ARADO 120 SCH& PCB

[ANDREAS]

Hi all
All you have heard for "Myth " arado120.
I make this two years ago, with fine results and new design PCB . This machine has voice for all metals and Ameter for discrimination. With this method, we can heard a detection target and with eyes, we can see dicrimination
Here is sch diagram without errors and full analytical PCB (101,60mm X 81,28mm) without errors too. The next post i publish infos for (how make Tx-Rx coil). My machine work with O-O coils 20cm diametre and detect a euro 36cm distance on air, a box 20cm X 20CM 95cm distance on air . Maybe with D-D coil is better... we want try for this. In practice never i use, only inside laboratory. Easy make PCB, with easy coils and difficult calibration "null".
I don't answer questions, why I believe this is very analytical, only you want make PCB.. put parts and finish
In next post I will present photo's, Method of calculations coilsand method calibration "null"
I wish good success
best regards
Andreas

[nakky]

ANDREAS,thanks.

Grt Nakky

[detectoman]

thanks brodhy andreas for files, the arado is old but in any things superior to modern tegnologies

[mindfree]

Thanks ANDREAS!Looks interesting.
Waiting for your next post.

[ANDREAS]

If you want have "excellent" results, you should be manufacture coils with fine resonate - tune.
For this MD, you don't need at first step osciloscope, only a Freq-meter.
The "magic" frequency for this MD is oscilator work 4680Hz.
How we can this frequency of work?
Diametre Dcoil between 15-30cm is fine for this MD
Now a example. You have a form for make Dcoils diametre 25cm.
Put in this form 200turns copper-wire diametre 0,28-0,35mm. Diamtre copper-wire is not critical, but you cannot use <0,28 or >0,35. Now connect C19-Tx coil your Freq-meter. You see freq-meter example 3400Hz. You start now abstraction turns from Tx coil. In one point example -36turns you see Freq-meter 4680Hz. Thats all.
Only you should be know, how much turns abstraction, because the RXcoil should be have this formula. RXcoil(turns)=Txcoil(turns)+45turns. With this method, you have two excellent Dcoils for this MD
I think you understand well all steps for make easy this coils
best regards
Andreas

[WM6]

Very well Andreas. Exemplary of how to look good presented project .

You do not try to put RX coil in resonance (RXcoil(turns)=Txcoil(turns)+45turns.)?

Here some view on original (taken from web):

[Esteban]

Hi Andreas

Very nice work! I know Arado and this machine works great! I use it and is a very decent machine.

[ANDREAS]

Very well Andreas. Exemplary of how to look good presented project .

You do not try to put RX coil in resonance (RXcoil(turns)=Txcoil(turns)+45turns.)?

Here some view on original (taken from web):

Thank's WM6
My English is very bad and i cannot explain you, why must be use this formula. Only a example, maybe for this understand me.
If we find example Txcoil= 120turns then we must use 120+45=165turns from Rx coil.
Ofcource we must find C for RX coil for fine resonate. The formula use only from Arado Coil and new calc LC from receiver.
Fine machine for full modifications

[ANDREAS]

Hi Andreas

Very nice work! I know Arado and this machine works great! I use it and is a very decent machine.

Thank you Esteban.
I don't forget this original schematic you sent me, if I remember well before three years.
Yes great machine, but i make use only laboratory
Now i think is time to make modifications for this. I am old man, only i "see", what can make new members with this machine
best regards
Andreas

[WM6]

My English is very bad and i cannot explain you, why must be use this formula. Only a example, maybe for this understand me.
If we find example Txcoil= 120turns then we must use 120+45=165turns from Rx coil.
Ofcource we must find C for RX coil for fine resonate. The formula use only from Arado Coil and new calc LC from receiver.
Fine machine for full modifications

Thanks Andreas

I understand your formula, no problem.

I am only interesting at which resonate frequency your RX coil is tuned?

At the same frequency as TX coil, mean 4680Hz, or a the other frequency?

Is this correct: resonate f RX = resonate f TX = 4680Hz?

[ANDREAS]

....
Is this correct: resonate f RX = resonate f TX = 4680Hz?

Yes you are correct Rx coil resonate 4680Hz +/- 50Hz maximum.
You have long time explain this.
Very simple machine, very difficult coil housing, but... fantastic results
best regards

[WM6]

Very simple machine, very difficult coil housing, but... fantastic results

Probably predecestor of Nexus. Thank you.

[ANDREAS]

Two photo's

[WM6]

Two photo's

Nice pictures. Can you measure inductance of RX an TX coil?

[ANDREAS]

Nice pictures. Can you measure inductance of RX an TX coil?

This is not essential. Depending on the diameter coils and knowledge freq-osc
we have different induction for resonate osc-circuit .
Here we want osc work 4,68KHZ
Only we must be try for make out this freq.