Lrl from Italy

[Geo]

Hi Franco.
I will inform if any change will give better results.
""Phainomenon"" is a very strange phainomenon....

I replaced the transistor of mixer with a BF240 and now the xtal version is more sensitive. Now it receives the signal from generatior more far than 3m with a good signal. I also connected a μammeter so to "see" if a change is negative.
Next days will go to field for test
Regards

[FrancoItaly]

Hi Geo,

Good idea, BF240 is a true RF transistor also, I think, with less beta gain, but if DC out is OK then the lrl should work equally.

Regards

[Geo]

Hi Geo,

Good idea, BF240 is a true RF transistor also, I think, with less beta gain, but if DC out is OK then the lrl should work equally.

Regards

Hi Franco.
First.. i tried it at Multisim and gives 2x more signal at output of mixer compared with BC183.
I did not measure the DC out but it seems to work perfect.

Regards

[brs]

hi franco
hi friends
lrl Must be Work near Radio stations
Stay away if Broken sense to be a transmitter
I want to transmitter pcb or Electronic circuit
and how much the transmitter frequency.To penetrate the ground ,mhz , khz or hz ??

[FrancoItaly]

This thread is not for this, physics of metal detectors is not the same of the lrls.

Regards

[fmnotes]

Hi Geo,

Good idea, BF240 is a true RF transistor also, I think, with less beta gain, but if DC out is OK then the lrl should work equally.

Regards

What exactly transistors can be replaced with BF240????
1 , 2 , 3 or 4 transistors.
You can be noted in the schematic???
thank's

[FrancoItaly]

TR1 with quartz version and TR2 with CD4046 version.

[Arionas]

TR1 with quartz version and TR2 with CD4046 version.

http://postimg.org/image/gjj2jx2zv/

http://postimg.org/image/v47ww6g99/

[FrancoItaly]

I post the two versions again.

[FrancoItaly]

Here the rest of the LRL, the power is supplied from two 9V batteries connected in series for a total of 18V. In the version with 3 LEDs it is not represented but the power supply stage is the same as the version with 1 LED.

[fmnotes]

Thank's Franco

[Mohlrl]

Hello Mr. Franco. Thank you for your efforts and providing device. I built 8mhz quartz version with bc237b transistor (I had access only to this transistor). The output voltage of device is 4.3 volts. When I'm close to the antenna my hand,one light led went off. But device don’t react to mobile. Device performance is good? Thanks for expressing your opinions. One movie is attached.

http://www.uploadmb.com/dw.php?id=1460808977

[FrancoItaly]

Hi Mohlrl,

the behavior is ok, you only need a test on the field with a long buried target.

regards

[Mohlrl]

Thanks very much for Help Mr Franco

[RIMES]

Hi Mr Franco;
Mr Franco thank you, I have made your device with 8 MHz, but the antenna I used the model shown in the picture attached (a single round of 8 centimeter diameter) and when I touch with my hand the LED lights, is it good?

http://www.longrangelocators.com/forums/showpost.php?p=139152&postcount=600