So it was you, who snagged it. Eh, I was not quick enough to bid more
![Scared :scared:](https://www.eevblog.com/forum/Smileys/default/scared.gif)
Please, please, do post inner photo and better external photos of preamp. Few voltnut's here already commited to making DIY preamp board for K2001/2002's we have here.
/!\ Do not remove short from preamp input terminals to avoid ESD damage!
To get it all working, you need:
* Make own preamp supply board (which goes into option slot in DMM) with very quiet isolated PSU, I2C EEPROM to store preamp cal/gain data
* Make cable to interconnect preamp with your preamp board
* Ensure your meter have B-firmware.
![DMM :-DMM](https://www.eevblog.com/forum/Smileys/default/smiliey_dmm.gif)
* Plug preamp addon board into meter, initialize preamp's EEPROM by
using secret menu, article here.
2001 have to have B-firmware, not A-firmware, as only B-firmware supports preamp functions. Model 2002 A-firmware is OK for preamp.
There are no modify to multimeters itself.
![Wink ;)](https://www.eevblog.com/forum/Smileys/default/wink.gif)
I'm ready to provide all support you need for this project, just keep it up, as it's pure rare animal.
![ThumbsUp :-+](https://www.eevblog.com/forum/Smileys/default/icon_smile_thumbsup.gif)
If you feel complexity of doing all this is over the top - let us know, I'm sure we could do this project together.