Lrl from Italy

[mee]

Osc

Hi all
Oscillator waves output in the oscilloscope not symmetrical if used this circuit for oscillating
Output wave is better
Best regards

[FrancoItaly]

Hi all,
I will post again a few tips that I have given above, I recommend the quartz version, simpler to build and debug. The oscillator is a Colpitts without the emitter capacitor which it has proved not necessary but that you can put in the event that the stadium is not in oscillation. The signal at 8MHz based on TR2 is so small that in practice it is not measurable, it is best to measure the DC output on the TR5 emitter.

Best Regards

[mee]

Tnx

Tanks dear franco
I check it

[pigeon]

nice

Hi all
Oscillator waves output in the oscilloscope not symmetrical if used this circuit for oscillating
Output wave is better
Best regards

[zakari]

thanks alot my dear franco

[dream_man]

Hello dear Franco;
Hope you are well and your face is smiley. Just to inform you, I prepared several tests on my test field which contains of several copper coins in 30cm depth, the circuit revealed nothing, but in my friend's test field which contains more than 1Kg coppers in 1 meter depth buried for several years, your circuit revealed it by 1 LED in 1 meter distance. Hope it's helpful.

[FrancoItaly]

hi dream man,

This is useful, you can try to extend the antenna and raise the gain, in sensor stage and in the display stage.

Best Regards

[dream_man]

Hi. All the changes applied and the result is what I mentioned above.

[sakher]

how i can raise the gain in sensor stage?

[folharin]

Friend dream man, in his project, which color led detected the phenomenon?

[dream_man]

Hi my friend, it depends on what color you use for LED IC1. I mean the first LED connected to IC1.

[FrancoItaly]

Hi sakher,

Look at my helps, if you follow my instructions you will set the stage for maximum sensitivity.

[sakher]

Thank you Mr. Francoitaly

[zakari]

hi dear franco

i made your lrl and i have 5.14v in out put and i touch the antenna voltage drop down only 20mili volt

is this correct ?

thanks for your help

[zakari]

dear franco

first i disconnect the xtal out put was 5.07 and sensor working vice versa i touched the antenna voltage drop up to 5.1v then i decrease c13 to 470pf and c14 to 390pf out put was been zero and connect the xtal c2=c3=c4=1pf

out put voltage is 5.14v now

if i touch the antenna voltage decrease to 5.12v

is this correct or no?