Lrl from Italy

[FrancoItaly]

I installed the cd4046 lrl version, but it's not responding to anything; the LED on the antenna only turns off when I bring my hand close. Is this plan incomplete? I think it's not a plan that works like the 8 MHz version. Has anyone managed to get the cd4046 version working?

No, this is the final version but not very sensitive, perhaps the frequency, around 2.8Mz, I think, is too low, but the CD4046 does not work well on higher frequencies.

[gs78]

In version cd4046, the detection disappears when the L1 coil is connected, but it detects perfectly when the L1 coil is not connected. What kind of antenna is needed? I installed a radio antenna, is this correct?

[FrancoItaly]

In version cd4046, the detection disappears when the L1 coil is connected, but it detects perfectly when the L1 coil is not connected. What kind of antenna is needed? I installed a radio antenna, is this correct?

No special antenna, just any 30/40cm long whip. With L1 not connected, do you mean the LRL works outdoors on buried metal?

[gs78]

No, when L1 is absent, it reacts to things like the TV and microwave oven inside the house, but when L1 is present, it doesn't react to anything.

[FrancoItaly]

No, when L1 is absent, it reacts to things like the TV and microwave oven inside the house, but when L1 is present, it doesn't react to anything.

The fact that the LRL reacts in the home is not a sign of good functioning; instead, it is a good sign that it is not reacting to disturbances in the home. The disturbing frequencies in the home are mostly 50Hz.

[walkman]

Hi Franco how are you?

Franco LRL video

My pcb 20mhz crystal and adual antenna amplifier add-on

The value displayed on the measuring instrument is the output voltage from the sensor stage. The voltage can be increased up to 9.5V with the antenna amplifier.

Touching the antenna causes a voltage drop of approximately 250-300mV.

https://youtube.com/shorts/47F7nnxy4lE?feature=share

[FrancoItaly]

Hi Franco how are you?

Franco LRL video

My pcb 20mhz crystal and adual antenna amplifier add-on

The value displayed on the measuring instrument is the output voltage from the sensor stage. The voltage can be increased up to 9.5V with the antenna amplifier.

Touching the antenna causes a voltage drop of approximately 250-300mV.

https://youtube.com/shorts/47F7nnxy4lE?feature=share

It seems like a good solution, but 9.5V is too high and can only be used for calibration. The optimal value is between 4V and 6V

[walkman]

It seems like a good solution, but 9.5V is too high and can only be used for calibration. The optimal value is between 4V and 6V

Thanks for answer Franco.
When using a 7812 12V regulator, what should the output voltages of tr3 and tr4 be in the schematic? For example, Tr3=4V Tr4=5V

[FrancoItaly]

Thanks for answer Franco.
When using a 7812 12V regulator, what should the output voltages of tr3 and tr4 be in the schematic? For example, Tr3=4V Tr4=5V

For TR3 and TR4, values in the 4/6V range are fine. To obtain these voltages, you need to find the right value for R8 and R11 using a trimmer and then connect two resistors in series/parallel instead of the trimmer. For example, R8 = 820K is equivalent to 680K + 150K = 830K, the closest value.

[gs78]

I installed a 12 MHz crystal on the 8 MHz version model without making any changes. Will this cause any problems, or what changes do I need to make?

[FrancoItaly]

I installed a 12 MHz crystal on the 8 MHz version model without making any changes. Will this cause any problems, or what changes do I need to make?

No problem, it works well in the 3Mhz/15Mhz range, but I don't know which is best, and I would also need to change some values.