Compass Coin Scanner Pro - Pro II Electrical Layout

[ron_c]

I have finished an electrical layout or diagram of the circuit board for the Compass Coin Scanner Pro - Pro II. Anyone that would like a copy of all the sheets in Jpeg format, PM me and send your email address as there are too many sheets to post here. Along with the circuit board are wiring connections also. Not to scale, it is just representations where they connect. I don't know if all CS Pro - Pro II circuit boards are the same as this one. I also have a corrected schematic if anyone would like this also. If any errors are found, please post the correction(s).

[silverdog]

If anyone in the UK is interested in this machine, there is a faulty one on ebay at the moment http://www.ebay.co.uk/itm/COMPASS-ME...item3cbfba60cc

[Qiaozhi]

I have finished an electrical layout or diagram of the circuit board for the Compass Coin Scanner Pro - Pro II. Anyone that would like a copy of all the sheets in Jpeg format, PM me and send your email address as there are too many sheets to post here. Along with the circuit board are wiring connections also. Not to scale, it is just representations where they connect. I don't know if all CS Pro - Pro II circuit boards are the same as this one. I also have a corrected schematic if anyone would like this also. If any errors are found, please post the correction(s).

If you send the files to my email, I will post them here.

[Qiaozhi]

Thanks goes to ron_c for this interesting information.
Enjoy!

[ron_c]

Question On CS Pro Schematic

On the schematic it shows a semi circle as shown below. On the circuit board the trace line leaves and then goes around and then comes back, forming a loop but it doesn't go anywhere else. There are 4 different places that it does this on the schematic and circuit board. Pin 2 loops around pin 3 but doesn't attach to pin 3 or anywhere else including any internal trace lines. Pin 3 goes to a thru hole then goes to C31. What is the purpose or function of this loop? These are the actual trace lines. The green trace line that stops goes to U16 Pin 8.

[Orbit]

And what serves twenty-pin connector?

[Qiaozhi]

If anyone in the UK is interested in this machine, there is a faulty one on ebay at the moment http://www.ebay.co.uk/itm/COMPASS-ME...item3cbfba60cc

Someone was determined to have it!

Sold for £122 + £5.97 P&P.
I bet the seller was happy.

[Skippy]

Ron.
It's commonly called a 'guard ring', and they are used to shield sensitive tracks from pickup of signals from other tracks, and general EMI pickup. They also prevent leakage currents flowing, as the voltage on the guard track can be arranged to be the same as the guarded track, as here. This would be used in sample-and-hold circuits, integrators, where a cap is storing a charge, or where currents are very low. They can also be used in reverse, to reduce emissions from noisy tracks. A complete loop isn't essential, but is commonly done.

[Sean_Goddard]

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!

[Geo]

My thanks to ron_c for all info about Compass Coin Scanner Pro

[Orbit]

compass with 2 pads! not only shown this here!

[Orbit]

Geotech has somewhere to set up both pads !

[ron_c]

Ron.
It's commonly called a 'guard ring', and they are used to shield sensitive tracks from pickup of signals from other tracks, and general EMI pickup. They also prevent leakage currents flowing, as the voltage on the guard track can be arranged to be the same as the guarded track, as here. This would be used in sample-and-hold circuits, integrators, where a cap is storing a charge, or where currents are very low. They can also be used in reverse, to reduce emissions from noisy tracks. A complete loop isn't essential, but is commonly done.

Thanks Skippy for the information on the 'guard ring'.

[DavidB]

I had one of the Coin Pro II detectors with this BD and it worked ok but not much depth. In fact the design is similar to a de-tuned Big Bud. It gave me a bad impression about Compass.
I recently got my hands on one of the early scanner models with the 3 9V batteries. It is a totally different circuit. A very nice detector for the high mineral areas with the high Q filters and ring cancel circuit. It will also air test a penny at 9.5".

[kt315]

Thanks goes to ron_c for this interesting information.
Enjoy!

Qiaozhi, looks Resistor - 3.jpg is absent file in your RAR. can you upload it? tia