Laser Audio Transmitter

My laser audio transmitter, where a laser beam is amplitude modulated using an audio output transformer (RadioShack number: 273-1380), and then is converted back to audio by a photodiode in the receiver, pre-amplified using a maplin mini-kit circuit (order code: N50FL), then further amplified by a kemo 18 watt amplifier (maplin order code: N66AW). Two AA batteries power the laser whilst three AA batteries power the pre-amp and a 1.2Ah sealed lead acid battery (maplin) powers the 18 watt amplifier.

Category:

Science & Technology

Tags:

• laser
• audio
• transmitter
• maplin

[psp3602]

are you using a photoresister as the receiver?

[48lewi]

@psp3602 It uses a photodiode, out of an old VHS recorder, a photoresistor will respond slower than a photodiode

[ricarleite]

A laser transmission will sound like an AM mono radio, right?

[48lewi]

@ricarleite It has FM transmission quality, as long as you turn off all nearby lights or you'll get 50Hz mains humm, keep the sun from directly hitting the sensor otherwise you'll get background static, and dont even ask about LCD screen backlights interfering with it ;)

[ricarleite]

@48lewi But it's a single wave frequency being transmited by increasing the energy the sensor gets. It's mono, because it's only one transmission, and it's Amplitute Modulation, since you're only transfering more or less energy. It won't get quality sound with it.

[48lewi]

@ricarleite Yeah it's mono but the sound quality is excellent, nothing like AM

[JamesWilly6206]

AmaZING

[ObiTrev]

Would it be possible to make it utilize the digital output of a PC to increase audio quality down the beam? Of course this would mean that your receiver would have the proper hardware to translate the digital audio back into an analog signal, right?

[ST0N3R420X420]

pendulum through a lazer now thats just epic :D