Compass Scanner, JE two board series (top Target ID/Notch board)

[DavidB]

Scanner_ID_Notch.pdf

A lot of people have been asking for this Compass information which until now has only been held by a few hoarders. I will have a component location diagram and bottom board schematic which includes the interface header connections latter.

[kt315]

hello David
glad to see your again being active. just opened your email letter to me saved... thats magic )))

This is DavidB. How are you? My wife is from Ch-i. She was back there last summer for a couple of months. She has lots of friends that are going back and forth to visit family every year at different times.

[DavidB]

Additional location and interconnect info



Also pin 4 of U8 should connect to -5V and I did not use a ref des U10 or U11 in the drawing, late design review on my part. On the units with this board the center wire from the Disc pot is connected to Pad 6 where either it or a pre-set auto notch resistor pair R6 and R7 is selected by U14. R49 and R50 are also a pre-set pair selected in place of the notch pot by U14 in auto notch mode. The unmarked pad at R67 is connected to the main board edge Pad 19 by a yellow wire.

[kt315]

coin scanner pro and coin scanner pro II done in SMD while your board is not in SMD. so this is not
gold scanner pro either coin scanner pro. its XP-PRO.

[DavidB]

This is the 2 board design by John Earl used in Compass Scanner XP-Pro and Gold Scanner Pro. The XP-350 uses the bottom board only and the Xp-450 has the top board but only the notch section is populated. All of the Vari filter models except the Liberties use these boards. This is not the George Pane SMD model that is similar to a bounty hunter, there is a big difference although they look similar on the outside. The George Payne model used 8 AA batteries but the Vari-Filter models use 3-9volt batteries.

[crni1]

I have a Compass Scanner Coin Master II and it has one printed tile, using 8 AA batteries, it was made in SMD technology.

[kt315]

i have to desolder gold scanner proII and give to people a chance to have new project.
so dreaming... there is magic word GOLD... but still nothing of info...
compass forum is very tweak on the info.

[turtlebowl]

KT, CRNi1............ you guys are talking about a different animal as David had mentioned. The Drawing David is sharing is of the original Scanner versions. Not George Paynes Coin scanner series. They are utterly different entirely.
Here is a photo of the Original John Earle Scanner Top PCB (TID) for comparison with your GPayne coin scanner machine. I'll find a picture of the bottom PCB and post later.




IMPORTANT: please disregard the component designators on the photo, they are private designators and not from the Factory or Davids drawing.

[turtlebowl]

For further comparison here is the top board of the John Earle Scanner Model: XP-450 with notch as the only additional feature above the stock scanner circuit. This photo identifies the notch components for you.

[kt315]

TB, i see only pics of pcb. i need full pictures with face panel plus board to sure believe you. and why you mention XP-450 while we do not say about 450?
like only example what i mean - attach

[DavidB]

The Compass Coin Pro II Is nothing more than a Bounty Hunter Big Bud modified a little and operating on 13.77khz instead of 6.5khz. This is why that model is so unstable in mineralized ground. The old JE versions with the vari-filter are very stable in mineralized ground. Totally different detector.

[turtlebowl]

Good Morning KT. There is a common mis-conception amongst folks that all Compass Scanners share the same Board. This is wrong, that was my only point, and the one David was making as well. Coin Scanners Are Not, generally the same. ONE EXCEPTION........ John Earle's first scanner was called a Coin Scanner, but there were very few made, and it is unlikely to be encountered. And, that model also was completely different than the later Coin Scanner designed by George Payne for Compass.
Would have been so much better had they named the George Payne machine something different than Coin Scanner.

ALL other scanners use the same PCB boards. Also the XP line uses the same PCB boards. XP-350, XP-450, JE-Coin Scanner, JE-Coin Scanner Pro, Gold Scanner, Gold Scanner Pro, Au-52, AU-2000...... all the same boards.
GP-Coin Scanner Jr, GP-Coin Scanner Pro, GP-Coin Scanner Pro II........ Not.

I only bring up the XP-450 because it also is the same board as the one David is sharing info on. I also am just trying to help by showing the components that make up the Notch Circuit, and because it was the only picture I had available at the moment to share of the Compass Scanner TID PCB.

Tracing these circuits out by hand and then sharing is a lot of dang hard work. Usually takes many days. THANK YOU DAVIDB. for sharing your hard work. There is nothing out there on the web about this machine except what you, David , have provided here and your submission of the XP-350 circuit a couple years ago. These machines are a nice tool and behave well in mineralized ground.
Best regards, and thanks for your work here on the forum too KT.
Phil

[kt315]

thank you TB. good story, but i am left in more prostration.
can you comment on old posting of SG?

I found Compass machines "twitchy" and not very deep and I used to be the UK importer!!

Compass (the second incarnation) were a husband and wife team of fraudsters who ripped dealers off by selling sub par machines. Then when they were sent back for "repair" they simply sold them on to the next poor sap.

I know of at least FIVE US dealers who were owed over $5000 by these cheats. I lost £4500 to them. The investigations by Police and FBI in the US are STILL going on nearly FOUR YEARS later!

When they get caught (enough evidence to prosecute) I think they are looking at at least 10 years apiece!

So feel free to copy, distribute and build ANY Compass machine you can. These scuzzers deserve it!

http://www.geotech1.com/forums/showt...-Compass-XP350
why always new topic while there is old one? that misleads me more and more.

[turtlebowl]

Sorry KT. It can be very confusing....
This is posted as a new topic because you are in the schematic section of the forum and this GoldScanner is a different machine than the XP-350 thread you mentioned.
The XP350 has no TID. David is sharing the tracing of the TID section for the Gold Scanner Model. Eventually there may be discussion here about the TID, which would not pertain to the XP350. Posting here stops confusion later about XP vs GS I would think anyways.

Sean wrote the statement you mentioned ( see post above) many year ago. I remember when he wrote that. This confuses the issue even more as you stated. Because it is yet another version of the Scanner. Lucky for us there are only a couple of these machines out there, literally.
This very last version (s) were created by an unscrupulous man and wife team who bought the rights to the Compass name but could never deliver the product. I do believe that this man and wife had the very best of intentions when they tried to resurrect Compass Electronics Inc. But Cancer struck the wife and healthcare costs broke the resurrection dream. There were no other investors or employee's to fall back on. Just the man and wife alone.
Lots of pissed off people, Sean just one of them.
All this took place after the Fire of (about) 1993. ALL MACHINES BUILT PRIOR to this date are the topic of discussion. Steve and wife only built less than a dozen I would guess so are not discussed here. But if we were to discuss Steve Goss built Scanners (1994 onward) folks would complain about lousy depth and instability just as Sean Goddard stated.. This was due to the substitution of correct parts (lack of inventory) and proper factory/test facility. The fire had completely destroyed the factory and Steve was building in his garage in his spare time. Again only half a dozen of those Steve Goss made Scanners probably and none of us will ever see one. Disregard what Sean said when thinking of the true Compass Scanner designed and built by John Earle at Compass. Those machines are great (great see through- and quiet) in mineralized ground. George Payne Scanners are not good, in hot ground.
Phil

[turtlebowl]

Here is a picture of the bottom board for the Gold Scanner Pro to go with the circuit drawing David supplied. This board mates with the upper boards I posted pictures of above.