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Magenta PI Kit 815

A

Anonymous

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I would like to hear from anyone who's built this kit. I plan on using it to test various receive schemes as it's only $66USD plus shipping. Eric, any thoughts?
 
Randy,
I have built this kit with help from another person, Reg. It works pretty good. Alittle add on circuit and we are able to detect nuggets down to 7 grains easily. If I remember right even down to 6 to 5 grains, somewhere in there. The Pic chip I am presently using is 12usec. There is alot of subsitutions with the caps involved. If you are interested email me and I can fill you in on what was done. If Reg is reading this any help would be nice.
Rick S
 
Hi Randy,
Actually, Rick and I built a modified version of the Magenta 845 kit. I am not sure about the 815 kit.
The kit I built came with all the necessary parts to make a working detector, but the mechanical parts are not the greatest in the world.
The kit works ok when assembled but is nothing spectacular. It does provide a great way to learn how PI's work.
Rick and I modified the kit quite significantly from the original. The original design did work ok for coin hunting and might work ok for typical wedding bands, but severely lacked sensitivity on thin rings or small gold nuggets.
The best way I found to build this kit is to order the pc board and go from there. It is fairly reasonable and does have some changes from the original design. Also, if you ask, the company will provide an up to date schematic and assembly plans.
Reg
 
Rick,
Yes I would appreciate any info gleaned from your experience. The reason I chose the non-microcontroller 815 model (besides low cost), was that I plan on tapping off the received signal after the TX/RX switch and running it into a spectrum analyzer and see what the different frequency responses are for various metals. Then I will have a general idea for the frequency range to find gold nuggets in using either a AM receiver IC or a Double Balanced Mixer as a product detector (prefered method obviously) with some tight filtering. The idea for using a product detector came from my early years with an old Halicrafters Shortwave receiver and using the BFO to zero beat far away stations to enhance the weak signal. Which is why CW or SSB beats out AM detection by several db. Will see. Thanks for the quick reply guys. And rick if you want to send me a schmatic of your mods my email is : r.seden@worldnet.att.net
 
Iwould like info. as to modifications an schematic
Thanks
 
I am interested in building a PI and came across your letters. Could you update me. I am at corporationinthesole@hotmail.com. I am seeking a reasonable priced PI Kit.
Byrun Fox.
 
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