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| Joined: | Nov 21st, 2009 |
| Location: | United Kingdom |
| Posts: | 182 |
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We must have been thinking along similar lines.
I have just rushed through a number of tests.
OK, when I connect a speaker up the output is clear and fine.
I tried dropping the value of the resistor to 12 Ohms as the amp works between 4 and 16.
I tried red, green and yellow LEDs and I also tried a 2.2v torch bulb.
The distortion was about the same for all.
The best performance was from the BPX65 Silicon PIN Photodiode but only if I cupped my hand around it making a tunnel.
This put me in mind of a Opto isolator!
Lots more to try, laser microphones sound interesting as do the UV diodes.
But, is there any evidence for the vibration that spirit can best work with?
I had assumed IR.
Cheers
Mike