- #1
Artlav
- 162
- 1
Hello.
I'm trying to make an LED light to carry sound, in a simple blink-it-like-it-arrives way.
The problem is, on the receiving end the sound arrives with a lot of distortions, most apparent in the lower notes.
Single tones are reproduced faithfully, but anything more complex sounds like 8kbps mp3 with applause.
For the transmitter, i connect the LED to the amplifier output, and use a resistor to keep it lit, so that the actual sound signal is between about half lit and 100% lit.
The kind of amplifier does not seem to matter (capacitor at the output is a part of the amplifier).
Attaching a speaker in place of an LED produces a nicely sounding speaker, so something goes wrong in the light part.
Here is the whole receiver part:
Also tried different kinds of amplifiers, but all on the left of the 1k resistor stays the same.
Not sure if it is to blame - it reproduces various blinking lights like 1kHz of LED flashlight rather faithfully.
What am i doing wrong?
How to do this properly?
Help please.
I'm trying to make an LED light to carry sound, in a simple blink-it-like-it-arrives way.
The problem is, on the receiving end the sound arrives with a lot of distortions, most apparent in the lower notes.
Single tones are reproduced faithfully, but anything more complex sounds like 8kbps mp3 with applause.
For the transmitter, i connect the LED to the amplifier output, and use a resistor to keep it lit, so that the actual sound signal is between about half lit and 100% lit.
The kind of amplifier does not seem to matter (capacitor at the output is a part of the amplifier).
Attaching a speaker in place of an LED produces a nicely sounding speaker, so something goes wrong in the light part.
Here is the whole receiver part:
Also tried different kinds of amplifiers, but all on the left of the 1k resistor stays the same.
Not sure if it is to blame - it reproduces various blinking lights like 1kHz of LED flashlight rather faithfully.
What am i doing wrong?
How to do this properly?
Help please.