Wanted : Tesoro LOBO

[Max]

Hi all,
does anyone have the tesoro LOBO schematic to post ???
Seems that have a better iron rejection compared to other tesoro's...

Best regards,
Max

[Reg]

Hi Max,

I am not sure why the Lobo would have a better iron rejection. I found the sensitivity to be less and ultimately modified the unit and ended up eliminating the first filter.

Reg

[Max]

Hi Max,

I am not sure why the Lobo would have a better iron rejection. I found the sensitivity to be less and ultimately modified the unit and ended up eliminating the first filter.

Reg

Hi Reg,
many thanks for the schematic. I'll study it in some spare time. I found bandido I've made is a good machine though there are some limitations and want to study disc and geb in tesoro's serie of uMax detectors. I really don't know if Lobo is better than bandido in disc stuff like rejection of iron...just saw many positive posts on other forums that talk about it as a good coinshooting machine.

Thanks. I really appreciate.

Best regards,
Max

[porkluvr]

missing component value

Hey, Reg:
Thanks a bunch for the Lobo schematic. I glad somebody had the patience and presence of mind to reverse engineer one of these. Lately I've been trying to analyze the Tesoro "system" and this is a big piece of the puzzle (to get twisted over).

I'm not complaining, but there is an area in your drawing that is not complete, and I'm wondering if you made more sense out of the circuit than what I can make from your drawing. The thing I can't get past is the value of the resistor between the transmit transistor's collector and opamp pin 6 (shown parallel with 51pF). I am not familiar with a configuration like that and so all I can do is guess whats there - but that area appears to be critical to phase set-up so I don't want to guess.
If you can get back, great. If not, no sweat.
Thanks, and GOOD JOB!!

[porkluvr]

There it is

Ah-haaa, now I see!! Please disregard my previous post. The opamp circuit follows (or more corectly, is predecessor to) the same basic Discriminate circuit topology as Bandito, with component values designed to work at twice the input frequency!! The resistor marked "SEL" would be optional, no? No need for explanation, here. This is good!
One minor thing: the LM392 comparator's pinout (used for All Metal) is shown with reversed input pin-numbers, (assuming that "+" and "-" designators are shown correctly, and further assuming that my data sheet is OK).
Thanks, REG!

[Max]

Ah-haaa, now I see!! Please disregard my previous post. The opamp circuit follows (or more corectly, is predecessor to) the same basic Discriminate circuit topology as Bandito, with component values designed to work at twice the input frequency!! The resistor marked "SEL" would be optional, no? No need for explanation, here. This is good!
One minor thing: the LM392 comparator's pinout (used for All Metal) is shown with reversed input pin-numbers, (assuming that "+" and "-" designators are shown correctly, and further assuming that my data sheet is OK).
Thanks, REG!

Hi,
yes was a nice work you can see pretty close design as in bandido...but also some differences...lobo is a good machine expecially for gold nugget hunters and coinshooters too !
I'm still watching for differences in geb/disc and there are some...cause at Tesoro they made different implementations of these for different detectors...though not big differences but important for sure (e.g. phase rejection range).
THANKS AGAIN REG !

Best regards,
Max

[porkluvr]

dumb

One minor thing: the LM392 comparator's pinout (used for All Metal) is shown with reversed input pin-numbers, (assuming that "+" and "-" designators are shown correctly, and further assuming that my data sheet is OK).
Thanks, REG!

Wrong. It was the LM393 doing duty as ground phase reference that has two pin numbers mixed up - not that it's worth mentioning twice, or even once for that matter.

Now, if I could just figure out why Tesoro makes all metal work with inverted phase sense on this detector and some others, but not on the Golden Sabre... . Nope, not that one.

It's late again -duh. outa here