Bartolini NTMB reverse engineered (schematics inside)

[Bernardduur]

He Kriwil, just to answer your PM;

I also had no issues with any treble loss. I really liked the circuit and used it a lot back in the days I still had it........

[markusw]

acctually, i'm not to sure for the treble loss... Is this the way it does or not... I've tried do the simulation using LTSpice freeware, somehow, there is no pot available in the library... I cannot do the simulation...

Could u sent me the file for LTSpice to do the simulation?? or, may be you can post the result graph for simulation with original schematic.

I'm in a bit of a hurry right now, but you can download pot model files and a lot of other useful stuff (e.g. a Vactrol model) at the LTSPice yahoo news group. You can find it easily with googling. There is also an explantion on how to use these pot models.

If you can't find it I will send you the LTSpice file later, but I can assure you the EQ response is flat (smaller than 1dB) from 20Hz to 10kHz.

Regards,

Markus

[kriwil]

He Kriwil, just to answer your PM;

I also had no issues with any treble loss. I really liked the circuit and used it a lot back in the days I still had it........

I believe you are using the original schematic as well. Then something wrong with my clone... I need to check again.
something wrong with the treble section.

[kriwil]

I have check my clone, i tried to bypass the eq section. I connect directly from first op amp output (C15). The sound somehow different with the original sound (passive mode).

Will trace the pcb route again... may be something is not routed properly.

[kriwil]

I just found that i put the wrong value of  68p cap. Now, the clone works perfectly. The sound is awesome......
Thanks markus and bernardur....

[markusw]

I just found that i put the wrong value of 68p cap. Now, the clone works perfectly. The sound is awesome......
Thanks markus and bernardur....

Cool 

Markus

[Bernardduur]

Nice!

[xaxxop]

wow thank you guys! 

Where can I buy the inductors?

smallbear only 1h, 220mh and 470mh

have a nice day!

[xaxxop]

please someone can help me 

[Jarno]

RS Components? Mouser? eBay?
At Conrad Electronics they have a diy inductor kit (core and winding wire) maybe that's an option. You need 3x100mH right? If you wind yourself you can make it a tapped inductor. I do wonder about the physical size of the core being offered at Conrad, maybe it's too large to fit in an instrument.

[xaxxop]

thanks 

hhttp://ar.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=1911226

Is this inductor for NTMB?


leandro.

[Jarno]

Your link doesn't work, so there is no way to tell 

[Bore-inger]

µicro not milly  : µicro:small/milly:big!

[rectifier03]

Hello everyone.
I was wondering if I could use 3X fastron inductors with 100 mh ?
here's the data sheet:

[iggipopovski]

150 micro H, or 150 mili H?...
I have found 150 micro, but in the electronics shops here nothing more than 2,7 milli H

[samuelluthier]

Hi, Does anyone have the layout of this project Bartolini NTMB?
thankyou.