I can lower the frequency of the Tesoro Tejón to 14 Khz.?

[obolo]

Hi everyone


It is possible to lower the frequency to 14 kHz of Tesoro Tejón?
Thank you very much for your help.


Best regards

obolo

[kt315]

you have to find a capacitor C26 setted in generator part and increase its value.
not mine schematic, you have to action on your risk.

[geoscash1]

Looks like C26 is a 1m, can be found to the left of the tx coil L2 on drawing.

[kt315]

Looks like C26 is a 1m, can be found to the left of the tx coil L2 on drawing.

please do not take this schematic as right one. i give it ONLY as the orientyras and do not answer for the consequences
if somebody burn the board.
my suggestion always is - if you do not like some tesoro model, sell it and buy another tesoro.

PS. you alco have to increase C27 on same degree. topicstarter must draw needed part himself and decide what to do.

[obolo]

Thank you very much for your help kt315, just curious today are popular Bulgarian detectors of two frequencies, and is only know if you can apply for a Tejón.

[kt315]

you can apply what you want. only for what?
two frequencies has to be like in ML Eureka Gold. 6,4 - 20 - 60 kHz. it is REAL THREE FREQ-S.

[kt315]

[homefire]

Why would you want to do that ? Gold is better found at the higher Freaks..

[kt315]

gold AND silver. BOTH.

[obolo]

It is more stable in the adjustment of ground, and gives fewer false signs.

[kt315]

http://www.nuggetshooter.com/the-nugget-hunter-2.html

[obolo]

I have not such luck, Spain is not a gold site, But thank you very much anyway.

[Davor]

It is more stable in the adjustment of ground, and gives fewer false signs.

You won't notice that much of a difference. You'd have to change a frequency for about an octave to notice anything. Regarding ground, the only improvement when going with lower frequency is at salty wet soils, but not so much with other types of terrain.

The big story about devices using multiple frequencies is in small difference in target/soil response on each frequency. Those responses are subtracted in a way that ground responses on each frequency cancel each other, and the very difference is your target response. 3 frequencies are simply to obtain 2 or 3 such differences to reject wet salts as well, nothing more.
For all practical purposes, on easy soils a well ground balanced single frequency machine will do just fine.

Having option to tweak frequency a kHz or so on Tejon is advantageous in case of interfering signal, but that's about it. Easy mods stop there.

Say you shift frequency one octave down, by placing 4x larger Tx tank capacitors. You'd notice:
- sound also one octave lower,
- difficulties adjusting GB and discrimination, as phase shifters are not reaching required phase,
- high Tx coil current
- probable loss of coil balance.

Now, all of the above are easily fixed in a home made rig, with through hole components, and ICs in sockets.

Perhaps it will be a better idea to make a new device with lower frequency instead of doing risky surgery on a perfectly working commercial device.

[obolo]

Thank you very much for your extensive and detailed explanation is what I wanted to know.


Regards.