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[Reply #15 on:]

How to amplify a circuit then?

[Reply #16 on:]

Ok, I would like to share a schematic, but I have to go to the cottage. ( Sorry I was not responding to quickly because my modem just "quit" , it "stuck" my telephone line . ) I will try to get some schematics on Monday - late afternoon after I am back from the cottage.

Anyway here a few link : http://www.play-hookey.com about op-amps and a few things, check http://www.falstad.com/, it got a circuit simulator, http://www.electronics-tutorials.ws/, Some eclectronics tuturails, http://www.doctronics.co.uk/beastie_zone.htm, more to check out. And http://www.kpsec.freeuk.com/study.htm

Anyway, check out those sites, experiments with your sensor. Hope you have a breadboard, a few parts, maybe a scope, but at least a DMV- Digital Multi Meter. I just bought for under $40 at Canadian Tire - Electrical Section. The have a few cheap one in the Automotive Section ( between $25 to $35 )
 
Sorry that you have a lot to read. That learning is all about

[Reply #17 on:]

I am back... here a transistor version to amplify the signal. But I still don't know what kind of signal the sensor is using... ( square ?? sine ..?? a DC output ?? ) 

[Reply #18 on:]

Here an another amp circuit...I come across yesterday, It cam from EPE mag October 1993.