Lrl from Italy

[Arash]

Complete pcb with antenna amplifier
You can assemble one coil or two coils
I assembled, Sense is better

[FrancoItaly]

Good job, I advise you to mount the sensor stage first and calibrate it and then mount the rest.

[hoshi]

Originally Posted by zakari

thank you very much sir franco

سلام
بدون خداحافظی نمیرفتین
بنده فقط ای دی شما رو اد کردم و به همین خاطر شماره من برای شما نمایش داده شده پس احتیاجی به نگران شدن شما نیست
ممنون از همکاریتون

[Qiaozhi]

Originally Posted by hoshi

سلام
بدون خداحافظی نمیرفتین
بنده فقط ای دی شما رو اد کردم و به همین خاطر شماره من برای شما نمایش داده شده پس احتیاجی به نگران شدن شما نیست
ممنون از همکاریتون

Please read the forum rules -> Basic Rules of the Forums
and make your posts in English.

[hoshi]

Hello
Sorry I wanted to send a private message to this user.
After that I did everything I could not clear this text.

[havoc88]

I 've got a problem with the final version of 8MHz Franco's LRL build by Arash.
I've found a route (part) mistake in LM358 port, that's ok, working perfectly now but my main problem is that the TR5 (Q5 in current pcb) output is 3.15v no matter what i do, with crystal on or not.
I've double checked everything. Resistors, capacitors, nothing.

I upload the part that is wrong in pcb for anyone who made it



Any idea ?

[havoc88]

OK I found the fault, the silk screen in Arash PCB shows reversed every transistor image but marked correctly in pins -> EBC not CBE. I reversed them and now it's working as it should be.

[Arash]

The pcb tested, and making a lot, is fine and works well
Volume is okay, wires need to be properly connected, design is for the volume multi turn, you will replace the wire for the normal volume
It is better for you to read the content written by Mr. Franco

[havoc88]

Mr. Franco and friends.
Everything works perfectly when antenna is directly to base of TR2, it senses electrical signals, compass effect (maybe 99% ) but then, when I connect the antenna to the amplifier makes the detector not working at all (always outputs constant max signal and no effect no matter what) like it overdrives everything. Any clues?

[FrancoItaly]

Originally Posted by havoc88

Mr. Franco and friends.
Everything works perfectly when antenna is directly to base of TR2, it senses electrical signals, compass effect (maybe 99% ) but then, when I connect the antenna to the amplifier makes the detector not working at all (always outputs constant max signal and no effect no matter what) like it overdrives everything. Any clues?

The potentiometer must be adjusted for maximum sensitivity, which often does not coincide with maximum amplification. Too much amplification can cause self oscillation.

[havoc88]

Thank you for your answer Mr. Franco. I think that I may have a npn with too much hfe for the antenna amplifier, I will replace it now. It's the only thing left.

[FrancoItaly]

Very good work, have you tried on the field?

[abdou2014]

vary nice designe bravo !
can you share us the pcb layout ?

[Nicolas]

Originally Posted by walkman

My FrancoLRL-2

Thanks so much Franco

Hi oldest friend my congratulation its better them AKS we have our design here

[Nicolas]

Originally Posted by FrancoItaly

Very good work, have you tried on the field?

Hello Franco yes its tested also its better to AKS thanks friend.

[FrancoItaly]

Originally Posted by Nicolas

Hello Franco yes its tested also its better to AKS thanks friend.

Hello Nicolas how are you?

[okantex]

Hi Walkman

why did you place the circuit and antenna in metal tube

how is your antenna
2 ferrite type?

[Nicolas]

Originally Posted by FrancoItaly

Hello Nicolas how are you?

Hello franco


I m fine thanks only so much busy. how are you oldest friend? I hope you good

[mohsendt]

hello Mr franco


is possible replace ltc6900 with crystal for variable frequency
https://www.analog.com/media/en/tech...ets/6900fa.pdf

[FrancoItaly]

Originally Posted by Nicolas

Hello franco


I m fine thanks only so much busy. how are you oldest friend? I hope you good

I'm quite well, thanks, given the age (68 years), the only drawback is that I have little time to experiment because most of the time I live far from my laboratory.

[FrancoItaly]

Originally Posted by mohsendt

hello Mr franco


is possible replace ltc6900 with crystal for variable frequency
https://www.analog.com/media/en/tech...ets/6900fa.pdf

It is possible, but I think it is not necessary, simply by changing the quartz you get different frequencies. I tried 3/4/6/8/10 Mhz and I think that 8Mhz is the best value, even if with the other values the lrl works well anyway.

[Pahom]

Not a bad LTC 6900 chip, but Sinus is still better. The truth is that for some reason the sine on my generator is not clean, the question is a bit with a failure. How to make it clean without failure. According to pick up 33k, 47k and 330pf? A transistor with the letter B but I think that it is not the point.

[FrancoItaly]

Originally Posted by Pahom

Not a bad LTC 6900 chip, but Sinus is still better. The truth is that for some reason the sine on my generator is not clean, the question is a bit with a failure. How to make it clean without failure. According to pick up 33k, 47k and 330pf? A transistor with the letter B but I think that it is not the point.

Varying C1 changes the amplitude of the oscillator, however the waveform is not very important, an amplitude between 2 and 3 Volts from peak to peak is the optimal value. Too high a value would make calibration difficult. Keep in mind that the oscillator does not intervene directly in the reception of the "phenomenon", it only provides a carrier that will be somehow modulated by the phenomenon.

[totob]

hi i have a question
self oscillation can be exist in display stage or just in sensor stage?

[FrancoItaly]

Originally Posted by totob

hi i have a question
self oscillation can be exist in display stage or just in sensor stage?

Almost certainly in the sensor stage.