After less than ideal performance using the unit below (hissing on high gain, whining from engine noise, hollow sound, etc), I did some more digging on the net to look for possible fix... I find this article/document to be very informative and deserve a mention here on my blog for others to checkout...
I'll add the output and grounding resistors as suggested by 9W2DTR... I'll set the output resistor to 100R and the ground resistor to 100k... I'll add some ferrite beads on the power lines as well to tackle the engine noice...
I will update on the performance later... stay tuned... :-)
Update: March 25, 2008
The fixes above worked... audio is cleaner, clearer, louder with no whining...
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