|View single post by mikesndbs|
|Posted: Apr 19th, 2011 05:38 AM||
|Hi Ron and thanks.
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.