Mineoro 2-Box -- 492 feet range?

[brasilpb]

oscilloscope adjusted to vertical scale 10mv / div

[abdou2014]

I don't know, i have n't experience on it.
Before years two friends said me that they measured it and was a small drift.
Maybe at 100Khz 50...100Hz, i don't remember exactly

Thank you

[Geo]

Hello Brasilpb.
Can you measure the signal at emmiter and collector of first transistor???

[zakari]

hi brasilpb
thank you so much.
best regard
zakari

[brasilpb]

Hello Brasilpb.
Can you measure the signal at emmiter and collector of first transistor???

I already closed the device, but the signal on the emitter will theoretically be practically the same as on the base, the signal from the collector will be much higher but it is not used.

[brasilpb]

[Geo]

Exactly Geo, I believe that you can improve its operation in order to work better as a long-distance detector, reducing the power of the transmitter and further lowering the amplitude of the oscillating coil, in order to detect signals of much smaller amplitudes, now it remains to know how to design an oscillator that generates a sine wave of a lower amplitude than that of the miner, which in this case was 75mvpp, I think that if we could design one with an amplitude of only 5mvpp, and increasing the gain of the pre amplifier circuit in order to be able to detect this signal later, we would have a very efficient long-distance detector, remembering that the power of the transmitter at the back would have to be reduced so that the receiver and oscillator coil would be only about 5mv as well.

Hi.
The signal of buried metals or the phenomenon modulates the signal of oscilator and the diode demodulate it, so the signal of oscillator is not problem. I have see similar techniques where the signal at base is 150.. 200 mv so the 75mv of this oscillator is very good.
You must adjust the transmiter right so to works as stimulator coil...

Regards

[aft_72005]

Hi brasilpb
Thanks for your data . please upload TX circuit too
Regards .

[liudengyuand]

yes

[folharin]

hello brazil pb!!l! how did you measure 65khz????

[folharin]

what measurement method did you use?

[brasilpb]

I used an oscilloscope and a frequency meter to read the frequency correctly.

[brasilpb]

https://i.ibb.co/3vz4kBW/transmissor-mineoro-08mi.png

[abdou2014]

65khz or 60 to 70 khz has low penetration underground , you need VLF range

[shahrayar]

What is special about this scheme?
Just like BDK