Lrl from Italy

[FrancoItaly]

I do not understand what you mean to do, the 470k / 22k ratio establishes the operational gain, what is the switch for?

[kaligula]

Originally Posted by FrancoItaly

I do not understand what you mean to do, the 470k / 22k ratio establishes the operational gain, what is the switch for?

For turning on the device

[FrancoItaly]

Originally Posted by kaligula

For turning on the device

I do not see any picture.

[kaligula]

Originally Posted by FrancoItaly

I do not see any picture.

I can't upload pictures, I don't know why. So my question is to put switch for turning on and off the all unit. Its better for me to not put additional switch, I want one of the potentiometers to be with switch. Which one is better to be with switch?

[ford]

Originally Posted by FrancoItaly

Hi ford,

Lrls can reveal gold, silver, copper and their alloys as long as they have been buried for some time and are insensitive to iron and steel. You have to have a test field where you have to bury some objects like silverware or coins at a depth of about 20 cm and wait 3/4 weeks (or more depending on the type of terrain).


Best Regards

Thank you France
I will do it.
Best regards

[FrancoItaly]

Originally Posted by kaligula

I can't upload pictures, I don't know why. So my question is to put switch for turning on and off the all unit. Its better for me to not put additional switch, I want one of the potentiometers to be with switch. Which one is better to be with switch?

Hi Kaligula,

It's not a good idea, every time you turn it on, you have to find the right setting. It is better to have a separate switch. Anyway 470K or 22K is the same thing.

Best Regards

[kaligula]

Ok, thanks for answer. I purchased this pcb from this document. Does someone has made this device with this pcb?

[ford]

I think Franco pcb is better.

[Napsterce]

Franco has explained that his pcb has it's own capacivity which plays role in the whole circuit...

[kaligula]

To use Franco pcb is best way with minimum risk, but nowhere here I couldn't find display stage pcb with 3 led. Because that l purchase this pcb, so we'll see the results. By the way I want to ask administrators why I can't upload.pictures.

[Napsterce]

Kaligula i have sent you private message.

[kaligula]

Originally Posted by Napsterce

Kaligula i have sent you private message.

I can't find it. Send it to my email or write here

[kaligula]

We are starting. I'll gonna make it with transistors BC183L, I
couldn't find BC183C, is it some problem?

[FrancoItaly]

Originally Posted by kaligula

We are starting. I'll gonna make it with transistors BC183L, I
couldn't find BC183C, is it some problem?

All transistors as BC...C, work, "C" is for very high beta (gain). Probably BC ... B types also work. You can measure the transistor beta with the tester, values over 500 are fine.

[kaligula]

Originally Posted by FrancoItaly

All transistors as BC...C, work, "C" is for very high beta (gain). Probably BC ... B types also work. You can measure the transistor beta with the tester, values over 500 are fine.

It supposed to be OK, it is declared as 900

[FrancoItaly]

Originally Posted by kaligula

It supposed to be OK, it is declared as 900

BC183LC is in the range 450 - 900

BC183LB is in the range 240 - 500

BC183L doesn't exist, it must be LA or LB or LC

[kaligula]

Originally Posted by FrancoItaly

BC183LC is in the range 450 - 900

BC183LB is in the range 240 - 500

BC183L doesn't exist, it must be LA or LB or LC

No, it's L, I can't upload pictures. In datasheet which I upload there are L, LA, LB, LC. All of them have same pin configuration. It have bigger range 125-900

[FrancoItaly]

Originally Posted by kaligula

No, it's L, I can't upload pictures. In datasheet which I upload there are L, LA, LB, LC. All of them have same pin configuration. It have bigger range 125-900

Anyway the beta must be more than 500.

[kaligula]

I have other question. Is it big consumer of elecric power? I plan to use 4 batteries from cell phones with capacity from 1000 to 2000 mAh

[kaligula]

I put two variable capacitors from 5p parallel with 15pf, so we'll see the results

[ford]

Hi all
I used BC549B and my Lrl work fine.

Best Regards

[ford]

Originally Posted by ford

Hi all
I used BC549B and my Lrl work fine.

Best Regards

BC549B is low noise transistor via 200 ~ 450 hfe.

[FrancoItaly]

The absorption is very small, 20 - 40mA, depends on how many leds are used. I recommend two 9V batteries connected in series.

[kaligula]

Originally Posted by FrancoItaly

The absorption is very small, 20 - 40mA, depends on how many leds are used. I recommend two 9V batteries connected in series.

Great, ill use 4 mobile phone batteries from 3.7v and I'll conect them with 4s electronic board for lithium batteries. I'll have around 15v. I finish soldering today, but I'll try tomorrow or some other day. Thanks Franco for your cooperation. To bed is that I can't upload pictures. Is it there some other way?

https://image.ibb.co/ewNxMa/IMG_20170816_101751.jpg

https://image.ibb.co/ftBoBa/IMG_20170817_153400.jpg

https://image.ibb.co/ep5yBa/IMG_20170817_153418.jpg

https://image.ibb.co/m57TBa/IMG_20170817_153741.jpg

[FrancoItaly]

Originally Posted by kaligula

Great, ill use 4 mobile phone batteries from 3.7v and I'll conect them with 4s electronic board for lithium batteries. I'll have around 15v. I finish soldering today, but I'll try tomorrow or some other day. Thanks Franco for your cooperation. To bed is that I can't upload pictures. Is it there some other way?

https://image.ibb.co/ewNxMa/IMG_20170816_101751.jpg

https://image.ibb.co/ftBoBa/IMG_20170817_153400.jpg

https://image.ibb.co/ep5yBa/IMG_20170817_153418.jpg

https://image.ibb.co/m57TBa/IMG_20170817_153741.jpg

Good work, as regard to upload pictures, you must read forum rules, for example jpg no more than 1M.