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It's correct, the important thing is that there are no auto oscillations and obtaining the maximum amplification.
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I greet the members of the forum ...
I ask forgiveness for my English ...
After trying enrolled in forums ...
My turn and I publicly thank Franco to manufacture.
I am an amateur in electronics and maybe I can not give precise information
to the members who they asked me in my email
But I can upload my work and experiments I did and maybe some help ...
my best wishesComment
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I made many boards always 2 pieces to end up in the Franco project with two copper sides of the receiver, but I put the ground at the bottom.
Stis trials I 1 lrl 6 capacitors of C10 from 18p to 47p and a lrl with 12 capacitors
from 18p to 1n to some I caught metals or some of the other nothing.
while at home the signals caught by 8-9 m. the tester to 4-5 meters.
6 capacitors
12 capacitors
my best wishesComment
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THANK YOU
THANK YOU VERY MUCHOriginally posted by PanosP View PostI made many boards always 2 pieces to end up in the Franco project with two copper sides of the receiver, but I put the ground at the bottom.
Stis trials I 1 lrl 6 capacitors of C10 from 18p to 47p and a lrl with 12 capacitors
from 18p to 1n to some I caught metals or some of the other nothing.
while at home the signals caught by 8-9 m. the tester to 4-5 meters.
6 capacitors
12 capacitors
https://www.youtube.com/watch?v=ib72FWjxYTwComment
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Originally posted by PanosP View PostI made many boards always 2 pieces to end up in the Franco project with two copper sides of the receiver, but I put the ground at the bottom.
Stis trials I 1 lrl 6 capacitors of C10 from 18p to 47p and a lrl with 12 capacitors
from 18p to 1n to some I caught metals or some of the other nothing.
while at home the signals caught by 8-9 m. the tester to 4-5 meters.
6 capacitors
12 capacitors
https://www.youtube.com/watch?v=ib72FWjxYTw
Panos P
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Nice PCB design. I like your idea to apply some sort of Manhattan-style board construction.Originally posted by PanosP View PostI made many boards always 2 pieces to end up in the Franco project with two copper sides of the receiver, but I put the ground at the bottom.
Stis trials I 1 lrl 6 capacitors of C10 from 18p to 47p and a lrl with 12 capacitors
from 18p to 1n to some I caught metals or some of the other nothing.
while at home the signals caught by 8-9 m. the tester to 4-5 meters.
6 capacitors
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You have right to self-defence!
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Good Work
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I experiment with ferrite 20 c.m antenna coil, the signals inside the house the best I caught but nothing out goals, like a piece 5 c.m the tag coil, centering best, but cuts the distance.
I'm still in the experiments.
my best wishesComment
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Who can tell us, the machine will react on metals? Why use 8 m crystals? If for 20 m crystals, can it work? thank youComment
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Hi liudengyuand,
Lrls react on long buried non ferrous metals, better on gold and silver but with too much gain react also to "compass effect", ie it has a signal when the LRL is aligned with the north / south. My lrl works in the range 2.5Mhz - 10Mhz and it is not necessary to change.
The oscillator provides a carrier that is somehow modulated by the "phenomenon", perhaps even works with 20MHz changing but some component, but then again it's not important
Best RegardsComment
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OK
thank youComment
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Hello, francoltaly,thank you for sharing this project, I made it, as there is no suitable element, all I use bc547 triode, c1 with no 390 pf, I use 470 pf, its capacity is large, whether to have impact on circuit? I have a dc voltage measurement ic1 3 feet, 6.08 v, the voltage is normal? It is not sensitive to electric spark, I use mobile phone call, it can detect 80 cm interference signal, then how can we know its sensitivity is the best? Please reply, thank you very muchComment
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Hi liudengyuand,
with "dc voltage measurement ic1 3 feet, 6.08 v" do you mean the 7412 IC output? In this case there is an error, with 18V (input from the battery), the output (of course) has to be 12V. All transistors of the type BC ... C are suitable. As for C1 the original value in the diagram is 330pF but other higher values are fine if the oscillator is stable, I recommend a lower value and maybe increase it. As I mentioned earlier the only test needed is to touch the antenna and check whether the output voltage decreases (even a few mV). All the other tests do not help much.
Best RegardsComment
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Hello! Yes I measured voltage c18 is 6.08 v, I no problem of supply voltage of 11.25 v, for electric spark, it is how far distance should be sensitive? And the use of capacitance, whether to need to use the capacitance with black points? The 6.08 v is normal, please?Comment
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