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Revision as of 17:23, 5 March 2022 by Ok1zia (talk | contribs) (Windows)
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Davac 4.1 OK1ZIA

Davac 4.1 is updated version of Davac 4.0 designed in 2008.


  • IRLML2246 instead of IRF7220
  • Silscreen cleanup
  • Values on silkscreen
  • Jack holes are 2 mm
  • Guard ring connected to GND
  • Manufacturing data for jlcpcb.com included

Circuit diagram

Circuit diagram of Davac 4.1


Davac4.1-jlcpcb.zip Gerber files to order PCB at jlcpcb.com.

If you have extra pcs and want to help other Tucnak users, let me know, I will announce here.


Transformer TR-1/1 www.tme.eu

Jack 6.35 K3606D www.gme.cz or K36092B

White connectors for cable pins

Black connectors for cable flat cable

Program the FT232R

As default, the FT232R acts as serial port. But Tucnak uses Libftdi to access it in bitbang mode. Default VID:PID must be changed to distinguish Davac from other USB serial ports.


I'm pretty sure you can use ft232r_prog. But I have no experiences with it. If you try it, please let me (OK1ZIA) know, I will update this information.


MProg with loaded Davac4.ept

Under Windows, use MProg. Download File:Davac4.ept and open it in MProg. Note on Windows XP you need D2XX drivers; on newer versions they are installed automatically.

Unplug all other FTDI devices and press the Program All Existing Devices button.

Install USB drivers


You have nothing to do, It will work automatically. Only on specific distributions you may have to set permissions to USB device, which is normally done by udev script.


Zadig with Davac4

Under Windows 7 or newer, use Zadig. On XP use 2.2.

Click Options, List All Devices.

Choose WinUSB and press Install Driver.