Magnetostriction metal detector

[rael]

This ultrasonic metal detector, utilise magnetostriction resonance of metals.

K174XA34 (TDA7021) - FM radio circuit.
DT1 - 128uS Delay line from VCR.
Piezoelectric transducers BQ1 & BQ2, are mounted on two 2kg (4.4pounds) steel plates, separated with rubber.

Electromechanical filter frequency:
A1, 3245 kHz - Al
A2, 3872 kHz - Cu
A3, 4731 kHz - Fe
A4, 5278 kHz - Ag
A5, 5521 kHz - Au
A6, 5722 kHz - Pt

[strujas]

Where are you from Rael?

[aft_72005]

Hi rael
Are you built it?

[rael]

Where are you from Rael?

... Student City, Sofia, Bulgaria, Europe, Earth, Solar System, Milky Way Galaxy, ... /42°38'**N, 23°1*'**E/

[rael]

Hi rael
Are you built it?

Hi, aft 72005
Not, I never try this.

[aft_72005]

Hi real
Is it LRL?
Lrl gold prospectors used 5-5.5 KHZ frequency .
Is it relation between this two ?
Are you known really at frequency 5521KHZ, gold pieces will be resonance?
Regards.

[rael]

Hi aft 72005,

Not, it is Short Range Locator. For walls, floors and other solid stuffs.
I think, LRL and Magnetostriction frequencies have different origin. No relation between this frequencyes.
If iron pieces will be resonance, gold pieces will be resonance too.
In my opinion this it Bulgarian translation from Russian design.

Regards

[Esteban]

A5, 5521 kHz - Au

Hi Rael,

In text I read 521 Khz, maybe is wrong in the text.

I understand blocks A2, A3, A4, A5 and A6 are similar schematic to A1 block, except difference values in L3 and L4???

Regards

Esteban

[kt315]

RAEL, it was such joke. by magazine 'RADIOLIUBITEL'. you may be in course may be not... April 1 is Joke Day (I believe it is international Joke Day), but all April is also a month of joke. it was issued in #4 of the magazine.

you can simply delete the clip.

yours always
315

[R A E L]

Spam in Geotech!

This is serious publication from Bulgarian magazine.


I have problem with acount.
RAEL

[kt315]

you have been warning. but anyway, you have full right to repeat this schematic
good luck

[R A E L]

Sorry for the thread, KT315 is too quick.

RAEL

[humhum]

RAEL, mojeli da mi pokajes originalnia link na tazi shema, ili ot kıde go vze stoto lipsva nyakoi danni za shemata.

[rael]

RAEL, mojeli da mi pokajes originalnia link na tazi shema, ili ot kıde go vze stoto lipsva nyakoi danni za shemata.

humhum,
Tова е копие на статия от "Електрон Дайджест", благодарение на KT315 се разбра че е превод от руското списание "Радиолюбител".
Уверявам Ви, че не съм скрил данни за схемата, не ги търсете и в "Радиолюбител". Това е шега, по никакъв начин няма да проработи.

RAEL
____________________
Long live Cyril & Metody

[humhum]

RAEL ako e shega zasto dadohte tazi shema kato cheli ste raboti. Tazi shema nyamali da raboti, i zasto e dal chastotata na zlatoto kato cheli raboti. İli ti znaesli kakva chastota tryabva da davame na zlatoto zada ni uveryava obratno.