Fisher Gold Bug 2

[nelson]

Hi to all

Today i found a Fisher Gold Bug 2 for sale. The machine cost about U$750 in the USA. Mine will cost me U$300 here in my country.
Of course is a used unit, but in very good shape.
So for now i need your comments about this machine, cause i need it to hunt gold nuggets.
Also i need the schematics of Fisher Gold Bug 2
In advance many thanks

Regards

Nelson

[nelson]

Max, Ivconic and all friends, i need the Gold Bug 2 schematic

Hi again. Has i posted before, yesterday i got Fisher Gold Bug 2.
The unit is looking has new one it have only some minor scratches that will not afect performance at all.
Now i m looking for schematics of this unit, so if anyone can help i will be very regardless.
The idea is to redraw the circuit and share it with the forum, so any extra information will be very helpfull.
Regards
Nelson

Hi to all

Today i found a Fisher Gold Bug 2 for sale. The machine cost about U$750 in the USA. Mine will cost me U$300 here in my country.
Of course is a used unit, but in very good shape.
So for now i need your comments about this machine, cause i need it to hunt gold nuggets.
Also i need the schematics of Fisher Gold Bug 2
In advance many thanks

Regards

Nelson

[Max]

Hi again. Has i posted before, yesterday i got Fisher Gold Bug 2.
The unit is looking has new one it have only some minor scratches that will not afect performance at all.
Now i m looking for schematics of this unit, so if anyone can help i will be very regardless.
The idea is to redraw the circuit and share it with the forum, so any extra information will be very helpfull.
Regards
Nelson

Hi Nelson,
I have this... don't know if yours is different.

Kind regards,
Max

[nelson]

Hi Max and thanks for the schematic of Fisher Gold Bug.
Indeed it will help me a lot, while is not Fisher Gold Bug 2, can give me an idea about his tech.
I m also planing to run this machine with one acid battery, instead of those two 9 volts batteries that are also expensive. Any ideas on how to do this.
I have a 12 volts 1.2 amp battery, but i need to run with 9 volts.
In advance many thanks
Best regards and best whishes on that TGS test. Mine is working fine and is also paying for it self while i found losts of coins.
Nelson

Hi Nelson,
I have this... don't know if yours is different.

Kind regards,
Max

[Max]

Hi Max and thanks for the schematic of Fisher Gold Bug.
Indeed it will help me a lot, while is not Fisher Gold Bug 2, can give me an idea about his tech.
I m also planing to run this machine with one acid battery, instead of those two 9 volts batteries that are also expensive. Any ideas on how to do this.
I have a 12 volts 1.2 amp battery, but i need to run with 9 volts.
In advance many thanks
Best regards and best whishes on that TGS test. Mine is working fine and is also paying for it self while i found losts of coins.
Nelson

Hi,
it's easy... some ideas:

1. Use a 7809 regulator... you'll get 9v well stabilized and just add two capacitors of 470-1000uF at input and output to filter ...nothing else needed.

2. Other solution... use an LM317T in voltage regulator config... use a trimpot to set 9V output.

3. Other solution... put in series a 3.1V zener diode (catode of zener to + lead of battery)... then the anode of zener is your + output lead (about 9V)depending on current need by circuit you have to use 1/2W or 1W zener diode. Problem is that voltage at output follow drop at battery.

The first is really easy and effective cause you want use it with lead-acid battery so you can search many hours before battery voltage drop under the dropout level (3volt dropout so...about 12V at input) of regulator. With battery fully charged you'll get about 12.7v or more... so more than enough to get it work.

If wanna use at lower battery voltages you have to use LM317T or a low dropout regulator like KA78R09CTU or TA78DL09AF.

Best regards,
Max

[strujas]

Hi Nelson can you split with us your impressions abouth gold bug 2, and which are the differences with schematic posted by Max?
Regards

[nelson]

Hi Strujas.
Well, about Gold Bug 2 schematics and GB diferences, i can tell too much jet, cause i haven´t the time to do so. Anyway, searching a net i found that GB2 and GB are diferent.
My GB2 is working very good if is used for finding small metals. Ground Balance is excellent, i have tested on riverbanks, desert, hills and always i can ground balance with no problem, while i can do it with a 16 position switch and a vernier adjustment.
Deep is good to for very small metals. I do not recomend it for coing shooting.
It has a fixed discrimination, so it can be adjusted . This is one of the things i ll like to modify, to have a varible discrimination, like Tesoro Golden Sabre has, so if anyone knows how, please post it here.
I only have the standard coil, so i can said more about performance with a bigger or smaller one. I also will like to construct a coil for it.

In conclusion, a good machine for what it was made.
I also know a guy from New Mexico, who use GB2 a lot for finding meteorites, with very good results. He said is one of the best MD.

I hope this can help.

Regards

Nelson

Hi Nelson can you split with us your impressions abouth gold bug 2, and which are the differences with schematic posted by Max?
Regards

[strujas]

I was thought that gold bug can be useful for Roman gold tremises becouse they are very small, and them is very hard to find with other md, unfortunatly i am not efficient jet for constructing md's, I can ask Ivconic for advice, He is very good in that, and Max are too!

[strujas]

Nelson, does your gold bug 2 have pin point?

[nelson]

No it does not have a pinpoint, but you don´t nedd it, cause it has a variable thresthold, so you can adjust the pitch while you are searching. In other words, this i s like having a pinpont active all the time, while keeping the detectrs performance on.
In your case, if the coins are not buried more than 15 or 20 cms. i think it will be fine. GB2 is a very sensitive machine for finding the smallest metal on earth.
Regards
Nelson

Nelson, does your gold bug 2 have pin point?

[nelson]

Hi Max.
Yestarday i was looking schematic your previusly send it to me. Gold bug 2 is diferent from gold bug.
What i ll like to know if is posible to add a varible discrimination to gold bug 2. This model has from factory a fixed discrimination.
So if you or anyone can help, i ll be very happy.
I m also traying to know how to open gold bug2 case. At first look, seems that i must remove the front panel, but i m not shure of that.
Regards.
Nelson

Hi Nelson,
I have this... don't know if yours is different.

Kind regards,
Max

[liekwang]

hi max if you have to board layout according scema you sent me fhiser unbelievably cool and good to want to build a gold nugget affection for fisher bug pcb board to the underside and top of anyone on this forum that I need to have her thanks all sorry english I translate

[Laz]

Send my schematics for gold bug 2 . [email protected] . Thanks

[Tim]

Hi Max and thanks for the schematic of Fisher Gold Bug.
Indeed it will help me a lot, while is not Fisher Gold Bug 2, can give me an idea about his tech.
I m also planing to run this machine with one acid battery, instead of those two 9 volts batteries that are also expensive. Any ideas on how to do this.
I have a 12 volts 1.2 amp battery, but i need to run with 9 volts.
In advance many thanks
Best regards and best whishes on that TGS test. Mine is working fine and is also paying for it self while i found losts of coins.
Nelson

By the GB schem it uses 9v(bat+),6v(vcc), and 2.5v(vdd), which are sourced from the 9v. I would be wary about the GB2 though. The 2x9v suggests to me it may use 9v+. 0v, and 9v-, making a single 12v unsuitable. Perhaps ICL7660/LT1054 and 7809 and 7909, as per Baracuda schem would work?.
As the GB2 is a current model I am reasonably sure the schem is not available, or at least would not be published here. However it may be similar voltages, just with the second 9v for sound, or extended usage time.
2x9v Alkalines at Woolworths here $5. Not really a prohibitive cost.
Yes, a very good machine, as its ongoing manufacture suggests.
I too would be grateful for a PM/email containing this schem for personal use.
All the best.