help me - help me

[Fred]

Fred, probably you do not understand good LRL design rules. You need to take some design courses at dr. Hung.

Thank you WM6, you are right, i should send him a pm .

Wm6 is designed very well, fred.Designed with scientific principles.To avoid disturbance frequency should be a plan that is different from other circuits with metal detector.
This time I plan to pcb1:

Maybe we have different conception of what is a scientific principle, but i found this design terrible. I usually don´t criticize other´s work, but i was sure WM6 was smart enough to understand that it was not a negative critic, and his answer confirmed it .

Very well ma330, right thing. Congratulations.

Please post PCB in Black/White .JPG format (or .gif or other pic format) too, cause some of us have trouble with .lay format viewer.

I think that you know it but for windows there is a free editor to download on the sprint layout homepage.

[WM6]

I think that you know it but for windows there is a free editor to download on the sprint layout homepage.

Thanks Fred. I know, but I am under Linux for a while and a bit lazy.



@ma330: Thanks for your kindness.

[mehdi]

for wm6
The size pcb is 140 * 45mm
Put in the files of high quality and reliable printing for you
enjoy
good luck

good job my friend, excellent

[mehdi]

i checked it and i can say it has not any problem.

[aft_72005]

Hi aft_72005,
Yes, I know that Iran has a long and rich history.
This was the ancient Persia which was much larger than Iran today.
For mest64, I agree with you.
There is no reason why anyone should use fake names unless they have some secret mission.
For me, I want no part of any of the mesy64 or other fake names from mesyana.
I think it is good to ignore all attempts from mesy64 to beg for circuits.
This forum is for people who want to experiment with LRL principles, not for fake names to come and continue to ask for more circuits.

Thank you for your help with some good engineering in other threads.

Best wishes,
J_P

Hi J_Player
Also I am thank you, you are smart engineer, I reading all your messages in forum .
You having strong theory.
Best regards.

[Fred]

At this speed of progress in a few days we will have pictures of treasures everywhere.
And JP will be a worldwide known Prophet/God/ saint/guru (your choice)

[ma330]

Your believe.What is the power of detection in this pd?

[ma330]

my pcb is Ready

[Fred]

my pcb is Ready

I may be wrong but it seems you have reversed it.For your luck there are no IC´s, but you will need to rotate all the transistors 180º.

[ma330]

I may be wrong but it seems you have reversed it.For your luck there are no IC´s, but you will need to rotate all the transistors 180º.

no dear fred
Everything is correct.No need to rotate any part. When comes back everything will be in place.I've developed a very PCb with this software.All of them are working.
good luck

[Fred]

Rotate or not rotate, that is the question.
Good luck to you too !

[ma330]

Rotate or not rotate, that is the question.
Good luck to you too !

dear fred
I had seen none of the transistors.I just put them in the replica in pcb.And did not specify the base and collector base and emitter of the transistor Because users are free to place transistors.
good luck

[WM6]

my pcb is Ready

Hi ma330, please, left some gold to me too!

[J_Player]

Hi ma330, please, left some gold to me too!

Hi WM6,
You can gold-plate the board, then you will have a built-in sample with many ground currents flowing through it.


Best wishes,
J_P

[J_Player]

More information for the metal locating PD:

I checked an old computer hard drive and found more notes I made from the old forum posts describing this PD adaptation of the original factory locator.
You can see there are some corrections I found.
You can use some of these infos to check if your version is working the same as the original factory version.

1. The 50K sensitivity pot is multi-turn. This will give better control for making fine adjustments to the sensitivity.

2. If you measure the voltage across the ends of the TX coil (same as across the 3.3nF mica capacitor), you will find a maximum peak voltage of 180v. This means you want to use a real mica capacitor that will not have a problem with 180v. This coil measured at 759uH, about 4 ohms. The TX wire size had the appearance of being 0.45mm diameter (AWG 25).

3. The TX coil oscillator has a pulsed frequency that repeats 333 pulses per second. Each of these pulses sends a burst of VLF frequency which decays logarithmically to nothing within 0.6 ms (this is about 1/5 of the time between pulses). This series of pulses is generated at the first transistors which form a relaxation oscillator connected to the TX coil at the tap between the 12T and 3T windings. Your version pistol locator vary a little depending on the exact values and tolerances of the coil and capacitor that you use for the TX, and the pulse rate could vary depending on the tolerances of the components around the first two transistors. [Note: I suspect there may be an error reading the pulses per second. It may be 667 pulses per second if I did not read my notes correctly.]

4. The RX coil voltage measured across the ends (same as measure across 1.8nF capacitor) is 400 mv from peak to peak. This coil measured 4.166mH at 21.2 ohms.
The RX wire size had the appearance of being 0.25mm diameter (AWG 30).

5. Initial pinpointing distance tests in air:
45 cm = coke can
14 cm = aluminium sheet 14cm x 9cm
1.2 m = other large metal objects

No problem pinpointing to find the correct place to dig a hole
Discriminates from ferrous to non-ferrous
Detected the engineer's hand when he moved it close to the coil.

I assume the discrimination accomplished by the tone that is heard on the speaker.
This would mean there is a difference in phase angle of the received signal depending on whether we are detecting a ferrous or non-ferrous metal anomaly, and this phase angle variation is preserved so it can be heard through the audio amplifier.

The corrections I show above will be included in the final compilation for this project.
Remember to make changes to for building from previous posts above.


Best wishes,
J_P