Nice one Russ. That's about the sort of quality I'd expect from a sound-source driving an LED and being picked up by a photodiode or phototransistor.
Your audio is being rectified and clipped, remember... Not exactly Hi-Fi, but a reasonable demonstration. Imagine how far away, you'd still be able to decode the audio if you were using your sound signal to modulate one of my lasers...
Ooops... You said you were using a photoresistor not a photodiode/phototransistor...
If you try reverse-biasing a photodiode, you should get a slightly better response.
(That's what's going on in my Didge Not Included video about half way through - I show the experimental setup and the scope-shots to compare photodiodes in normal and reverse-biased configurations).
cool. But explain something to me: Won't laser diodes burn out if you send a signal through them. I WAS going to try that, but heard that a variation in current will kill the laser.
I haven't watched many videos recently, looks like I'll be visiting yours though.
I wouldn't recommend trying to directly drive a laser-diode from the signal. They are not forgiving and die easily.
My custom-built "Roadie-Special" has analogue inputs for modulating the output from a 0-5v scaled signal.
Now, imagine biasing the zero point of your signal so that the signal can swing below "zero" and above "zero" in your available voltage range of 0-5v. Decode in a similar fashion at the other end and you have probably made a vast improvement in your transmission.
Pretty cool. Seemed to transmit/receive better in the low/mid than at the high end. Next step I predict fiber optics of some sort, to cut down on background noise.
Oh, and do you know anything about what the Electrical Nanotech branch/subbranch is going to encompass? Worthwhile, yes/no?
nanofabrication and nanophotonics. Basically a whole bunch more courses all focused on nanoengineering. The design project will be different than that for regular electrical engineering. It looks like most of the first 2 and 3 year courses are the same -- mainly just the tech electives that are different.
Fellow EE student saying hi from McMaster univ.!
Gotta try that one, haven't messed around with photo resistors yet.
Bfly99 3 years ago
I know nothing about this sort of thing, but it was still fun to learn about!
LifesEyesFilms 3 years ago
LOL Im so clueless, I wish I knew about this, but it sounds cool !
parymich777 3 years ago
dude i feel the EXACT same i am sooo clueless (sorta) but i want to know more! :) Nice Work!
dazey606 3 years ago
Nice one Russ. That's about the sort of quality I'd expect from a sound-source driving an LED and being picked up by a photodiode or phototransistor.
Your audio is being rectified and clipped, remember... Not exactly Hi-Fi, but a reasonable demonstration. Imagine how far away, you'd still be able to decode the audio if you were using your sound signal to modulate one of my lasers...
RoadRunnerLaser 3 years ago
Ooops... You said you were using a photoresistor not a photodiode/phototransistor...
If you try reverse-biasing a photodiode, you should get a slightly better response.
(That's what's going on in my Didge Not Included video about half way through - I show the experimental setup and the scope-shots to compare photodiodes in normal and reverse-biased configurations).
RoadRunnerLaser 3 years ago
cool. But explain something to me: Won't laser diodes burn out if you send a signal through them. I WAS going to try that, but heard that a variation in current will kill the laser.
I haven't watched many videos recently, looks like I'll be visiting yours though.
Russoft 3 years ago
I wouldn't recommend trying to directly drive a laser-diode from the signal. They are not forgiving and die easily.
My custom-built "Roadie-Special" has analogue inputs for modulating the output from a 0-5v scaled signal.
Now, imagine biasing the zero point of your signal so that the signal can swing below "zero" and above "zero" in your available voltage range of 0-5v. Decode in a similar fashion at the other end and you have probably made a vast improvement in your transmission.
RoadRunnerLaser 3 years ago
5 STARS.
Engineering Rules! I'm not bright enough to tackle it, but I respect the hell out of it.
edenmaze 3 years ago
Pretty cool. Seemed to transmit/receive better in the low/mid than at the high end. Next step I predict fiber optics of some sort, to cut down on background noise.
Oh, and do you know anything about what the Electrical Nanotech branch/subbranch is going to encompass? Worthwhile, yes/no?
bwelkk 3 years ago
nanofabrication and nanophotonics. Basically a whole bunch more courses all focused on nanoengineering. The design project will be different than that for regular electrical engineering. It looks like most of the first 2 and 3 year courses are the same -- mainly just the tech electives that are different.
(I could be completely wrong though)
Russoft 3 years ago
Hi RUSS! :~D
Very cool and rather Interesting..... :~D
If I may... let me "backtrack" just a little more than we are probably comfortable with and ask:
What happens when a person holds it in front of a "BONG" that is currently "in use" ?
:~0
edenmaze 3 years ago
you'll hear something, not sure what.
Russoft 3 years ago
HOW COOL IS THAT?!?!?!
And I'm smarter than you HOW?
mandamk 3 years ago
well, obviously I'm gonna know a lot more about electrical engineering than you.
Russoft 3 years ago
Yes but you like..invent stuff.
mandamk 3 years ago
There's a cellphone accessory that actually makes an led blink whenever you get a message.
How did they do that?
Kalamolng 3 years ago
that sounds like a pretty easy project, but it it plugged into the cellphone? Or wireless?
Russoft 3 years ago
No its just a keychain of sorts. Its powered by a watch battery and it blinks on its on when your receive a phone call or an sms.
Kalamolng 3 years ago
cool, I'll have to look that up!
Russoft 3 years ago
Woot ur back :D!!!
Kalamolng 3 years ago
hi Russ great vid mate.
audiofreeq 3 years ago
That is SO incredible cool.
DigitalAssassin 3 years ago