Chech Sabre modified

[ZdenekHQ]

X14, PCB A, "aku vybity" is connected to PCB B, K2, pin "signal aku vyb"

AM/FM is really not used, so dont place part U100 and parts with index 100 and more around it.

Coils - end of TX coil is connected to begin of COMPENSATION coil, end of COMPENSATION is connected to "last turn" for final compensation of coil. All of it is TX coil and is connected to TX oscilator (PCB A, X3 and X4). RX coil is connected to RX pre-amp (pcb A, X1 and X2). If you want external pre-amp, so make same RX pre-amp as U8 and parts around and place it everywhere you want (for example 30cm from coil on holder).

Tuning - find R7 on pcb B and add Dt1(yellow). Then break link between R7 and pin 3 U4-A on pcb B and add R7-A (blue). Then cut off R21 and add same rezistor between point R7/C11/Dt1 and +8V.

[ZdenekHQ]

Green is signal from amplifiers, blue is classic comparator with only R7 etc, red is "tuned" comparator. It is used for tone alarm, with blue you are listening noise, with red you are listen only clear tone or silence.

[tiktak]

Hi,

Hi,
Thanks.
I am curies did you thuning audio and disc too?Compared to original TGS design?
Because I have trouble detecting halves of horse shoes!!!!
I mean arent they IRON?I should DISC them!!!
Damn last time I have digg 100 of them with my TGS!
And how you use this notch?I have never learned to use them too?Is this some advanced version?
And this multitone?When I swtch to 2-tone I can use one<low>for Iron and the other for good stufs?And when I switch betwen 2=tone and 3=tone I have in one mode 2 tones and in other 3=tones aveilable at same time?
For the wiering I were interested in this groud part!I conect the coils shield to cable shield and buy taking buxe shield it goes to batt-!And what signal is going trought the wires shields?And where are they conected,so you dont need ground balance?
Thanks again man!!!!!

[tiktak]

Hi

Hi,
ZdenekHQ !
Why you dont answer to my questions.I havent time lately but now when I looked at tread I have noticed that you havent post soon.?

p.s.I am almost ready but I have used the PCB from your site that is with all parts but now when I omitt those that you have tell me it have funny look.Maybe when I have time I will try making some changes.
Thanks

[ZdenekHQ]

Wait a few moments (I am not sure how long is moment in your country :o) ), I have too much work now and you have many asks... I had some troubless with internet connection last few days too.

[tiktak]

Hi,

Hi,
Dont get angry my friend!
I were just curries.No bed feelings.I never ment to push you.


I am very greatefull that you help me.

[ZdenekHQ]

About discriminiation - I dont know, which metal is used for "halves of horse shoes". I thing it is noble steel and it is not ease to discriminiate. But I will try to check it, may be notch filter is way to be warn of it and dont digg it.

For 2-tone is used same setting as for notch filter - you are listening basic tone for all metals "under" notch-level, and second tone for metals "over notch-level". Its working as second discrimination channel, you can set it - for example - Fe + alu-foil is basic tone, other is second (high) tone. You can combine it with all-metal/discriminination switch.

3-tone - low tone for metals "under" notch (e.g Fe, alu-foil etc)., second tone for metals "inside" notch filter (notch-level, notch-width potenciometers), third tone for metals over notch-filter. But it not work very well in ground, there is many wrong signals on edge of setting, it need any digital filtering for better work, so I solve it with my Sabre Digital now.

[ZdenekHQ]

About cable - you cannot use shield of cable for any signals, beacause if you are using shield of cable for example for "ground signal" of TX coil, than your cable is component of TX coil and participant of ground capacity effect with your body, ground etc.

You must use shield only for shield and it is connected to ground of detector and shield of coils.

If TX is grounded, use separate wire. May be it is sound stupid to use shield cable for grounded wire, but dot forget one thing - there is small voltage loss on "ground wire" of TX and ends of shield and ground wire is NOT on same potencial inside coil. This is particulars which makes from your average detector better detector.

[tiktak]

Hi

Hi,
thanks.
But I still cant understand how this is going to be acompished!
I actualy never used NOTCH filter on field walks.
So I have only teoreticel basic impresions.
I have made the original PCB for TGS.
But now as far as I can see you have make it a brand new machine.
I bought 2 switches with 3 positions on-off-on and 3 legs behind.
And for modes switch.It automaticly turn off all m /disc when PP is activated or this is made with the switch/galete/itself?

[ZdenekHQ]

When PP is active, another function is automaticly switched off (see PCB B : SW5 and VT1 - it closes VCO DD1 and activate VCO DD2). I used two VCOs for simpler apprehension.

Notch filter is super for rejecting "unwelcome", but non-Fe metals, for example brass projectile(cartridge), which I have full bucket (from WW2). You must experimentaly and slowly set NOTCH-LEVEL to point, where is no sound for this metal. NOTCH-WIDTH is currently set by the middle.

[ZdenekHQ]

Notch filter picture : yellow area is metals, which is detected (e.g. hlinik(Al) and med, stribro (Cu, Ag) ).

"slitiny medi" - brass - is rejected - red (notch) line

"zelezo" - Fe - is rejected by basic discrimination (green line)

[tiktak]

Hi

Hi,
How are you?
Thank for the info!I begin to get the picture.When I use NOTCH on my device I can achive the same.Right?But with my there is no sound at all and with TGS ADVANCED I have lower tone?And now I will be able to reject those boring jar caps?Is the sound better now?
How is TGS DIGITAL?Have you finish it?
Did you have PCB without omited parts?

Thanks

I gues that wether is bad now too and you wont post soon.

[ZdenekHQ]

Im afraid I cannot tell you, if you can reject specific metal or no - it is determined primary by your coil. If you have bad coil, discriminiation and notch filter working roughly. Sabre Advanced using full-wave synchrodetector, it is better than original TGS and it have effect on discrimination, it working better. You can use your notch/multitone to listen low tone for specific metal, but you must modify schematics diagram.

Sabre Digital is now made on experimental PCB, I will spend many hours to write good software, I have about 2300 lines now and it seems I will need over 5000 lines for basic functions of this detector. Its all about my leisure time and about money (unfortunately). It is not cheap hobby.

All my construction is engineered with some "provision for future", so every time you must count with some useless parts on PCB or with adding another parts for better function. It is impossible to made so complicated system without any mistakes.

[tiktak]

Hi

thanks.
I am glad that you help me so much.
I will draw a picture of wiring and will post it here,so you can revise.Ok?

but you must modify schematics diagram.
How?

I have only a few?'s left

[tiktak]

Hi

Hi,
Sorry for the ugly picture but I will remake it!
Please check.