Tesoro Eldorado on the bench

[ivconic]

Agree...
Yes i finished it but havent tested yet...to much other things to do.. I guess tomorrow i will have preliminary results..

[Eugene52]

Tesoro Eldorado on the bench

Ivconic , I am looking forward to the Eldorado test results .............and also I hope you have a Great Christmas and a Happy , Healthy , Prosperous New Year !!!!.........................Regards.............. ...Eugene52/amtech2005/Stalni-Clan

[ivconic]

Tested. Works very good. I havent made center tapped coil yet. Tested with TGSL 27cm coil. In Disc mode works out of range but in All Metal mode works excellent... better than expected! 1e coin at 28cm in air. Both modes; motion and non motion works excellent. I noticed much better "depths" in air in non motion mode!? With GEB pot adjust good GEB and than with treshold make just about to hear mum sound. Than it can detect coin over 40cm in air. Larger item like 1l paint can is detecting over 1meter in air! In non motion mode audio is very,very pleasant, joy to hear it. This one will definitelly replace TGSL for good. I am very satisfied.
Now is time to make center tapped coil....

[nelson]

Congratulations Ivconic.
You are the genius on tesoro MD´S
What can i said, excellent.
Marry Christmas and happy new year to you and your family.
Kind Regards
Nelson

Tested. Works very good. I havent made center tapped coil yet. Tested with TGSL 27cm coil. In Disc mode works out of range but in All Metal mode works excellent... better than expected! 1e coin at 28cm in air. Both modes; motion and non motion works excellent. I noticed much better "depths" in air in non motion mode!? With GEB pot adjust good GEB and than with treshold make just about to hear mum sound. Than it can detect coin over 40cm in air. Larger item like 1l paint can is detecting over 1meter in air! In non motion mode audio is very,very pleasant, joy to hear it. This one will definitelly replace TGSL for good. I am very satisfied.
Now is time to make center tapped coil....

[Ultimate_Haze]

Excelent work.
Once again you bring wonderful design here.
But can you give some additonal informations.
Like what is this retune buton for?
Also the disc,sens and tresh all have only one wire to PCB?
Thanks

[porkluvr]

Ivconic, would you please post a copy of the schematic that you are working from?
I have an Eldorado scat that I have cleaned up and it looks pretty, but it sounds like you have made some changes to the circuit that wouldn't appear on my drawing.

Thanks!

[ivconic]

Aint not major changes...just omited battery test and amplitude stabilizer in TX stage. Also i couldnt obtain LF442 and LM308 at the time, so TL082 used instead (just in testing purposes). BF245 are fets, also BC327&337 used there instead 2N2907&2N2222. I added another 1N4148 to further "furbish" those 3 transients from 4024....not a big deal, but i spoted minor improvements on scope...
Also i found out 30p and 47K instead 100p and 10K to be right values on original Eldorado..that is all..

[ivconic]

Excelent work.
Once again you bring wonderful design here.
But can you give some additonal informations.
Like what is this retune buton for?
Also the disc,sens and tresh all have only one wire to PCB?
Thanks

RETUNE and AUTO are the same, with difference that AUTO presents locked retuning (switch) and RETUNE is only one shot push button.
Ha,ha,ha...of course not. There are 3 x pins on pcb for disc,sens and tresh. I just pointed their places with single line, of course you must use 3 wires
GEB multiturn pot need 2 wires...

[ivconic]

Nelson many thanks, but i am far for being any kind of genius. I am just great enthusiast. Once i get interested for some project, i am involving all my time and love to make it right and if possible to improve it more.
All the tributes should go to Tesoro guys who designed this at the first place...
Best regards!

[Ultimate_Haze]

Hi,
I were shore for this but still confused about right arangment.But I will find it out.Anyway I were studying this design and it look prety good.I will try build it this days.
Have you tested with centretaped?

[ivconic]

Not yet. Waiting coil enclosure to receive, and some wire too. Looking forward.

[porkluvr]

Also i found out 30p and 47K instead 100p and 10K to be right values on original Eldorado..that is all..

That, is major! Thanks, dude!!

[Friday]

Hi...
Eldorado is relic hunter so I am going to make it...
Thanks a lot İvconic and all friends...

Happy new years....

[Friday]

Hi ivconic...
Is this scheme right?(sign place)
Is it BC337 or 2N2222?(maybe omited) and did you make tapped coil?



Regards...

[?????????]

eldorado

hi
eldorado is wonderful detector.it haves auto tune.
ivconic good job...I will try its...
good luck