Lrl from Italy

[taxma1981]

From lrl franko i use this circuit

[taxma1981]

It is important the LC circuit to tunning to a radio station of your area

[nelson]

Thanks taxma. So you did 8 mhz stage, plyus an amplifier stage, correct?

thank you very much, and of course I want to share the circuit, it is not secret ..
I do experiments on two receivers and I see differences, the circuit I made is the crystal 8 mhz, another that also works well is one battlfield laser detector with the difference that at the entrance we have a crystal oscillator as well as the same circuit Lc Franco ..I am not my good acquaintances but like doing experiment

[taxma1981]

Thanks taxma. So you did 8 mhz stage, plyus an amplifier stage, correct?

I do not understand well, I mean that this project with an oscillator and the circuit lc Franco WORKED ..
Can someone fix it properly the changes;

[ouiarabe]

From lrl franko i use this circuit

Thank you for your cooperation taxma1981, but personally I did not understand exactly what you did.
is what you have modified the schema Franco Italy or what ????

[taxma1981]

Franco's plan does not hurt, it works

[abdou2014]

Mr taxma , can you share with us your PCB

[nelson]

Hi Taxma.
What i mean, if you build just franco 8 mhz circuit, or you build it with an extra circuit or amplifier to allow it to get more sensitivity.

Franco, can you tell us if you understand what did Taxma to the circuit, is there another stage that allows it to get the signal from far away?
Ina advance many thanks
Nelson

I do not understand well, I mean that this project with an oscillator and the circuit lc Franco WORKED ..
Can someone fix it properly the changes;

[FrancoItaly]

It is not very clear, but surely this is not only my LRL, I think that the operation key is Tr2, where the "phenomenon" interferes with 8MHz signal which is then amplified.

Best Regards

[taxma1981]

Hi again and sorry for my englisch,
the additional circuit is not for the circuit of Frank..it is for the circuit battlfield lazer detector...this circuit with a crystal oscillator and a LC circuit working well.....

[pigeon]

pcb

Hi again and sorry for my englisch,
the additional circuit is not for the circuit of Frank..it is for the circuit battlfield lazer detector...this circuit with a crystal oscillator and a LC circuit working well.....

hi taxma


you can forget your pcb.

thank you

[taxma1981]

today i throw away and the two receivers, it is not possible to work one day and then not do anything ...

[pigeon]

thank you

today i throw away and the two receivers, it is not possible to work one day and then not do anything ...

[darkman]

after a year of trying

hi franco , and all
i removed the quartz and changed c13+c14= 7.4nf, until i got 0.04v DC on output . then i get back the quartz to the Bord and replace c2,c3,c4 with 6.6pf , i got 4.7 volts on output .
when i move my hand near the Bord the output volt drop up to 6 vdc .
in stand by mood :
tr2 collector = 4.7 vdc .
tr3 collector = 4.9 vdc .
tr4 collector = 5.3 vdc .
tr5 Emitter = 4.7 vdc .
L1 is 3 terns 1cm diagram with 22pf on c10 , i used 25cm to 1m of stylus antenna .
note: when i Touch the antenna the output volt jump from 4.7 vdc To 5.6 vdc . (but in test field the first led is off ).
* 2 days ago i went to test field , i got 400 grams of Yellow and red copper buried for 3 month's , 30cm depth , but without any Result , the lrl are not Responds >>
what did u think franco , where is the problem ?

[FrancoItaly]

Hi darkman,

The values seem correct, the correct value of sensitivity is a bit less than the beginning of the compass effect. Have you tried this test? If you are unable to have this effect means that there is not enough amplification. This is confirmed by the fact that you are using 6.6pF for C2, C3 and C4, typically this value is about 1pF. Also for the gain of the stage it is the rule that maximum gain is before the stage starts to self oscillate. Controls the gain of TR2, TR3 and Tr4, beta must be 500 or higher, try to lower the value of R10-R12 from 1K to 560 ohms or less. Of course there is also the possibility that the buried metal not issue the "phenomenon."

Best regards