TESORO GOLDEN SABRE

[kt315]

Yet another toxic post from you.

Why?

leave it please out to go on my personality now. WITHOUT 'TOXIC' и прочие измышлизмы с твоей стороны.
я пишу ОШИБКА и указываю ГДЕ ОШИБКА. непонятно? - пиши в личку.
сам смотри - РЕЖИМ ПО ТОКУ транзистора в генераторе даже на взгляд ненормальный!
логичнее 4.7к а не 47к!

[Nandor]

somebody (iwkonik?) losted the decimal point.

Yet another toxic post from you.

Why?

[Nandor]

Mr Jaick

Don't even waste your time if you cant understand a simple Colpitts oscillator. This topic is not bad information! You are lazy to read and cant make a real PCB.

People here arguing with you are wasting there time also, explaning to you some really obvious things, many of us made several TGSL by the info posted here, if you are not able to make it work than it's your problem not others!

[ivconic]

Royal ............... 47k
---
i learned Royal good because GMT king cobra is same. you write that do not know.

[ATTACH]49360[/ATTACH]

Be a sport, waste just 2 minutes of your precious time, change your 4k7 with 47k and see what happens.
If supplied with 8 volts and than if supplied with 5 volts. 12 volts in your case.
Use oscilloscope and analyze the signal amplitude.
Than continue to be a sport just for 2 minutes of your precious time more and inform us here about your revelation.
Many thanks in advance!

[kt315]

Royal ............... 47k
---
i learned Royal good because GMT king cobra is same. you write that do not know.

[ivconic]

yeah that is a standard type colpitts oscillator
now i'm going to change things to default and see if there'd be any differences (hopefully) i'll come back with results
but i have a question : how a transistor colpitts oscillator would oscillate at 16Vpp by using +8V supply??
that's pretty strange to me...

Do you have oscilloscope?
Can you tell the difference between DC and AC?
Do you understand the "Vpp" meaning?

[ivconic]

W. Lahr NEVER made mistake on this, period.
Each diy that i made according to his retraced schematic; works alright from the first switching On.
W.Lahr is rock solid!
Why is this difference?
Due different voltage supplying the oscillator, simple as that.

[Mr.Jaick]

"...Of course RX measures the same Freq since it simply Receives the TX. exactly my knowledge says the same thing but in that guide it says the rx tank should oscillate at about 16.1 khz!..."

Presuming that you check RX coil by connecting it at TX coil place. Than you'll see the different frequency, of course.
As for "mistake" made by William Lahr; there is no mistake at all.
At various Tesoro designs you'll see the same resistor vary from 4k7 to 47k.
At Bandido is 20k. Etc.
By strange coincidence i am having one TGSL on the bench right now.
I replaced 47k with 4k7 and i don't see any difference in behavior. Works the same.
2e coin detects at same distance in both cases. Disc, GEB, everything works perfectly smooth and same in both cases.
At the same time there is Bandido II uMax on the bench, with 20k on the place. Works just fine.
So?
If you pay too much attention on KT's rubbish; you'll get nowhere, that's for sure.
I saw part of the schematic you posted and i see dramatic changes in TX stage!?
What the heck you did there man?!
(rhetorical question)

yeah that is a standard type colpitts oscillator
now i'm going to change things to default and see if there'd be any differences (hopefully) i'll come back with results
but i have a question : how a transistor colpitts oscillator would oscillate at 16Vpp by using +8V supply??
that's pretty strange to me...

[ivconic]

walter
Don Bowers' schematic has fatal mistake in TX colpitts oscillator. look on my right sch of Cobra and you will see R3 is NOT 47k -!
(R10)
somebody (iwkonik?) losted the decimal point.

Short retrospective from most of the schematics available:

Bandido II .......... 20k
Bandido II uMax ..... 20k
Cutlass II .......... 20k
Cutlass II uMax ..... 20k
Amigo ............... 47k
Aztec ............... 47k
Cibola .............. 24k
Compadre ............ 47k
Conquistador ........ 47k
Deep Search ......... 47k
Eldorado ............ 47k
GMK cobra ........... 4k7
Golden Sabre ........ 47k
Golden Sabre Plus ... 4k7
Golden uMax.......... 47.5k
Inca ................ 47k
Pantera ............. 47k
Royal ............... 47k
Sidewinder .......... 47k
Silver Sabre ........ 47k
Tejon ............... 20k
Toltec .............. 47k
Toltec II ........... 47k

[ivconic]

"...Of course RX measures the same Freq since it simply Receives the TX. exactly my knowledge says the same thing but in that guide it says the rx tank should oscillate at about 16.1 khz!..."

Presuming that you check RX coil by connecting it at TX coil place. Than you'll see the different frequency, of course.
As for "mistake" made by William Lahr; there is no mistake at all.
At various Tesoro designs you'll see the same resistor vary from 4k7 to 47k.
At Bandido is 20k. Etc.
By strange coincidence i am having one TGSL on the bench right now.
I replaced 47k with 4k7 and i don't see any difference in behavior. Works the same.
2e coin detects at same distance in both cases. Disc, GEB, everything works perfectly smooth and same in both cases.
At the same time there is Bandido II uMax on the bench, with 20k on the place. Works just fine.
So?
If you pay too much attention on KT's rubbish; you'll get nowhere, that's for sure.
I saw part of the schematic you posted and i see dramatic changes in TX stage!?
What the heck you did there man?!
(rhetorical question)

[Mr.Jaick]

walter
Don Bowers' schematic has fatal mistake in TX colpitts oscillator. look on my right sch of Cobra and you will see R3 is NOT 47k -!
(R10)
somebody (iwkonik?) losted the decimal point.

thank you very much i will check that again i am hopeful
btw i used 0.25mm wire for both coils and get 14.57 khz for tx and 13.9khz for rx both in tx circuit(my retarded design)
so is there any problem with it?

[Mr.Jaick]

A bread board may have too much stray C. It should work somewhat.
I prototyped the TX oscillator on a PCB prefboard and that worked first time. I use this to test coils looking for the frequency they oscillate at.

Prototype just an oscillator and check each of the RX & TX coil on the same oscillator circuit as Dbowers recommends in his 101.pdf. The RX & TX coils need to oscillate at a difference of about 550Hz.

i've done this but not working

The one I built has about 16Vpp output.


I used the EDU schematic which is the same as in Don's 101.pdf but simply bought that PCB from SilverDog.

https://diydetector.co.uk/store/index.php

the pcb and schematic are same i've already checked

Of course RX measures the same Freq since it simply Receives the TX.

exactly my knowledge says the same thing but in that guide it says the rx tank should oscillate at about 16.1 khz!

There is a whole sub-forum on the TGSL here:

https://www.geotech1.com/forums/forumdisplay.php?18-Silver-Sabre-Bandido-TGSL

i've read a lot of information about this particular subject on here but still i'm a fool

Lots of post about getting this circuit going.
It is one of the easiest VLF circuits to build but still has many subtle pieces that must be correct.

thank you for your attention guys , i did't expect to get some answer from expert people any time soon

[ivconic]

227 pages,
5 653 replies,
1 039 663 views !!!




And still you are asking for "any info" !???
In same time you trying to make detector on perfboard without proper coil !??
Complaining in advance?
I mean... C'MON!!!
You're just used as "fuel" for usual KT's rants and rubbish that he posted all over the place, polluting each possible topic on this forum.
... pushing you to buy pcb from ebay... as usual.

[Mr.Jaick]

my pcb and schematic for tgsl:

[Mr.Jaick]

thank you kt315
i will check this out but any further information about this?
for coil making and setup...
i need to design the pcb myself since i'm not in Russian