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#2
08-13-2012, 08:53 AM
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What i see......
555 works at 44Khz. Problem is around the BC548. BC548 with 290uH and 16.8 nf parallel to coil is tuned at 72.1 Khz... The 68 Ohm resistor is so low compared with the Z of the tuned circuit, so i believe that the capacitor 100nf who is connected at the collector of the bc548 must calculated as a 100nF parallel to the other 2 capacitors (16.8nF). So with inductance 290uh and 116.8 nf capacitance the transistor is tuned at 27.34 Khz. So we have 3 different frequences that don't match.... Your opinion??? 
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Geo 
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#3
08-13-2012, 10:12 PM
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Quote:
It also works on MHZ frequency of garage door openers. Maybe it does not matter if the transmitter circuit is efficient or not. For a hand-held version which can make an FG90 to beep from 2 meters distance, I think you do not need a 555 for oscillator, and do not need a ferrite. The battery can be a computer cmos battery at 1.5 volts. So the hand-held version can be much smaller... the size of a coin. Best wishes, J_P
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#4
08-14-2012, 04:46 AM
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Hi J_P.
The schematic that i attached is the schematic that robalocarapanda put at "Mineoro website" thread. I want the opinion of technicals about the frequency that it is tuned. If really use it to make a stronger field from the object then need more power than the small size that you say. Regards
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Geo
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#5
08-14-2012, 04:45 PM
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my friend the electronic say , the frequencies are from 52khz to 90khz in fg80 , fg90, and others and 110 kHz to tesla
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#6
04-18-2013, 12:07 AM
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MINEORO FRAUD
Quote:
this message is for all LRL skeptics and LRL adepts. our friend robalocarapanda is under atack by MINEORO,who said for him to remove the video MINEORO FRAUDE,or he will sufer the consequences for difamation ,in justice. see the video and coments by MINEORO : http://www.youtube.com/watch?v=RzG4n5BMYS8 lets give our suport to robalocarapanda if he need , I THINK THERE ARE MANY PEOPLE IN THIS FORUM NOT SATISFIED WITH MINEORO PRODUCTS, THE CLAIMS FROM MINEORO NOT CORRESPOND TO THE REALITY LETS PUT OUR OPINION IN YOUTUBE FOR MINEORO TO SEE ROBALOCARAPANDA IS NOT ALONE !
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#7
08-14-2012, 08:39 PM
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Quote:
I also think it is not necessary to have a well-tuned circuit to make a Mineoro locator beep. I saw in Carl's post where he said it would beep at his electric fence, and I read how it would beep at a garage door opener transmitter that broadcasts over 400 MHz. I also read where it will beep when you press on the brake pedal to a car to make the brake lights turn on. This makes me think that it is not important what exact frequency the transmitter is tuned to or even if it is not tuned. We can see from the Mineoro circuits that it has a broadband receiver which will pick up nearly any RF noise from the air. After everything I have read, My opinion is Alonso did not waste much time calculating the proper inductance and capacitance for any particular frequency. I think he made a transmitter using parts which he thought were in the approximate range that would work, then checked to see if he heard beeping from his transmitter. When he heard beeping, then he probably decided he was done building the transmitter. He only needed to put the transmitter in a plastic bag to protect it from moisture, and it would to the job to make beeps, so nobody would know the hidden gold was stolen. There is no technical information which says this is a correct circuit, because it is not a technically correct circuit. In order to make a technically correct circuit, you would first need to know exactly what frequency the FG90 is most responsive to, then design a transmitter to produce that frequency, and test it to insure it is at the correct center frequency. However, this is not a practical approach when you are in a hurry to steal a buried gold target far away from your laboratory. I believe that if this particular oscillator was transmitting at 50% higher or lower frequency than what the measured frequency is, then it would still cause the FG90 to beep. I think Alonso knows that the exact frequency is not important, so he did not waste his time to tune to a precise frequency. I think Alonso knew that mis-matched parts would work ok. If he didn't hear any beeps, then he could always add a few more turns on the coil, or change the 555 resistors until he did hear some beeps. Any attempt to analyze this particular circuit could be easily considered a waste of time, because we can already see it was a sloppily built transmitter that was not designed for any kind of optimization, but rather to provide a quick and dirty solution to cause beeping that would focus at a particular location. But, of course, what I believe could be wrong. Maybe he tuned this transmitter to very precise frequency in his laboratory with calibrated instruments long before he made any field trip. Who knows? Hope that helps Best Wishes,  J_P
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#9
04-04-2013, 10:38 PM
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Alonso apparently did this transmitter to use only an harmonic frequency and not a fundamental Frequency. 27.34 maybe is an armonic frequency of 82 khz and this is the freq that Alonso use here and maybe the transmitter work well Do you understand me, no? LRLMAN.
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