[ List Subjects ][ Main Page ]
Subject: Re: Car counter
[ View Followups ][ Post Followup ]
Date: 05/30/00 at 4:07 PM
Posted by: Vorel
In Reply to: Re: Car counter posted by Jim Drew on 05/30/00 at 3:26 PM:
Jim- look at the CD4060 Xtal oscillator/divier. It will easily do what you want.
As far as using the coil to get around FCC - Not so.
The coil is a tuned antenna and an intentional radiator in the eyes of the FCC. I have had over two hundred products on the market in just about every industry imaginable and many of those were FCC regulated or exempted designs.
The only way that the other guys are exempt from certification would be extremely low power which is likely if the range is only a matter of inches. The only other way to get around FCC is to operate under 9Khz which I did on one of my products that uses coils and is exempt from FCC. It's a shopping cart theft provention system where I drive a large loop that encompasses a parking lot with a digitally encoded 8 Khz sine wave carrier. Each cart has a single locking wheel where the heart of the circuit is a tuned tank followed by an amp/squaring circuit followed by a digital address/command decoder. The entire receiver draws 8 uA ! The product continues to be covered by the major media as our market expands.
Post a Follow-up: