Fisher 1266 PART 2

[kt315]

good night, aft.
not.
why do you yourself not wish to ask vel the circuits? I have wrote that I do not access to forum because my nick was baned. if you have access you can ask anybody.

truly

[aft_72005]

Goodmorning KT315,
I wrote a email to two address that you gave me it .
([email protected] and [email protected].)
I don’t haveing reply form veltex yet.
Also I am not registered at MD4U.RU because I cannot comunicat with
Others in russain language.
Best regards.

[kt315]

good day, aft. no problem. copy this text and then paste.

привет. прошу выслать вашу схему Фишер-1266 в формате Protel. спасибо заранее.

[hi, please send schematic of F-1266 in Protel. thanking in advance]

all the best

[aft_72005]

KT315, also I wish you having gooddays, also thaks for you
Guide, I try it.
Best regards.

[kt315]

you are welcome. I found this photo in a forum. it seems like Fisher 1266 clone. look on the transformer. maybe it is same. can anybody give me details what detector is on the photo? part list?
http://i37.tinypic.com/1z685k3.jpg

[amtech2005]

Fisher 1266 Part 2

Beautifull photo , that sure looks like the gold-century clone from China . I wish there were more pictures . I am searching to see what GC model it is again . I think something was posted by Sean a few weeks ago on this model so I will check again . After cloning , a very good metal detector for the money !!!.............Eugene

[Qiaozhi]

Beautifull photo , that sure looks like the gold-century clone from China . I wish there were more pictures . I am searching to see what GC model it is again . I think something was posted by Sean a few weeks ago on this model so I will check again . After cloning , a very good metal detector for the money !!!.............Eugene

Recently Sean was discussing the MD3030, but it's not that one in the photo. The 3030 uses SMT.

[ivconic]

It is 3009...same crap as 3030. Look TGS thread, i told a story there...

[amtech2005]

Fisher 1266 Part 2

Ivconic, I put a response over on TGS thread . If it is a 100% correct circuit "clone" of a good metal detector design , than the chinese made search-coil is not correct and is 100% garbage !!!! ............Eugene

[KingJL]

1266 vs 1265

Does anyone know the differences between the 1266 and the 1265. I have searched high and low, but cannot find any discussion of the differences. There is some discussion of clones and whether they are clones of 1265 or 1266. I am inquiring about the differences between the 2 real deals, not clones.

Regards,
J. L. King

[Eugene52]

Fisher 1266 PART 2

Hello KingJL , I see differences so they are not identical !!! Here are both schematics and I did some work with the1265x so it is clearer now than any copy I have ever seen , I hope !! .............Regards...........Eugene

[KingJL]

Eugene52,
Thank you for posting the 1265 schematic. The 1266 schematic you posted has numerous errors (power supply, bat test area, and some of the analog switch signals. Also 1266 has 4016 and 2 4066's not 3 4066's). I have traced these out from the original 1266 schematic (extremely hard to read because of image quality) and comparing it to the 1266 PCB. From looking at the 1265 schematic, it looks as if there is very little difference between the 2 models. I will do some more in depth comparison of the 2. But for now, my question is answered; They are almost the same (near enough that I would be happy with either)!!!

Thanks again,
KingJL

[Eugene52]

Fisher 1266 PART 2

Eugene52,
Thank you for posting the 1265 schematic. The 1266 schematic you posted has numerous errors (power supply, bat test area, and some of the analog switch signals. Also 1266 has 4016 and 2 4066's not 3 4066's). I have traced these out from the original 1266 schematic (extremely hard to read because of image quality) and comparing it to the 1266 PCB. From looking at the 1265 schematic, it looks as if there is very little difference between the 2 models. I will do some more in depth comparison of the 2. But for now, my question is answered; They are almost the same (near enough that I would be happy with either)!!!

Thanks again,
KingJL

Hello Again , I see the 1265x has a 10 turn ground balance , I did not see multi-turn on 1266x schematic. Glad you pointed everything out . I recommend everyone save a copy of the 1265x and trash the copy of 1266x !!!!.........Thank-You...............Eugene

[KingJL]

I recommend everyone save a copy of the 1265x and trash the copy of 1266x !!!!.........Thank-You...............Eugene

The 1266 in your post is totally unreliable (not your fault!). Besides the things that I noted in a previous post, it has inconsistancies in ground references vs what should be -4v. A correct schematic for the 1266 is attached to this post. It is an earlier version of the 1266 and does not have the MPS13A's in the feedback loop of the U301 and U302 amplifier sections (but that is easy to add). The schematic is extremely hard to read but is clear enough to compare to the 1265 schematic. I see a small difference in the sensitivity control circuit. Between the 2, all questions should be answered.

[KingJL]

It appears as if the main difference between the 1265 & 1266 is added circuitry in the sensitivity control, addition of MPSA13 if feedback of U301C and U302D, upgrade of some components (TLC27M9 in place of 27M4, LT1007 in place of OP27? for preamp), twice the gain in the preamp, (~333x vs ~145x). I think the most significant difference is probably the LT1007 preamp with over twice the gain. That might be a worthwhile upgrade to a 1265 (You need to change the gain resistor and the series capacitor as well)!! If I made that mod, I might go ahead and add the sensitivity circuitry and the MPSA13 feedback mods as well.

Regards,
J. L. King