CvgV-TZVsAX-QaJPe&_nc_ht=scontent-frt3-1.xx&oh=00_AfDGh0UdqaW5U2-CxtTHl9XqXxrjIIx0L7rNga4q0Gxg4g&oe=638FCEF1
https://scontent-frx5-1.xx.fbcdn.net/v/t39.30808-6/316684520_10229445601425072_4319918597847609254_n.jpg?_nc_cat=100&ccb=1-7&_nc_sid=5cd70e&_nc_ohc=iyOk3wr6vYwAX_5w9rF&_nc_ht=scontent-frx5-1.xx&oh=00_AfB-L_9oXgvHEhoui23CwNr4fBtn_k3IqIvJ-ENxSLCRLg&oe=63906214
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