Can pinpointer detecting thin chain?

[Qiaozhi]

For stripboard layouts I use DIYLC -> http://code.google.com/p/diy-layout-creator/
This software is platform independent, which means I can run it under Linux in native mode.
Highly recommended.

[Nupi]

For stripboard layouts I use DIYLC -> http://code.google.com/p/diy-layout-creator/
This software is platform independent, which means I can run it under Linux in native mode.
Highly recommended.

It looks nice.
I go first practice a time with it. Thanks.

[bernte_one]

ok here is what i have done last 2 hours
plan was to make single sided board
th components could be soldered on top, or on bottom by changing orientation (trimmers, trasistors ...)
layout is made with top and bottom tracks
sorry i am noob

[Nupi]

ok here is what i have done last 2 hours
plan was to make single sided board
th components could be soldered on top, or on bottom by changing orientation (trimmers, trasistors ...)
layout is made with top and bottom tracks
sorry i am noob
[ATTACH]28996[/ATTACH]
[ATTACH]28997[/ATTACH]
[ATTACH]28998[/ATTACH]

Great Bente,
I see two small mistakes.
I think you need BD139 and D1 turn 180 degrees.

Is it possible that you make one with a normal components, no smd?


For clarity, I have not made with SMD.
So, I do not know how the circuit will do with SMD components.

[Waikiki_Sweep]

The new Schematic[ATTACH]28952[/ATTACH]

L1 = 330uH L2=1.6mH

Inductance values are very close to TX and RX of some VLF coils.

Can somebody to connect VLF coil to this schematic?

It may show some interesting results!

[Nupi]

Important - Important

I made two mistakes in the schematics.

One in the schematic (schematic NUPI 3) misses D2
In this schematic is restored.

In schematic (pinpointer NUPI 2014.jpg) I made a major mistake. There, the wires 1 and 2a
on the coil is swapped.

In the schematic pinpointer NUPI 2014 (2) is restored.

Sory for the caused inconvenience .

[Harp]

NUPI thank you, excellent documented!

I drew the PCB of the pinpointer compact design with non-SMD parts.
Plate size is 40x40mm. If you like the design you can use it in your kit for sale.
The upper 3 pads is for coil, middle 2 pads is for supply, lower 2 pads is for motor.

I wonder if you could do some testing with the usual materials, to compare data:
Aluminum foil of chocolate: 3x3mm, 2x2mm and 1x1mm
Copper wire 0.4mm diameter: 3mm, 2mm and 1mm
I do not have a gold chain ...

[Waikiki_Sweep]

Nice schematic. I think power consumption is less than 100 mA so you can use smaller size (transistor looking) voltage regulator like 78L05.

Also CD4024 can drive some low load itself so you can use small buzzer with capacitor or LED with resistor to make cheaper simpler version of that pinpointer without second transistor.

[Thomas]

I made a few changes SMD with some trough hole. any mistakes?

[Thomas]

Forgot a black and white and some silk screen mistakes.
and TR2 is a 2n5551

[Nupi]

NUPI thank you, excellent documented!

I drew the PCB of the pinpointer compact design with non-SMD parts.
Plate size is 40x40mm. If you like the design you can use it in your kit for sale.
The upper 3 pads is for coil, middle 2 pads is for supply, lower 2 pads is for motor.

I wonder if you could do some testing with the usual materials, to compare data:
Aluminum foil of chocolate: 3x3mm, 2x2mm and 1x1mm
Copper wire 0.4mm diameter: 3mm, 2mm and 1mm
I do not have a gold chain ...

Nice job Harp.

Thank you but I'm not go make a kit.

I have not yet looked good but Its looks that the transistor BD139 is not good.
See the picture.

It is important that R1 NOT placed on the PCB
With R1 you adjust the sensitivity and the "ground balance".

I have do for you some testing with the Aluminum foil of chocolate: 3x3mm, 2x2mm and 1x1mm
Copper wire 0.4mm diameter: 3mm, 2mm and 1mm

This is the result:
3mm aluminium = 7mm
2mm aluminium = 3mm
1mm aluminium = 0mm

3mm copper wire o,4mm = 2mm
2mm copper wire o,4mm = 1mm
1mm copper wire o,4mm = 0mm

regards

[Nupi]

Nice schematic. I think power consumption is less than 100 mA so you can use smaller size (transistor looking) voltage regulator like 78L05.

Also CD4024 can drive some low load itself so you can use small buzzer with capacitor or LED with resistor to make cheaper simpler version of that pinpointer without second transistor.

You're right. You can use smaller size (transistor looking) voltage regulator like 78L05.


I often use the LP2950 regulation ic with an low input-to-output voltage differential
Low Input-to-Output. Voltage Differential of 50 mV at 100 A and
380 mV at 100 mA. so you can use the 9V battery longer.

Thanks Waikiki_Sweep you're right again, CD4024 can drive some low
load itself so you can use a buzzer. I have experimented with, a time ago,
but only with a LED I had no success.
With only a buzzer worked fine. I do not remember what voltage used for the buzzer.
The sensitivity is less than the "Big one"
But you can try.


I will soon post the schematics of the smaller variant pinpointer. (the mini)

[Nupi]

MINI

Schematics from the mini-pinpointer nupi.

Who wants to build the pinpointer smaller you can build the mini - pinpointer nupi.
The sensitivity is less than the "Big one" but it is worth to try it yourself.

I have the schematics adapted and given him the name mini - pinpointer nupi

[Thomas]

I took a few things off board, for a small board, I do everything I can SMD.

[Waikiki_Sweep]

I took a few things off board, for a small board, I do everything I can SMD.
[ATTACH]29029[/ATTACH]

Great job!
It will fit 20mm plastic pipe. So you can put a coil with ferrite core in the same pipe.
May be it is possible to add some voltage converter IC to power schematic from one or two AA batteries to let everything to fits that 20mm pipe.
Or may be it will work from 3V at all.

Or you can use small 12v batteries for photo cameras:
Ultra 12 V Type G23A is know as 23A, 23GA, A23, E23A, GP-23A, GP23A, K23A, L1028, LR23A, LRV08, LRVO8, MN21, MS21, V23, V23GA, VR22
http://www.ebay.com/itm//281155577756
It is smaller pinpoiinter ever build.