Moby

Bv8,12,11 replica - Support Thread
« on: December 14, 2017, 10:31:43 AM »
Hey guys, I started this thread to keep you informed about the progress and later for support in assembling, experimenting, etc.
As you probably know, the most challenging part of this project is design of the bobbin tool and it took me most of the time to make it perfect. Actually, I used the local tool maker shop service and they are still fighting with some minor issues. 
Alternative option was 3D printing, but I was not so happy with that option because it doesn't look as the original and the material can't be the same.
So, here are some pictures of the tool. Wish me luck, I expect some good news today because they do corrections in  the design and I expect after 2 months of waiting to be as done.





EDIT: Added drawing with dimensions and electrical connection/color code



« Last Edit: April 05, 2018, 06:26:47 AM by Moby »
For microphone transformers,  BV.8,  Bv.11,  Bv.12, etc.. contact me at mobyelectronics at gmail dot com


Moby

Re: Bv8,12,11 replica - Support Thread
« Reply #1 on: December 14, 2017, 10:57:32 AM »
Also, the laminations are ready.
Ni 78

Ni49
For microphone transformers,  BV.8,  Bv.11,  Bv.12, etc.. contact me at mobyelectronics at gmail dot com

Murdock

Re: Bv8,12,11 replica - Support Thread
« Reply #2 on: December 25, 2017, 07:29:39 PM »
Looking great!!
Is the bobbin tool finished now?

Moby

Re: Bv8,12,11 replica - Support Thread
« Reply #3 on: December 25, 2017, 08:45:09 PM »
Looking great!!
Is the bobbin tool finished now?
Yes, but it still has some issues. Fine tuning is  in progess . I hope to see the bobbins soon :)
For microphone transformers,  BV.8,  Bv.11,  Bv.12, etc.. contact me at mobyelectronics at gmail dot com

Khron

Re: Bv8,12,11 replica - Support Thread
« Reply #4 on: December 26, 2017, 07:07:07 AM »
So what exactly is this "bobbin tool" for? Making the bobbins themselves, or winding them, or..?
Khron's Cave - Electronics - Audio - Teardowns - Mods - Repairs - Projects - Music - Rants - Shenanigans

Moby

Re: Bv8,12,11 replica - Support Thread
« Reply #5 on: December 26, 2017, 07:31:41 AM »
So what exactly is this "bobbin tool" for? Making the bobbins themselves, or winding them, or..?
Making the bobbins.
Edit:  Neumann used custom shaped, non standard bobbins in their UI30/25 transformers range. All todays recreations use modified or similar shaped bobbins (withouth 4 chambers or with inserts). This series will use original shaped and more important original material bobbins. But it has a price. Custom plastics injection tool.... ;)
« Last Edit: December 26, 2017, 07:45:59 AM by Moby »
For microphone transformers,  BV.8,  Bv.11,  Bv.12, etc.. contact me at mobyelectronics at gmail dot com

Khron

Re: Bv8,12,11 replica - Support Thread
« Reply #6 on: December 26, 2017, 08:00:44 AM »
"And more important original material"? Because it affects the sound, or..?
Khron's Cave - Electronics - Audio - Teardowns - Mods - Repairs - Projects - Music - Rants - Shenanigans

Moby

Re: Bv8,12,11 replica - Support Thread
« Reply #7 on: December 26, 2017, 08:53:48 AM »
"And more important original material"? Because it affects the sound, or..?
I.never tried to measure diference between bobbin materials but besides its coil body it serves as the isolator between sections (bv.08, bv.11). So, its possible to have some influence to the sound. I dont think its so important, but why not go bit deeper with the project  if its possible?
For microphone transformers,  BV.8,  Bv.11,  Bv.12, etc.. contact me at mobyelectronics at gmail dot com

Murdock

Re: Bv8,12,11 replica - Support Thread
« Reply #8 on: January 03, 2018, 04:42:22 PM »
Don't want to sound impatient, but is everything going well?  ::)

Moby

Re: Bv8,12,11 replica - Support Thread
« Reply #9 on: January 03, 2018, 04:47:33 PM »
Don't want to sound impatient, but is everything going well?  ::)
Hey, thanks for asking, happy new year. Its moving slowly. Finally toolmaker sucseed with bobbins. I wait for the right material version (it has to be transparent) and winding will start.
For microphone transformers,  BV.8,  Bv.11,  Bv.12, etc.. contact me at mobyelectronics at gmail dot com


Moby

Re: Bv8,12,11 replica - Support Thread
« Reply #10 on: January 03, 2018, 06:57:47 PM »
If you want to see some more progress photos, please check here.
https://photos.app.goo.gl/YeFuQGEWlrvVNo6O2
Mostly failures,, but thats usuall with plastic molding tools.
For microphone transformers,  BV.8,  Bv.11,  Bv.12, etc.. contact me at mobyelectronics at gmail dot com

Delta Sigma

Re: Bv8,12,11 replica - Support Thread
« Reply #11 on: January 03, 2018, 08:29:04 PM »
Checked out the Google drive photos and this is amazing!

I know nothing about plastics so I Googled it to get an idea. Plastic pellets into your injection tool that heats and injects the molten plastic into your bobbin tool?

Does your tool do two pieces at a time? How long does it take to cool before you can repeat the process? I'm super impressed.

Moby

Re: Bv8,12,11 replica - Support Thread
« Reply #12 on: January 03, 2018, 08:32:50 PM »
Checked out the Google drive photos and this is amazing!

I know nothing about plastics so I Googled it to get an idea. Plastic pellets into your injection tool that heats and injects the molten plastic into your bobbin tool?

Does your tool do two pieces at a time? How long does it take to cool before you can repeat the process? I'm super impressed.
thanks. 4 pieces at once. It goes very fast :) just a  few sec to cool down.
For microphone transformers,  BV.8,  Bv.11,  Bv.12, etc.. contact me at mobyelectronics at gmail dot com

shot

Re: Bv8,12,11 replica - Support Thread
« Reply #13 on: January 03, 2018, 09:04:43 PM »
Wow! This is amazing!
Svaka čast!

:)

Luka

Moby

Re: Bv8,12,11 replica - Support Thread
« Reply #14 on: January 04, 2018, 02:44:12 AM »
Wow! This is amazing!
Svaka čast!

:)

Luka
Hvala.:)
For microphone transformers,  BV.8,  Bv.11,  Bv.12, etc.. contact me at mobyelectronics at gmail dot com

Re: Bv8,12,11 replica - Support Thread
« Reply #15 on: January 05, 2018, 06:46:03 PM »
Man , this is simply fascinating.
Custom tooling for bobbin , and just look at those "rasty" lams.You nailed it.

Moby

Re: Bv8,12,11 replica - Support Thread
« Reply #16 on: January 05, 2018, 06:51:03 PM »
Man , this is simply fascinating.
Custom tooling for bobbin , and just look at those "rasty" lams.You nailed it.
thanks for support. My goal was to make it best possible. It takes time and energy but there is no other way to make it  right.
For microphone transformers,  BV.8,  Bv.11,  Bv.12, etc.. contact me at mobyelectronics at gmail dot com

MagnetoSound

Re: Bv8,12,11 replica - Support Thread
« Reply #17 on: January 06, 2018, 02:52:51 AM »
Following with interest. Nice to see such attention to detail - and in EU territory! 😁
Dan

I don't think people realize what an embarrassment of riches this place is   -  Paul Gold

tony hunt

Re: Bv8,12,11 replica - Support Thread
« Reply #18 on: January 06, 2018, 03:34:34 AM »
Moby,

it is really great to see the process development in the photos.
It gives an insight and already provides a feeling connection to the product.

It is a long time since I had any such tooling made up. I can see the hard work here.
Really impressive, thank you.

tony

Moby

Re: Bv8,12,11 replica - Support Thread
« Reply #19 on: January 06, 2018, 05:34:58 PM »
Moby,

it is really great to see the process development in the photos.
It gives an insight and already provides a feeling connection to the product.

It is a long time since I had any such tooling made up. I can see the hard work here.
Really impressive, thank you.

tony
Thanks :)
For microphone transformers,  BV.8,  Bv.11,  Bv.12, etc.. contact me at mobyelectronics at gmail dot com


 

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