Updated Stuart II Schematic

[RexK]

I found the article "Microcontroller PI Treasure Hunter" and decided to build a version as a winter project. I realize that I can purchase a kit but I prefer to build using perf boards so I can break the overall circuit board into subsystems for experimentation and testing (I also have most of the parts in my spare parts bins). I also have a PIC development system, not sure what PIC I will used (I did find the French site which features a variation of the original Stuart II). Now for the reason for the post...

I was looking at the schematic and the PC board layout in the above article and noticed a problem, the power feeds for coil & VR1 pot. The schematic shows a feed from +15v whereas the PC shows +9v. Finding this I searched this forum for corrections. I did find a "notes of change" which list some changes but nothing on power feeds. I also found some general references to several changes without too much details.

Does anyone have a marked up Stuart II schematic showing all changes?

Rex Klopfenstein
Bowling Green, OH

[johnandles]

I may have a circuit somewhere http://www.geotech1.com/forums/showt...8837#post38837

[RexK]

I may have a circuit somewhere http://www.geotech1.com/forums/showt...8837#post38837

Thanks for the response, it answered a number of questions!

There are several additional questions. First, several references to a 100 ohm resistor R28b in various posts. I can't seem to find it on revisied schematic. The other question has to do with VR1. Is the 100K and 10K pot a replacement for the single 100K pot? Is the end points wired to + or -? Finally which power (12V or 9V) is VR1 wired to? If I read the PC layout, VR1 is feed from 9v? The schematic shows a connection to 16V.

Thanks
Rex Klopfenstein

[johnandles]

I believe the original Stuart article had mistakes in the schematic.
The one I linked is correct as far as I know.
I did build a unit from the corrected schematic and pcb.
It did work but not to my satisfaction.
There are other P.I projects in this forum that work well and have a lot of resources to help you.
Hope that helps
Cheers
John

[satdaveuk]

Hi Rex
Ive considered building that project since i first joined geotech, keep at it and dont let it beat you, its a good chalenge and will keep your brain active.
Shall keep a beedy eye on this thread and see how you get on once the clever guys get a hold of your project you will proberly get to welcomed help

[RexK]

I believe the original Stuart article had mistakes in the schematic.
The one I linked is correct as far as I know.
I did build a unit from the corrected schematic and pcb.
It did work but not to my satisfaction.
There are other P.I projects in this forum that work well and have a lot of resources to help you.
Hope that helps
Cheers
John

John
What PI projects do you recommend? I am interested units based on PIC microcontrollers.

[johnandles]

John
What PI projects do you recommend? I am interested units based on PIC microcontrollers.

RexK, Tthe Hammerhead HH2 thread the P.I. is PIC based.
There is also a version by JLK which he has changed the code to incorporate adjustable timing delay.
I suggest to take a look.
Also the source code is there too.
John

[hamood123]

IC micro controller

Alslam alykom
heey sir
i wanted to ask about a circuit of (MICROCONTROLLER P.I. TREASURE HUNTER MARK STUART A powerful and stable design that is reliable, easy to assemble set up and operate)
and the link
http://www.geotech1.com/pages/metdet...t2/stuart2.pdf


my Qustions is :
first
the ic5 MAGPI-1 programmed microcontroller from what i understand it that it's a programmed is that means that this chip need to be coded or what??if it is has a code can u plz send me this code
second
the ic's
IC1 ICM7555 low power CMOS timer
IC2 TL072 CP dual BIFET op. amp
IC3 4066 or 4016 quad analogue gate
IC4 LM318 fast bipolar op. amp
do u have eny repalsment for this IC'S


thanks