Lrl from Italy

[daniel]

Hi Franco.
Thanks for your answer.
I made a double side pcb but i have the upper face connected to gnd, i think there is not problem. I adjusted the capacitors so to have a dc out of 4.1 v but when i touch the antenna the out goes up, don't lowers as you wrote at other thread. Who is your opinion?????

Regards

Have the same problem with LRL2 sometimes it goes in reverse mode. Seems like it has to do with signals around you. To avoid that I turn Pot3 all the way down and only then I power up the cirucit. I wait 10sec for it to settle down.
Now I turn Pot3 up until the LED lights up. Then I turn it a little bit down until the LED goes off. Now I can move around and find my TV in 4 meters distance :-) and LED goes on.

If I go very very near to the TV then sometimes it goes in reverse mode and LED goes out when it finds the TV. Seems like if the signal is to high it switches in reverse mode.

[Geo]

Thanks daniel.
I use LRL3 with other display schematic so i can't try what you say.
Maybe a good box with shield to be a good solution

Regards

[mustefa ubram]

hi franco
please see
The closed circuit opamp non-inverting and And increasing the voltage method.Why in practice it does not work?When the maximum is rv4 voltage output is 10/5 volt .By touching the pin base of transistor2 voltage decreases to 0.5 V.why?I thought that the sense phenomenon on the output voltage increases linearly
What is Duty rv4?Please explain about class opamp?

[FrancoItaly]

Hi mustefa,
I cannot open your file, are you referring to 5Volt modification?
Regards

[mustefa ubram]

Hi mustefa,
I cannot open your file, are you referring to 5Volt modification?
Regards

hi franco
I did not modify to 5volt.I want to change the output voltage from 0 to5
please explain about opamp class and rv4 in this scematic?

[FrancoItaly]

Hi mustefa,
there is an error, pin 2 (inverting input) must be connected to R14 and gain potenziometer and the other side of R14 must be connected to RV4 cursor.
Regards

[Avanturis]

Hello

Hi mustefa,
there is an error, pin 2 (inverting input) must be connected to R14 and gain potenziometer and the other side of R14 must be connected to RV4 cursor.
Regards

Hello Franco !!!!
I built your LRL but not completed, you posted to see if it is built correctly.
I need your help please if you have time look !!!
1 Where to connect the antenna with 70 turns (wire is 0,40mm)?
2. Did is correct (-) polarization of the battery to connect to mass GROUND .... or where to connect?
3. Is there a way to measure the power of electricity for P2 (1-6V) or should be set on the spot where I had buried object?
Please explain to me!!
This is picture

[FrancoItaly]

Hi Avanturis,
The coil antenna or (better) the stylus antenna must be connected to 3 turns coil.
It is correct (-) polarization of the battery to connect to mass GROUND.
All measurements can be performed in the laboratory in the absence of metal buried. The two terminals of the coil antenna must be connected together and only one wire goes to the 3 turns coil, but, I repeat, it's better the stylus antenna.
Regards

[AurumKid]

Hi Franco.
Im from Philippines.
Im curious about your work. which diagram should I build, which is better with stability? the 1st or 2nd with 4066 or the last with xtal? I'm confused

[FrancoItaly]

Hi Aurumkic,
The better, more simple, it's with quarz.
Regards

[Avanturis]

Hi Avanturis,
The coil antenna or (better) the stylus antenna must be connected to 3 turns coil.
It is correct (-) polarization of the battery to connect to mass GROUND.
All measurements can be performed in the laboratory in the absence of metal buried. The two terminals of the coil antenna must be connected together and only one wire goes to the 3 turns coil, but, I repeat, it's better the stylus antenna.
Regards

Thanks FrancoItaly!
Regards

[mustefa ubram]

hi franco.
i made your lrl 8mhz tayp with quartz
I used the output of the micro.I connected to the input adc micro to pin emitter transistor 5.The voltage at the emitter of transistor 5 is 6 volts in standby mode.When touch the antenna decreases the voltage of about 0.5 volts.this is correct?
i used a variable capicator for lc circuit 0-70pf.with change capicator The output voltage change.
I removed the opamp circuit.Micro is able to measure the voltage change of about 1 mV.I used a 4 x 20 LCD. The change is about 1 mV full of a character of 20 characters.I measured with an accuracy of 1 mV to 20 mV change.I think this is a very high sensitivity.
Now I have a question for you:
When the steel antenna sense phenomenon.Whether the output voltage increases or decreases the output voltage as when the antenna is touched?
What level is the change of voltage ?Much more than 0.5 volts or 0.5 volts?

[FrancoItaly]

Hi Mustefa,
When you touch the antenna the voltage decreases with the phenomenon the voltage increases. The level of change voltage may be about 0.5V or more or less, I think it's not critical. By touching the antenna it's a way for testing the lrl. The sensitivity of your micro I think is too much, it's possible you sense the compass effect.
Regards

[v_gh]

Hi, I'm from Iran
I need a good gold detector, one can not help me?

[mustefa ubram]

hi franco
how are you today?
What is the best value for the capacitor?LC circuit?
I used a variable capacitor 0-70p.The output voltage is increased or decreased by changing amount of capacitor.
How to adjust capacitor?The minimum or maximum output voltage?