TESORO GOLDEN SABRE

[Esteban]

Schematics for Esteban...and other "skeptics"

Nice! Go ahead!

[Max]

Schematics for Esteban...and other "skeptics"

Nice! Go ahead!

Hi Esteban,

go ahead !?

Oh sorry... I know you like boxes...

but I think that's enough to PI$$ off all of your and others speculations about my electronics (or chemistry?) understanding and about my "practice".

Pull out the hat next time you came here.

Kind regards,
Max

[nelson]

Have you tried TL081 and what were results comparing to LF351?

Regards

Nelson

Hi,
using LF351 seems a bit more sensitive 1-2cm with 1eur coin. No big improvements.

Better if you find the LM308 or a modern full-replacement.

Kind regards,
Max

[Max]

Have you tried TL081 and what were results comparing to LF351?

Regards

Nelson

Already answered Nelson. Gives 1-2cm more on my TGS, DD22 and 1eur coin.

LM308 is better.

Kind regards,
Max

[ivconic]

Lm308

"Very expensive, .... 4.70 Euro.."

****, yes! Here it is 4.9 euros!!! TL081 is 40cents....

I am worrying about my smd pcbs...I put TL082 in those to replace 2 LM308.....So you see, on ordinary pcb i can put LM308 even is expensive, but on smd? What should i put? LF353?
It will "eat" me few days more to find solution!!! ****!

Regards!

[Max]

"Very expensive, .... 4.70 Euro.."

****, yes! Here it is 4.9 euros!!! TL081 is 40cents....

I am worrying about my smd pcbs...I put TL082 in those to replace 2 LM308.....So you see, on ordinary pcb i can put LM308 even is expensive, but on smd? What should i put? LF353?
It will "eat" me few days more to find solution!!! ****!

Regards!

Hi Ivconic,
think that a good smd could be LT1012... as porkluvr suggested, but never tested it so I don't know for sure. Problem is finding it cause LT devices are few used as spare devices, so could be hard to find them e.g. in shops.

Best regards,
Max

[sisco]

Max , for calculate transmitter coil and capacitor I use these formula .

about receiver how ? must use these formula or not ?

and for VLF frequency , can use how frequency ? (between ? KHz to ? KHz)

for example , can use 100KHz or not ?

[Max]

Max , for calculate transmitter coil and capacitor I use these formula .

about receiver how ? must use these formula or not ?

and for VLF frequency , can use how frequency ? (between ? KHz to ? KHz)

for example , can use 100KHz or not ?

Hi,
formula you provided are for an LC resonator. You can use to find resonance freq. at RX.

In GSabre TX osc is a Colpitts one so you need that formula to get tx frequency.

C1 and C2 are capacitors at osc transistor.

Kind regards,
Max

[sisco]

about frequency how ?

[Max]

about frequency how ?

Hi,
Colpitts formula for the TX frequency (signal at TX coil).
LC circuit formula for RX resonance, if you need to know it I mean.

When circuit operates RXfrequency=TXfrequency cause coil is an air-core transformer... but you may have (and in tesoro's is always so) a different resonance frequency at RX LC circuit.

That cause full-resonance coupling is much more complicated to be realized in series, giving reliable results, by factory process.

Kind regards,
Max

[sisco]

about Useable frequency in VLF metaldetector ? (between ? KHz to ? KHz)

[Max]

about Useable frequency in VLF metaldetector ? (between ? KHz to ? KHz)

Hi Sisco,
sorry for the latency,
VLF frequencies ?

To be more technical in theory VLF is from 100 to 10Km wavelenght... that means about from 3KHz to 30Khz.
... in practice anything from e.g. 1-2KHz to e.g. 20 KHz or more... is suitable.

Kind regards,
Max

[sisco]

oh , please Max , for VLF metaldetector what frequency is

better ? (about sensivity , deep ,..)

[Max]

oh , please Max , for VLF metaldetector what frequency is

better ? (about sensivity , deep ,..)

Hi Sisco,
now I understand... you ask which frequency is better to gain sens and avoiding troubles...

First: it's not so critical factor for sens as on can think.

Well any frequency from 5KHz to 15KHz is fine for this, you have big response from foil without a good disc circuits if use higher frequencies e.g. near 20KHz.

At higher than 8-9Khz frequency you gain depth for smaller objects even thin ones, but have more ground and moisture influence. Need a good coil to run ok and a good design too.

At 5KHz operations are often so smooth, relaxing but most depends on circuit used.

I found e.g. Tesoro's really good running at 10KHz (bandidoII) and 14KHz (GSabre)... stable deisgns, cause are good designs! Of course you need also good coils for them.

I think that a detector running at 5KHz can avoid some problems in e.g. simple designs but low freq. is not required if design is good and disc is present.

Another thing to keep in mind is time response of detector that, if motion type, could be affected by a bad design and a low operative frequency.

Kind regards,
Max

[dino]

Golden Sabre

Hello all.... well i have some questions for you guys... i have a original placstic sonde 25cm for DD coils, and im interested if someone can help me with number of coils for RX and TX for Golden Sabre.... i hope someone reply to my request.

Best regards Dino