Lrl from Italy

[FrancoItaly]

Unfortunately, it's been several years since I did research and tests with my lrl and I don't remember all the details that are asked of me, very important is the voltage of the lrl power supply, the 7812 requires at least 15V to work correctly, I recommend 18V power supply and calibrate the control led to light up with 15.5V. Regarding the sky effect and the compass effect they are due to excessive amplification so the only remedy is to lower it. In my country, I can not vouch for the others, the greatest sensitivity is proceeding from north to south, the minimum from south to north and an intermediate value east/west and west/east. Regarding the stability of the sensor stage output I have never had problems. I invite other members who have built my lrl to express their opinion.

[okantex]

İ do agree with working conditions if 7812.
With acid battery ..it gives 10.5v
But even with 18v supply...will give 12v
How to calibrate LED with 15.5V?
Circuit will be working with 12v

Outside..at field..i can not see sky effect.
And at the pointer Target..even getting singal 15m north..6m south...i can not get Signal from West or east even over the Target.
Any comments

[FrancoItaly]

R1 in the power/display (1 led) stage is connected to +18V and together with R2 forms a voltage divider that halves the voltage of 18V.