Output Circuit of PI metal detector

[kazem2114]

Hi guys
I simulated the output of my "Luminous 15000 metal detector"
but I am a little bit confused of output waveforms.
my detector is a "PI detector" and it doesn't work and I wana fix it...
"IRF840" is on just for 200usec
Does it mean that my LOOP just search for only 200usec
What I expected to see was that "IRF840" be on for (1-td)
but now it's on for td=200usec
and approximately how much current according to ICs is going to coil(=LOOP)?

Please explain how this part works...
Thanks

[michael]

I'm astonished, why Qiaozhi doesn't transfer all of this guy posts about PIs to Geotech forum?
These comments don’t belong to here. This should be done for this thread and " Finding An IC " thread. Don't you agree?

[Qiaozhi]

Originally Posted by michael

I'm astonished, why Qiaozhi doesn't transfer all of this guy posts about PIs to Geotech forum?
These comments don’t belong to here. This should be done for this thread and " Finding An IC " thread. Don't you agree?

You beat me to it!

Originally Posted by kazem2114

Hi guys
I simulated the output of my "Luminous 15000 metal detector"
but I am a little bit confused of output waveforms.
my detector is a "PI detector" and it doesn't work and I wana fix it...
"IRF840" is on just for 200usec
Does it mean that my LOOP just search for only 200usec
What I expected to see was that "IRF840" be on for (1-td)
but now it's on for td=200usec
and approximately how much current according to ICs is going to coil(=LOOP)?

Please explain how this part works...
Thanks

kazem2114 - The best place to post your questions is at http://www.geotech1.com/forums/index.php
Go to the Tech Forum and start a new thread there.
The LRL Forums are for ... well ... LRLs (what else?), not conventional PI detectors.