Breaking News
Comments
Newest First | Oldest First | Threaded View
SPLatMan
User Rank
Manager
Memories....
SPLatMan   9/20/2013 7:35:23 PM
NO RATINGS
Reminds me of one of my first major designs as a young 'un, a vehicle loop detector that was used in Western Australia for 15 years. The best compnent I had to work with was an LM308, which had sufficiently low input bias current to let me make a differentiator with a time constant of 10 seconds or so. The differentiator was to pick out small changes (0.3%) in the loop impedance with very low rates of change (i.e. slow moving cars).

Our competition (Eagle Signals) used a resonant loop (like TI's chip) in an AGC'd oscillator circuit, and a partially charged NiCd cell for the long time constant. I avoided resonant/oscillator schemes because of fierce interaction between adjacent loops, and opted instead for a forced loop drive with the same master oscillator driving them all.

 

It would be fun to make a loop detector with this new chip. Interesting it's not mentioned as a possible application. Maybe it's not got enough input protection? A lighning strike near a detector loop can ruin your day!

Sanjib.A
User Rank
CEO
Re: New twist
Sanjib.A   9/16/2013 1:23:56 PM
NO RATINGS
Pretty cool stuff!! TI is getting stronger in the analog domain with this kind of cool innovative products. I think there could be many promising ideas of using this device. The simplest one that occurs to me (which I would like to try) is making a cheapest, smallest metal detector gadget for fun. :)

 

rick merritt
User Rank
Author
New twist
rick merritt   9/16/2013 12:48:54 PM
NO RATINGS
Interested to see what people will do with this.



Flash Poll
Top Comments of the Week
Like Us on Facebook
EE Times on Twitter
EE Times Twitter Feed

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Max Maxfield

Feast Your Orbs on My Jiggly Exercise Machine
Max Maxfield
50 comments
Last weekend, I was chatting with my mother on the phone. She's all excited that I'm coming over to visit for a week in November. "I'll be seeing you in only seven weeks," she trilled ...

latest comment kfield Toy....or agony? :-)
Glen Chenier

Missing Datasheet Details Can Cause Problems
Glen Chenier
3 comments
It is often said that "the devil is in the details." All too often those details are hidden deep within a datasheet, where you can easily overlook them. When a datasheet reference circuit ...

David Blaza

RadioShack: The End Is Nigh!
David Blaza
123 comments
I'm feeling a little nostalgic today as I read about what looks like the imminent demise of RadioShack, at least as we currently know it. An old ubiquitous cartoon image popped into my ...

Larry Desjardin

Engineers Should Study Finance: 5 Reasons Why
Larry Desjardin
47 comments
I'm a big proponent of engineers learning financial basics. Why? Because engineers are making decisions all the time, in multiple ways. Having a good financial understanding guides these ...