Lrl from Italy

[sakher]

hello Mr.franco
Should we take into consideration the Frequency of the erea and set the device frequency?

http://www.longrangelocators.com/for...1&d=1395622350

[FrancoItaly]

Originally Posted by sakher

hello Mr.franco
Should we take into consideration the Frequency of the erea and set the device frequency?

http://www.longrangelocators.com/for...1&d=1395622350

I cannot help you, there is no particular frequency of operation, my lrl works in the FM range, about 90 - 130Mhz but it is not linked to any radio broadcaster, Esteban said that even an FM receiver (not tuned to any station) could work as lrl.

[darkman]

HI ALL ,,
what is the best antenna for good resort ? coz my lrl does not respond to the test field .
note : my test field is a gold ring 14k , 2 grams , 30cm depth , 2 years .
output 5.355 vdc , respond to mobile signal , when i touch antenna the output = 5.325 .
i used 0.5pf In a place C2,C3,C4 . C1=470pf.
regards ..

[FrancoItaly]

Originally Posted by darkman

HI ALL ,,
what is the best antenna for good resort ? coz my lrl does not respond to the test field .
note : my test field is a gold ring 14k , 2 grams , 30cm depth , 2 years .
output 5.355 vdc , respond to mobile signal , when i touch antenna the output = 5.325 .
i used 0.5pf In a place C2,C3,C4 . C1=470pf.
regards ..

The values are correct, I think you have read the helps. what still needs to be established is whether the gain is sufficient. To verify this, increase the gain until the compass effect appears, then decrease it until it disappears. Try R1= 69K, R2 = 100K, P2 = 1M.
The best antenna for me it's stylus that which can be extended up to 60cm with increased sensitivity.

[abdou2014]

Franco LRL modified

[HaFar2010]

Hello
Dear Franco.
I have a main question about results of you LRL. Do you think, beside buried non-ferrous metal, it's also possible to detect nugget?

[FrancoItaly]

Originally Posted by HaFar2010

Hello
Dear Franco.
I have a main question about results of you LRL. Do you think, beside buried non-ferrous metal, it's also possible to detect nugget?

I think yes, but I have not experiences.

[Milad.salsa]

hi mr franco
when i touched the anttena voltage was increased،my circuit is ok?

[FrancoItaly]

Originally Posted by Milad.salsa

hi mr franco
when i touched the anttena voltage was increased،my circuit is ok?

Yes, the important thing is a change of amplitude.

[toorani]

hi franco dear
Thank you very much for your great work
Thank you very much for your plan
I built your circuit,I tried to make your pcb ,I attached the following layer to the ground And I used philips bc550c transistor,
But I do not know why with the touch of the antenna, the output voltage (the emitter tr5) does not change (it does not decrease).
What should I do to test the correctness of the circuit?
By changing the capacitors c2, c3, c4 and c13, c14 and c1, the output voltage does not change.why?
The values of the transistor base voltage are as follows:
tr1 e=3.34 volt b=3.98 v c=11.01 v
tr2 e=0 b= 0.57 v c=8.66 v
tr3 e=0.45 v b= 1.03 v c=9.15 v
tr4 e=0.51 v b=1.09 v c=8.88 v
tr5 e=2.35 v b=2.93 v c= 11.33 v
Is this true?
Thank you so much Franco dear



http://s9.picofile.com/file/83196669...9_20_31_58.jpg

http://s8.picofile.com/file/83196668...9_20_32_49.jpg

http://s8.picofile.com/file/83196672...9_20_32_45.jpg

http://s8.picofile.com/file/83196673...9_20_32_40.jpg

[FrancoItaly]

Originally Posted by toorani

hi franco dear
Thank you very much for your great work
Thank you very much for your plan
I built your circuit,I tried to make your pcb ,I attached the following layer to the ground And I used philips bc550c transistor,
But I do not know why with the touch of the antenna, the output voltage (the emitter tr5) does not change (it does not decrease).
What should I do to test the correctness of the circuit?
By changing the capacitors c2, c3, c4 and c13, c14 and c1, the output voltage does not change.why?
The values of the transistor base voltage are as follows:
tr1 e=3.34 volt b=3.98 v c=11.01 v
tr2 e=0 b= 0.57 v c=8.66 v
tr3 e=0.45 v b= 1.03 v c=9.15 v
tr4 e=0.51 v b=1.09 v c=8.88 v
tr5 e=2.35 v b=2.93 v c= 11.33 v
Is this true?
Thank you so much Franco dear



http://s9.picofile.com/file/83196669...9_20_31_58.jpg

http://s8.picofile.com/file/83196668...9_20_32_49.jpg

http://s8.picofile.com/file/83196672...9_20_32_45.jpg

http://s8.picofile.com/file/83196673...9_20_32_40.jpg

Its possible that the lrl is self oscillating. Detach the quartz and controls the voltages again. TR2/TR3/TR4 collectors are to high, it must be about 5-6V, try 820K or 680K for R6, R8 and R11. Follow the instructions of my helps.

[toorani]

Originally Posted by FrancoItaly

Its possible that the lrl is self oscillating. Detach the quartz and controls the voltages again. TR2/TR3/TR4 collectors are to high, it must be about 5-6V, try 820K or 680K for R6, R8 and R11. Follow the instructions of my helps.

Thank you very much for your guide

[toorani]

hi franco dear
I Detached the quartz and controls the voltages again ,But the voltages are the same as before. try 820K or 550k for R6, R8 and R11,But voltages vary by about 0.2 volt.
What is the reason for your opinion?
Thank you very much for your guide

[toorani]

Originally Posted by toorani

hi franco dear
I Detached the quartz and controls the voltages again ,But the voltages are the same as before. try 820K or 550k for R6, R8 and R11,But voltages vary by about 0.2 volt.
What is the reason for your opinion?
Thank you very much for your guide

In my opinion, this will fix the problem by increasing the resistor of tr1, tr2 and tr3 (r7, r9 and r13).Is that right?
Or r6, r8 and r11 resistance should be very low

[FrancoItaly]

Originally Posted by toorani

In my opinion, this will fix the problem by increasing the resistor of tr1, tr2 and tr3 (r7, r9 and r13).Is that right?
Or r6, r8 and r11 resistance should be very low

When you remove the quartz the TR5 emitter must be zero, if not it means that the sensor stage is self oscillating. If this is the case you must decrease C13/C14 (470pF or 390pF or less).

[toorani]

hi franco dear
i remove the quartz and i decreased the capacitor c13 and c14 to 50pf but the voltages are still the same as before,It has only dropped by about 0.4 volts.
Also, the r6, r8 and r11 resistances are 550 k ohm
In your opinion, where is the problem?
Thank you very much for your guide

[FrancoItaly]

Originally Posted by toorani

hi franco dear
i remove the quartz and i decreased the capacitor c13 and c14 to 50pf but the voltages are still the same as before,It has only dropped by about 0.4 volts.
Also, the r6, r8 and r11 resistances are 550 k ohm
In your opinion, where is the problem?
Thank you very much for your guide

Surely there is a self-oscillation. This is the operation of the first version of my lrl. Touch the antenna and check if the signal varies. If so, if the signal is stable, the lrl works equally this way. To decrease the gain increases R10 / R12 (1.5K or 2.2K). Self-oscillation can depend on a parasitic coupling of the pcb and / or the excessive gain (beta) of the transistors.

[toorani]

Hello franco dear
By touching the antenna voltage dc out( emiter tr5, it is about 2.3 volt) It does not change at all.
I set the resistance of r10 and r12 to 2K ohm, but the collector voltage increased by about 0.2 volts.
Thank you very much for your guide

[abdou2014]

[FrancoItaly]

Originally Posted by toorani

Hello franco dear
By touching the antenna voltage dc out( emiter tr5, it is about 2.3 volt) It does not change at all.
I set the resistance of r10 and r12 to 2K ohm, but the collector voltage increased by about 0.2 volts.
Thank you very much for your guide

I confirm that there is a self oscillation, the pcb is better double sided, with lower side connected to ground. Try also transistors type BC...B (lower beta than C type).

[abdou2014]

happy birthday Mr Franco

[FrancoItaly]

Originally Posted by abdou2014

happy birthday Mr Franco

Thank you so much.

[toorani]

Hello dear franco
I hope you always be healthy
I found the problem circuit,Tr2 transistor was faulty.
The collector voltage is now: tr2 2.8 volt ,tr3 4.5 volt, tr4 4.5 volt
why the collector voltage tr2 is 2.8 volt?
Without the quartz, the output voltage is zero(emiter tr5) and with quartz is 4.1 volt
signal Emitter tr1 is 8 Mhz 2.4 volt pic to pic,Of course capacitor c1 is Two parallel capacitors 560p.
capacitor c13 is 200 nf and c14 is 100 nf but why The output voltage does not exceed 4.1 volts?
capacitor c2,c3 and c4 is 1.8 pf

Thank you very much for your guide

[WM6]

Originally Posted by toorani

I found the problem circuit,Tr2 transistor was faulty.
The collector voltage is now: tr2 2.8 volt ,tr3 4.5 volt, tr4 4.5 volt
why the collector voltage tr2 is 2.8 volt?

Interesting PCB construction toorani. New PCB Art design.

Better than Manhattan style PCB construction. Bravo.

An easy way to put TR with wrong pin orientation on it too.

Did you checked well before power on?

..

[toorani]

Originally Posted by WM6

Interesting PCB construction toorani. New PCB Art design.

Better than Manhattan style PCB construction. Bravo.

An easy way to put TR with wrong pin orientation on it too.

Did you checked well before power on?

..

hi Mr wm6
I originally plugged the pin collector- Emitter incorrectly But I've corrected it now.

Thank you very much for your guide