My TOTeM project

[Goldmaxx]

Hi to all,

I currently have some time, I will here show the construction of my TOTeM project.
Since I am not a electronics expert and I hope that I maybe get some help here.
The theme PD has always fascinated me and I very much fun to construct.
It will be my first PD project and am very excited.

At this point, I would like once more to thank so much Qiaozhi and Carl for the wonderful book Inside the METAL DETECTOR, which made me very thrilled.

So the PCB I have almost finished, there only missing the transistors.

And here was already my first question to Qiaozhi:

There are three different versions of the BC108 transistors A, B or C.
Which type do I need, or are they all the same?

Thank you very much

best regards

Here are picture of my PCB

[Qiaozhi]

And here was already my first question to Qiaozhi:

There are three different versions of the BC108 transistors A, B or C.
Which type do I need, or are they all the same?

You can use either type in this application. In fact, any general purpose NPN transistor will be ok, as these are only being used in the audio stage.

[nelson]

Hi Goldmaxx

I congratulate your work and this will be my next proyect too after my vacations, so i will be following your post.

About transistors has Qiaozhi is pinting out, you can use almost any substitute.

Good luck in your new project and have a happy new year.

Regards

Nelson

Hi to all,

I currently have some time, I will here show the construction of my TOTeM project.
Since I am not a electronics expert and I hope that I maybe get some help here.
The theme PD has always fascinated me and I very much fun to construct.
It will be my first PD project and am very excited.

At this point, I would like once more to thank so much Qiaozhi and Carl for the wonderful book Inside the METAL DETECTOR, which made me very thrilled.

So the PCB I have almost finished, there only missing the transistors.

And here was already my first question to Qiaozhi:

There are three different versions of the BC108 transistors A, B or C.
Which type do I need, or are they all the same?

Thank you very much

best regards

Here are picture of my PCB

[Goldmaxx]

You can use either type in this application. In fact, any general purpose NPN transistor will be ok, as these are only being used in the audio stage.

Hi Qiaozhi,

many thanks for the information, now I can finally make the completed PCB
and continue with the case.

Regards

Goldmaxx

[Goldmaxx]

Hi Goldmaxx

I congratulate your work and this will be my next proyect too after my vacations, so i will be following your post.

About transistors has Qiaozhi is pinting out, you can use almost any substitute.

Good luck in your new project and have a happy new year.

Regards

Nelson

Hi nelson,

thank you very much and also for the tip. I will try to gradually my complete setup of Totem documented and am happy for all the help I can get.
However, it should not only be a help for me, but also for all others who want to build this project.
Of course, just as much as it Qiaozhi and Carl permit, because it's their idea and from your book.

Nelson, I am pleased that you want to build a totem too, and of course everybody else.
I hope that together we can make a good Thread with lots of information put up and at the end an interesting project and perhaps even an working PD build.

I wish you a great vacations and a happy new year, well as all other of course too.

regards

Goldmaxx

[nelson]

I know you will get success with TOTem
To be honest i just think all this kind of devices really works and if some of them not work has expected, is because is bad tuned. To me the clue is to get TOTem well tuned and this is the hard part that must be worked together with members.

Thaks for your wishes and let me said to you and your family and members the best wiches for the new year 2013.

Best regards

Nelson

Hi nelson,

thank you very much and also for the tip. I will try to gradually my complete setup of Totem documented and am happy for all the help I can get.
However, it should not only be a help for me, but also for all others who want to build this project.
Of course, just as much as it Qiaozhi and Carl permit, because it's their idea and from your book.

Nelson, I am pleased that you want to build a totem too, and of course everybody else.
I hope that together we can make a good Thread with lots of information put up and at the end an interesting project and perhaps even an working PD build.

I wish you a great vacations and a happy new year, well as all other of course too.

regards

Goldmaxx

[Goldmaxx]

I know you will get success with TOTem
To be honest i just think all this kind of devices really works and if some of them not work has expected, is because is bad tuned. To me the clue is to get TOTem well tuned and this is the hard part that must be worked together with members.

Thaks for your wishes and let me said to you and your family and members the best wiches for the new year 2013.

Best regards

Nelson

Hi nelson,

that is true what you say, the most difficult will be the calibration of the unit.
This is my first PD I'm building, because it is well documented in the book and I'm sure that you really do with the TOTeM as the first project,
can be learned a lot about the function of such devices.
For me it is very exciting and I'm very curious if it works.

But I am sure that together we will create a good calibration.

Thank you for your wish, I wish you and your family back.

best regards

[Goldmaxx]

Hi to all

I hope that you all came well in the new year and above all that the new year will be better than the old.

I had some time and the days have continued to make at my TOTeM project.

First, I have completed the PCB. I soldered the missing transistors and the connecting cables. It looks quite good, I just hope that it works.

Here pictures of it

[Geo]

I wait for results!!!

[Goldmaxx]

I wait for results!!!

Hi Geo,

I'm myself very curious about the results

I will report it to you any case

[Goldmaxx]

Next, I will build the casing, so that I can connect the Switches, Beeper, Potis und the 250 uA Meter on the PCB.

With a CAD program I have constructed a 3D model of the body, so I can make patterns for the cutouts and drill holes.
The casing itself is constructed as described in the book, only the handle I have been slightly modified.
I have from the 3D model made a 3D pdf. You can it download below.
You can open it with the normal Acrobat reader and it with the left mouse button rotate in all directions and turn as you like.
You can also hide and show parts, and zoom the model in and out.

Here are some pictures

[Goldmaxx]

and here the 3D pdf
have fun

[Qiaozhi]

and here the 3D pdf
have fun

Good work!

I really like the 3D PDF file. It looks and feels like a Sketchup model, but (as far as I'm aware) Sketchup cannot export a PDF file like that. Maybe you're using the Pro version ... or is it something else?

[Goldmaxx]

Good work!

I really like the 3D PDF file. It looks and feels like a Sketchup model, but (as far as I'm aware) Sketchup cannot export a PDF file like that. Maybe you're using the Pro version ... or is it something else?

Hi Qiaozhi

Thank you!
It's nice that you like it.

I work with Catia V5, so I create the 3D models and save it as stp file.
This format is required in order to generate a 3D PDF.
To create the 3D pdf file you need Adobe Acrobat 9 Pro Extended.
So you can read in the stp file and save as 3D pdf.
And ready is the 3D pdf file.

[Goldmaxx]

Hi to all,

I had the day some time to continue my totem project. The case is now finished and will paint it black.
When the paint is dry, I will install the PCB, switches, potentiometers, and the instrument.

Here are some pictures