Lrl from Italy

[mustefa ubram]

franco
Does putting batteries in this way creates pores in the boxes in the works?

In general, the power supply does not need a separate box or differences?

[abdou2014]

Can I put bc548c or BC549c for ( Tr2 - Tr3 - Tr4 - Tr5 ) in place of bc 183c ?

[mustefa ubram]

Can I put bc548c or BC549c for ( Tr2 - Tr3 - Tr4 - Tr5 ) in place of bc 183c ?

no abdou2014
bc548 &bc549 is low gain transistor but bc183c is hi gain transistor

[dream_man]

Hi dear Mustefa ;
I've seen your Cristal 8 MHz PCB and faced to some questions. What are the components which I mentioned by the red lines in the below picture?.. one of them is L7812 regulator, but I dont know the capacitance of the rest of components.
Thanks for your contribution my friend.

[mustefa ubram]

Hi dear Mustefa ;
I've seen your Cristal 8 MHz PCB and faced to some questions. What are the components which I mentioned by the red lines in the below picture?.. one of them is L7812 regulator, but I dont know the capacitance of the rest of components.
Thanks for your contribution my friend.

hi freind
I hope you have understood correctly mean.I have specified the amount of three capacitors
best wish

[dream_man]

Thank you dear Mustefa for you fast and supportive reply. How about your results?.. have you achieved any good outcome using this 8MHz cristal circuit? ...

[dream_man]

Dear Mustefa, I think you forgot to draw the place of 3 turns filter on the board. Please locate the place of the filter if it is possible.

[pigeon]

hi freind
I hope you have understood correctly mean.I have specified the amount of three capacitors
best wish

hi all friend
how I can fix the antenna and the choke coil

can i use bc237 in place bc183


thank you

[mustefa ubram]

Dear Mustefa, I think you forgot to draw the place of 3 turns filter on the board. Please locate the place of the filter if it is possible.

Dear friend . There is LC circuit board.I have identified.Be careful
I never could I tested the device in action.Because I had no real purpose.

[mustefa ubram]

hi all friend
how I can fix the antenna and the choke coil

can i use bc237 in place bc183


thank you

You can not do not use the choke.Because you need to tune the resonance frequency.


Maybe you're using the bc237. Should be tested in reality.But need to hi gain.Choose high-gain transistor.bc183c Is good.

best wish

[dream_man]

Thank you Mustefa, But real purpose is rare and as Franco said we must test it by at least 2 months buried metals.

[dream_man]

hi all friend
how I can fix the antenna and the choke coil

can i use bc237 in place bc183


thank you

Here I reply you by what Franco recommended earlier ;

"The heart of all the LRL is the high gain part consists of TR2, TR3 and TR4; if the gain is too large this part goes into oscillation and it's very unstable, if instead the gain is too low, the phenomenon is not revealed.I use the type BC183C transistors because I own a lot, but you can use equivalent types (BC109C, BC209C, BC239C and so on) the important thing is that they are NPN silicon with high "beta" (suffix "C"). The RF gain of the amplifier,for a certain range of frequencies, depends on the value of C13 and C14, the lowest value = less amplification and vice versa."

"The best antenna is a stylus 80cm-100cm. With 30cm it has the minimum sensitivity, the greater the length the greater the sensitivity. With these changes, it is possible to detect targets that were previously ignored, such as, for example, short time metals buried (1 month or more) in your test field."

Hope it helps you.

[mustefa ubram]

Thank you Mustefa, But real purpose is rare and as Franco said we must test it by at least 2 months buried metals.

Right Franco

[pigeon]

Dear friend . There is LC circuit board.I have identified.Be careful
I never could I tested the device in action.Because I had no real purpose.

hi mustafa

is what you can give me a picture to facilitate
fixing the choke coil and the antenna

thank you very much

[abdou2014]

Mr Franco You Said That "for a certain range of frequencies, depends on the value of C13 and C14, the lowest value = less amplification and vice versa."
what is the maximum value of C13 C14 (for more gain) in remaining in Range of frequency wish ?