couldn't you get a high sensitivity hall sensor and put it on a scope? DougM On Tue, Sep 6, 2011 at 3:59 PM, wrote: > > =A0Put a magnetic compass beside the wire and send the pulse. =A0If it is > working, A magnetic field will be set up and cause the compass to spin. > > Jim > > Regards, > > Jim > >> -------- Original Message -------- >> Subject: [EE] Detecting magnetic pulses >> From: David >> Date: Tue, September 06, 2011 3:38 pm >> To: "Microcontroller discussion list - Public." >> >> >> I am building a very simple magnetic pulse circuit, which sends a short >> (1uS) pulse through a coil wrapped round a solid core (using a FET). >> This is a near exact copy of a circuit I was given which needed some rep= air. >> >> What I don't have is the coil & detector circuit which picked up these >> pulses, or a schematic. =A0I know that it is some form of loop (embedded >> in tarmac) which feeds into a comparator and then a monostable. =A0Max >> distance for picking up the pulses from the transmitter is only a few >> inches. >> >> I'm stuck with the loop part. =A0All I need is something to verify wheth= er >> my pulse circuit is working. =A0As my google fu is failing me (though it >> does find lots about traffic signals), can anybody suggest how the loop >> should work? >> >> >From the small amounts I've found I think I should be able to do it wit= h >> a square "loop" of stranded wire and a resistor and expect a small >> voltage out. =A0However I can't find anything more practical than this. >> >> David >> -- >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist > > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .