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Revision as of 16:02, 31 March 2019 by Ok1zia (talk | contribs) (Parts)
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Davac 4.0 OK1ZIA

Davac 4 was succesfully built by OK1USW, OK1UGE and OK2JTB.

Circuit diagram

Circuit diagram of Davac 4.0


Note: 600 DPI have images in Full resolution, MediaWiki uses thumbnails.

PCB www.hamshop.cz


Ondra OK1CDJ has made PCBs and offers it at www.hamshop.cz. Many TNX!


  • Jack holes are slightly smaller - user Dremmel milling cutter
  • Parts values would be shown - use schematic


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.


MProg with loaded Davac4.ept

Under Windows, use <a href="http://tucnak.nagano.cz/download.php#mprog>MProg</a>. Download File:Davac4.ept and open it in MProg.

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

SMT variant by OK2JTB

All data: File:Davac4-ok2jtb.zip

Made by OK1UDC(SK) & OK1UGE

Note OK1ZIA: better use USB-B type connector

Combined Davac4 and contest machine RPi

Guys from OK1RPL made this amazing compact contest solution.