Has anyone modded their cibola with GB knob?

[pan4au]

These are the 10 turn pots I use for my PI since finding them, they take less room inside the control box as the pot is for the most part external.

You can buy them off ebay from China.

Thanks for posting.. they sure take up less space..

 

[Kmaz]

These are the 10 turn pots I use for my PI since finding them, they take less room inside the control box as the pot is for the most part external.

You can buy them off ebay from China.

Oooohhhh .. I like that. I wanted to put an external gb pot for my Deleon all metal mode but there just isn't enough rm to put it where I wanted too. Thanks for sharing

 

[Mega]

Sven,looking at putting one of those pots on my Mirage and Crossbow as well,and also the IDX Pro,what is the buy quantity like can you buy say 5-6 or are they in bulk of say 20+ to make it worth the postage etc ??

 

[Stoof-tabsallday]

These are the 10 turn pots I use for my PI since finding them, they take less room inside the control box as the pot is for the most part external.

You can buy them off ebay from China.

Those are the 47k ohms ones? They have all kinds on there. 47 is closest to the 50k I would say.
I really like those. Takes almost no room in the housing!!!
Do they function well?

 

[Kmaz]

They seem rather large on outside though... It seems Bourns either still makes them or at least they did. Sven , is the exterior knob 1-1/2" tall with a diameter of 1-1/4"?

 

[Sven]

Those look awesome!! So there are 3 of those prongs on there? One high, one low, and one wiper?

All pot types have three leads. Depending upon application, only two of the three leads are used. In Tesoros as a GB control, only two leads are used.
More or less an in and out, center lead and an outside lead depending if you want the pot to turn clockwise or counter clockwise to increase a control setting.
Center lead #2 is always the wiper . Outside leads 1& 3
On some pots leads are staggered in a triangle position, top of triangle is always center #2.

Some may get confused with the pot leads. The Bournes pots lead positions maybe layed out a bit different depending upon the one purchased.
#2 center lead is positioned at the lead near the back of the pot and 1 is in the center. You will see in the two pictures. You have to look at the diagram on the pot to make sure of the placement.
The diagram both show the wiper in the center, if you follow the lines to the actual leads, you will see one shows the wiper go to center lead and the other to the outside lead.
If your not paying attention you can easily wire up the pot wrong.
As I indicated in another post, trimpots leads can be labeled in reverse as well. So you have to look at the trimpot number configuration.
There's a good chance 50/50, the first timer may wire the pot wrong. So you can see how any easy mod for some one with electronics experience with fluster some one that is not when the device
will not work correctly. Generally you would first at that point be considering the wiring is not right, instead of coming to the conclusion you just fried you device.

 

[Sven]

47K is no different than the 50K.
As there is always a plus or minus 10-20% tolerance in manufacturing.
Unless you get a military type precision pot for a precision instrument in a jet fighter or a spaceship going to the moon.
Your Tesoro is not a precision instrument that demands 1% tolerance in part values, its parts tolerances can be all over the board......
That's one reason you may get a good Tesoro, an average Tesoro and or a hot Tesoro. All depends upon where they get their parts at any given time.
If it was a precision instrument, most would not be able to afford to own one.

 

[Stoof-tabsallday]

Those look awesome!! So there are 3 of those prongs on there? One high, one low, and one wiper?

All pot types have three leads. Depending upon application, only two of the three leads are used. In Tesoros as a GB control, only two leads are used.
More or less an in and out, center lead and an outside lead depending if you want the pot to turn clockwise or counter clockwise to increase a control setting.
Center lead #2 is always the wiper . Outside leads 1& 3
On some pots leads are staggered in a triangle position, top of triangle is always center #2.

Some may get confused with the pot leads. The Bournes pots lead positions maybe layed out a bit different depending upon the one purchased.
#2 center lead is positioned at the lead near the back of the pot and 1 is in the center. You will see in the two pictures. You have to look at the diagram on the pot to make sure of the placement.
The diagram both show the wiper in the center, if you follow the lines to the actual leads, you will see one shows the wiper go to center lead and the other to the outside lead.
If your not paying attention you can easily wire up the pot wrong.
As I indicated in another post, trimpots leads can be labeled in reverse as well. So you have to look at the trimpot number configuration.
There's a good chance 50/50, the first timer may wire the pot wrong. So you can see how any easy mod for some one with electronics experience with fluster some one that is not when the device
will not work correctly. Generally you would first at that point be considering the wiring is not right, instead of coming to the conclusion you just fried you device.

I don't think I fried it. It still works great!!! Just have to be way cw on pot to get neutral gb. I got the Bournes and it is wired right terminal 2 and 3 (bottom and top) and it does change the GB. I just have a whole lot of negative I can go and only a little bit positive from neutral lol.
Gonna reopen it today and triple check, but I pusted the pic earlier of how I have it word on the tabs on the pot (#2 wiper and #3 cw highest)
In the end, it's better than it was without the pot, so it was a success. Just have to investigate why is acting so weird compared to everyone else's as well as my bandido.

 

[Sven]

Sven,looking at putting one of those pots on my Mirage and Crossbow as well,and also the IDX Pro,what is the buy quantity like can you buy say 5-6 or are they in bulk of say 20+ to make it worth the postage etc ??

You can buy one or as many as you want from China, postage is cheap or free. Just have to be willing to wait up to 30 days for them to arrive.
They are all I use on the Mirage PI for microscopic frequency adjustments to kill EMI, and will work just as good on the CrossBow. Not needed on the IDX for GB, which works just fine using a single turn. Which can be easily adjusted to the exact GB, nice thing about the older White's. No harm putting one in the IDX. I didn't have a spare one, at the time of the mod, would have considered putting one in.

The older Fisher detectors used a stacked pot, two pots in tandem, main pot for coarse and one for fine adjustment. Since GB using a single turn pot could not be adjusted properly, a second fine tune pot was needed
to dial in GB. That's why detectors such as Tesoro use a 3 3/4 turn instead of a 1 turn. Since 3 3/4 turn Bourns pots like Tesoro uses are built to order, no one has the correct, configuration value in stock. So we use the common 10 turn.
There (3 3/4 turn) were some surplus 100k 3 3/4 turn pots on ebay at one point, correct value for the other umax models GB, just had a different diameter shaft. If you knew about them, you grabbed a bunch. You won't find them in the 50K. And Tesoro will not sell you the 50K.

 

[Sven]

Your Bandido uses all three leads. See pix


The Cibola uses two leads on the pot 2 and 3
Lead 2 goes nowhere. Just hold the pot in place.
Looking back at the Cibola pix I had you could solder the pot wires to the two solder pads that were used for the Vaquaro's external GB pot.

 

[Stoof-tabsallday]

So was I supposed to solder to the pads where the trim pot was or through the hols like in your pics for the mod?
I went through and soldered to those holes in that pic.
You're confusing me about what you mean. I did like the pic shows..

 

[Kmaz]

Think he meant the one labeled 2x goes nowhere. This whole thread is only gonna discourage people from doing this mod

 

[Stoof-tabsallday]

Well gents,
A bit better today balances perfectly @1.5 turns negative from fully clockwise. So a half a turn more negative than before.
But it's good enough.
I'll hook it to a meter another time.
I've lost 2 days of hunting worrying about this.haha

Oddly while playing with the knobs, I found something odd...

If AM is a different circuit, then why does the threshold sound go wonky for a sec when I move the disc knob in all metal? Not sure if it's supposed to but I found it weird.

Anyway, thanks for all the help and ideas guys!!

 

[Sven]

Oddly while playing with the knobs, I found something odd...

If AM is a different circuit, then why does the threshold sound go wonky for a sec when I move the disc knob in all metal? Not sure if it's supposed to but I found it weird.

Anyway, thanks for all the help and ideas guys!!

Think I remember some one higher up saying this is normal, even on a lot of older other brand detectors.

 

[Sven]

raYour good, some Tesoros do not have the extra two holes you can solder to.
In your case on the Cibola it does, if you were using the same board in the Vaquaro, the trimpot is not soldered in place, they use the two holes for the external pot wires.

Same board for two model detectors with a spot for a trimpot or two solder pads with holes to solder wires to for external pot.
So you can charge $500 more for a car with a cigarette lighter installed ........................but, its still the same car but, now can start a fire.

 

[Sven]

Think he meant the one labeled 2x goes nowhere. This whole thread is only gonna discourage people from doing this mod

Well hopefully it should give owners second thoughts about doing the mod, it could prevent a bad end result.
Some folks can't afford to buy a new detector or even repairs.
It's better to have some one experienced do it right or sell your Cibola and spent the extra money get a Vaquaro.
Resale value is not good on the modified Cibola, sad to say, as you don't know who did the mod................
It won't matter to doing the mod, if the Cibola was a cheap buy, willingness to accept a non functioning unit on a bad mod and can take the loss, chalk it
up to a bad experience and move on.

Tesoro doesn't care one way or the other, they will be happy to fix your detector for a price over and above the cost of $50 to just look and do a simple repair.
Bet they would love to sell you a new circuit board for $300 or so.

At least Tesoros are tinkerer friendly, for some.

 

[Stoof-tabsallday]

Think he meant the one labeled 2x goes nowhere. This whole thread is only gonna discourage people from doing this mod

Well hopefully it should give owners second thoughts about doing the mod, it could prevent a bad end result.
Some folks can't afford to buy a new detector or even repairs.
It's better to have some one experienced do it right or sell your Cibola and spent the extra money get a Vaquaro.
Resale value is not good on the modified Cibola, sad to say, as you don't know who did the mod................
It won't matter to doing the mod, if the Cibola was a cheap buy, willingness to accept a non functioning unit on a bad mod and can take the loss, chalk it
up to a bad experience and move on.

Tesoro doesn't care one way or the other, they will be happy to fix your detector for a price over and above the cost of $50 to just look and do a simple repair.
Bet they would love to sell you a new circuit board for $300 or so.

At least Tesoros are tinkerer friendly, for some.

I agree. If you can't afford for it to be broken, leave it to the professionals.
If I would have paid anywhere near full price, I probably would have used it as is.
But mine turned out ok. Most likely a glitch pot which I'll replace laterm if it doesn't test correctly on the meter.
You can definitly screw some stuff up!!

 

[amberjack]

well its better than a lot of TV shows I watch

I recon headphones pull me up although if I had the right tools and someone with experience to show me sure I would be having a go.

but as it stands I have neither and so its much cheaper to buy a V.

what I do want is a Tesoro made using high quality moon parts or like hi fi gear top of the line parts.

now that's something I would like

it sure would be an experience using a detector made with the best parts on the planet

now if you don't mind I am off to get one of these big ones out not looking forward to it really.

glad all's well that ends well.

AJ

 

[Stoof-tabsallday]

well its better than a lot of TV shows I watch

I recon headphones pull me up although if I had the right tools and someone with experience to show me sure I would be having a go.

but as it stands I have neither and so its much cheaper to buy a V.

what I do want is a Tesoro made using high quality moon parts or like hi fi gear top of the line parts.

now that's something I would like

it sure would be an experience using a detector made with the best parts on the planet

now if you don't mind I am off to get one of these big ones out not looking forward to it really.

glad all's well that ends well.

AJ

If I was buying new, it would have been the V.
This one I accidently bid on while bidding on my Bandido and Noone outbid be for 2 days I guess. Then I got an email. Paid less than silver ųmax price.
If I would have bought new (which I would have just gotten the v or outlaw) I wouldn't even try it.
But I digress. It beeps I disc up just for fun to try and guess, then back down to above iron, X to pinpoint (or use pinpoint if the model has it) then dig.
I had a go today with my relic. Lots of trash where hunting and that detector makes it worse because it will go over 12" down to find it even dime size pices of aluminous :-/. Haha that ring isn't that far down!!!
So I think for now, I'll use my tesoros, then later go back over with the relic for the deeper stuff and what I misses with the concentric tesoros.
Still fun, but wow. Found an oil filter from what looked like a bus. Rusted out, but still had oil in it!!! Haha. Even the tesoro would have seen that hunk o junk that far down
Now that I'm off for summer semester, after work and the gym I'll try to hunt daily. Really get some alone time with my detectors.
Nokta relic gonna get jealous of my compadre.... Funny as that sounds.

 

[Sven]

Have seen such action like this here in a long time.
Happy Hunting.
Put the 5.75" coil on and you'll have a clad, small target tot lot killer.

My mod'd Cibola finds in 2008