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Lobo Circuit Board Details


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This is photo of what my circuit board looked like on the Lobo ST.

The pot circled in red is the ground balance pot. The one next to it is a disc pot. 

On mine I marked the ground balance pot before I turned it counter clockwise. I turned it a little less than 1/2 way. In my mild ground with the 8" concentric coil it would hit my 10" test dime.

Lobo st.jpg

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1 hour ago, Rick N. MI said:

This is photo of what my circuit board looked like on the Lobo ST.

The pot circled in red is the ground balance pot. The one next to it is a disc pot. 

On mine I marked the ground balance pot before I turned it counter clockwise. I turned it a little less than 1/2 way. In my mild ground with the 8" concentric coil it would hit my 10" test dime.

Lobo st.jpg

Good work!

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Did it help you any? I wish I still had my Lobo ST.

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43 minutes ago, Rick N. MI said:

Did it help you any? I wish I still had my Lobo ST.

Not sure if I'll be making any adjustments at this time. Good to know which I can adjust and for what. I got a deal on this Lobo S.T. So I figure that I'll keep it. I have a soft spot for Tesoro's. The big box El Dorado was my first detector, which I kept for 30 years. It served me well, was a bit sensitive to EMF though.

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On 3/29/2021 at 10:28 AM, Steve Herschbach said:

If there is anyone out there with a Lobo ST, it appears there is a need for a good, clear set of circuit board photos, that can then be marked up with notes. There are bits and pieces of info scattered about, but I’ve not found a clearly noted Lobo circuit photo despite some time with Google.

Tesoro Lobo ST Data & Reviews

For sure on that! A schematic would be a life saver. I could draw one up but it would take a fair bit of time to do it. I just don't have one to reverse engineer. Trouble is with the ST is what I have seen as at current here in the photo posted, they are SMD which makes it tougher to do. I have attempted to track down this info myself and spent a good amount of time to come up with NOTHING yet. Someone has to have this info but finding out who is the deal and it would probably require a subscription fee to access that info. I used to have that kind of access years ago when I was doing repair work on electronics, I gave that up because a lot of the time it cost more to fix stuff then it did to replace it. The ST has a bunch of additional circuitry for the auto track which has made it much more complicated, and the parts are much smaller too, things are a lot more crowded on the board. 

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On 3/29/2021 at 10:30 AM, Rick N. MI said:

This is photo of what my circuit board looked like on the Lobo ST.

The pot circled in red is the ground balance pot. The one next to it is a disc pot. 

On mine I marked the ground balance pot before I turned it counter clockwise. I turned it a little less than 1/2 way. In my mild ground with the 8" concentric coil it would hit my 10" test dime.

Lobo st.jpg

Thing is with this model the board is most likely a multiple layer which makes it even harder to reverse trace the circuitry. The Russian clone model on Ebay is only a 2 layer, conductors on both sides and nothing in between with a laminated board. It's a big enough mess by itself and for sure this model is way beyond that. Is this a replacement board or was it removed by unsoldering the leads? It appears to be a new board with no solder in the J points, so there must be some instructions lit for it. If so, it would be a big help to Trisha providing her board isn't toast now. I would like to know as much as could be provided about this detector just for my own benefit and for others. 

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27 minutes ago, Lobo Exp said:

For sure on that! A schematic would be a life saver. I could draw one up but it would take a fair bit of time to do it. I just don't have one to reverse engineer. Trouble is with the ST is what I have seen as at current here in the photo posted, they are SMD which makes it tougher to do. I have attempted to track down this info myself and spent a good amount of time to come up with NOTHING yet. Someone has to have this info but finding out who is the deal and it would probably require a subscription fee to access that info. I used to have that kind of access years ago when I was doing repair work on electronics, I gave that up because a lot of the time it cost more to fix stuff then it did to replace it. The ST has a bunch of additional circuitry for the auto track which has made it much more complicated, and the parts are much smaller too, things are a lot more crowded on the board. 

I tried their facebook page, hoping someone still comes back to it once in awhile.

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6 minutes ago, rled2005 said:

I tried their facebook page, hoping someone still comes back to it once in awhile.

Good luck on that. 

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On 3/22/2021 at 5:51 PM, rled2005 said:

There’s a momentary push button that I was most curious about.

If you mean J20, it's right next to the micro which means it is probably used to set the micro in a particular mode or state for factory cal.

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2 hours ago, Geotech said:

If you mean J20, it's right next to the micro which means it is probably used to set the micro in a particular mode or state for factory cal.

Thank you. That was my suspicions.

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