Golden Mask 3+ (GMD 3 plus)

[rheingold]

Hi everyone,

recently I got hold of an older model (> 4 years) of a "Golden Mask 3+" detector which seems to need some tuning.
Therefore I am looking for a circuit diagram of this machine.

This VLF / IB detector has a TX booster and boasts with a tank circuit voltage of up to 120 Vpp.

For a more precise identification / comparison here are some close-up pictures:

Thanks a lot in advance !
"rheingold"





The Outer Appearance




Opening the Box




PCB Backside




Complete Circuit




Connectors pulled




PCB (with booster mounted)




Booster PCB Backside




PCB detailed (without booster)






Local backup of the images (part 1 of 4):

[rheingold]

Local backup of the images (part 2 of 4):

[kt315]

run to http://www.md4u.ru/viewtopic.php?f=94&t=5512
but you have to googletranslate from russian.
sch and etc, i do not follow whole thread so find up you need.

your photos are PERFECT and ABSOLIUTELY nice example how to do for all geotechers.

[rheingold]

Local backup of the images (part 3 of 4):

[rheingold]

Local backup of the images (part 4 of 4):

[kt315]

send me pls all those pics on my email [email protected]

tia

[rheingold]

@kt315:
Thanks ! I've accidentally come across your post about making good PCB pictures.

Unfortunately the russian schematic seems pretty different from the photographed detector:
Maybe it's an early version of a standard GM3 or some 'prehistoric' model.

Key elements are missing like the "IRF 540z" power MOSFET of the booster circuit
or the potentiometer for adjusting the frequency.

It features also a pretty interesting audio frequency modulation (VCO), at least for my ears,
and a quad-op-amp "BA10324AF", which I haven't seen elsewhere so far.

[kt315]

got it! thank you lots.

[kt315]

maybe noone knows there is a seller with GM4 PRO/PRO VD boards selling. it is sure full copy.

http://www.md4u.ru/viewtopic.php?f=31&t=10843

[gando]

I have a gm3 + and I would like to know the values of the internal potentiometers and what they are for.
can someone kindly help me?