If you want my opinion, i believe this is not Alonso PD. I have sense about who is designer, but i don't right publish here.
My sense is strong. In this case i am "free" use some parts without license.
But if i am false about my opinion, we have only one "brake" for mass production. This is the long time for calibration. For example i want (PD without discrimination) minimum 10 days for calibration. This long time need for calibration all together and choice between many-many ferrite (same parts-number) the best for use. In this case need small luck for find the best parts for one PD.
Regards

HI
 

Does this product is in the market. And how much the price?

Dear Andrea Thank you for your answer.
some questions
calibration of ferrites do by moving up and down the ferrite
through the screw?
The commuters ferrite front back?
Led1 is the low battery indicator?

If you replace C4 (see #116) with value <10nF, you have more distance detection.
Ofcourse with C4=100pF... 470pF you have best distance detection.
that the tantalum capacitor're replaced c4 10uf
thanks in advance

a question
who knows how to answer me.
The ferrite coil creates oscillation in the passive receiver input?

Now i am interested only in stability and modifications
regards

I think are very clean. The first one i use a copy from original Alonso. Without mods i see the first results. Try with this or... better use opinions from Greek electronic engineers. We have best team our country and forums with realistic opinions
best regards

Hi Andreas,

thanks very much for the effort and great information here. I want to build this Alonso-PD clone and spent many hours in this forum to collect all that spread info. Its really a pity because some information is confusing and messed up and also sometimes contains erros. Therefore many beginners don't know how to build the device and get frustrated. I want to try to fix it but I need a little bit of your help. I want to put the whole project into 1 Zip file for everyone to understand and build the device.

First here is the partlist from both schematics (Mainboard & Transmitter Board):

MAINBOARD (Real Clone Alonso-PD)
http://www.longrangelocators.com/for...ad.php?t=18956

LED
LED1 =
LED2 = high bright yellow
LED3 =

CAPACITORS
C11, C22, C32, = 1n
C23, = 3n3
C24, C27, C29, C30, C38, = 10n
C19, C34, = 22n
C12, C16, = 47n
C15, C20, C31, C33, C35, C36, C37, = 100n
C14, = 220n

C4, = 10mF tantalium. If you don't have connect serial + - - + two electrolytic capacitors 22µF
C3, = 10µF
C6, C7, C9, C22A, = 100µF
C1, C2, C8, = 220µF

Cx = 470pF


RESISTORS
R1, = 47R
R20, R39, = 100R
R16, = 150R
R8, = 220R
R21, R51, = 470R
R30, R33, = 560R

R5, R9, R10, R11, R12, R13, R22, R35, R36, = 1K
R48, = 1K2
R4, = 2K2
R18, R31, = 2K7
R37, R40, R44, = 4K7
R2, R3, R29, R34, R42, = 10K
R14, R17, R19, R47, R53, = 12K
R38, = 18K
R7, R32, = 33K
R15, R28, R45, R49 = 100K
R52, = 220K
R50, R54 = 390K
R6, R6A = 680K (If you don't have 680K you can replace with 1M)
R41, R43, = 1M

MULTITURN POTENTIOMETER
PI, = 47K

INTEGRATED CIRCUITS
U1 = LM7809
U2 = LM555
U3 = 741
U4 = LM78L05

TRANSISTORS
D4, D6, Q3, Q4, Q5, Q9, Q13, Q15, Q17, Q18, Q20, = BC548
Q6, Q11, Q12, Q16, Q19, = BC558

DIODES
D5, = 7V5
D1, D8 = 1N4148
D2, D3, = 1N60 (If you dont have 1N60 you can replace with poor RED LED - no high right - work as diode perfect if frequency is < 3MHZ)


TRANSMITTER BOARD

RESISTORS
R1, = 22R

R6, = 3K9
R7, = 8K2
R5, = 10K
R4, = 18K
R2, = 27K
R3, = 82K

TRANSISTORS
Q1, = BC558
Q2, = BC548

CAPACITORS
C3, C4, = 10n
C2, = 47n
C1, = 100µF

Ok and here I've done an overview of all the components I know for this project. Can you please let me know how everything is connected correctly? Thank you very much.

https://www.dropbox.com/s/ua698j1njj...nnect.jpg?dl=0


https://www.dropbox.com/s/ua698j1njj...nnect.jpg?dl=0

Okay Daniel
Have you built this circuit.
Share photos of your circuit.
Show new and old metal keys are enabled and disabled Sense
2 display wiring circuit, and display and explain their side of the coil.

***************************
Alonso wins the circuit in 7 build
And those were the circuit changes
1 out of every 10 people who make up this circuit concluded
Set the ferrite coil to coil transmitter must be exact
Capacitors are all high quality and resistance should be no tolerance
The volume of high-quality multi-layer used
Otherwise, you may not even feel the metal
Or that feeling of depth below 80 cm

PD
 

hi all
hi andreas thank you for this project
please post picture of coil's
best regard

Yes I've built the circuit and it makes sounds like a geiger counter. It does not react to any metal or magnets. But Im not sure how to connect the coils, main pcb and transmitter pcb correctly. There is no diagramm/schematic with everything connected together therefore Im confused.

Can you please connect the lines in my post 184 with the picture "How to connect everything correctly?".

http://www.longrangelocators.com/for...&postcount=184

Thanks very much

Nice work but you need much times to calibrate and make it work

look here here in this comment

http://www.longrangelocators.com/for...&postcount=116
and

http://www.longrangelocators.com/for...&postcount=120

see pic

Calibration is not the problem. I don't know how to connect the parts correctly. Im also really confused I've found error on Transmitter PCB versus schematic.
Capacitor C4 is placed wrong on PCB and R7 is not existent. We really need a diagramm with all parts connected together to locate any possible errors.

I will try to complete the connections in the picture from post 184 but I need help because Im not sure if thats correct.

Here is the error I found on transmitter board PCB:

The pcb true image


http://cdn.top4top.net/i_a838d1e1c30.png

Okay here I've made a connecting diagram of this project. Its not complete because I don't know how to connect the RX coil and Ferrite (Please help).

Please check for errors and let me know how to connect the missing parts.

Thanks

Thanks brs,

your're right it's much easier that way.

UPDATE UPDATE UPDATE !!!!
Finally I've found out how to connect everything together. I will try to update my post with new diagram or post a new one in 1 hour.

Final wiring diagram
 

After digging through all the posts and threads on this forum I've found the answers.

This is my final wiring diagram Rev. 1.1 2014.
If someone finds any errors please let me know and I will update it.

Daniel

I had good results with alonso 5 pcbs combination with coil heatkit gd 348..estou working on it

I made this lrl last year with the same configuration above but does not give a promising result. True, this lrl is very sensitive to the phenomenon but is not stable, it drifts from time to time. So the operator should re adjust the sensitivity oftentimes.

Regards...

This is the fault where we have so much amplification in DC. As with the metal detectors you need a button for retune or a motion amplifier.

Regards

you have an idea for improving the pd and better performance?

Sorry but I don't know well this lrl.
Best Regards

thanks Franko