Davac5

Davac 5 is new design of voice/SSB keyer for Tucnak. Although version 5 may appear to be a successor to version 4, is not true. It brings some advantages but also lacks some features.

To choose the version that best suits your requirements, please look at the table:

Davac versions comparsion

	Davac 5	Davac 4
Size	small	bigger
Drivers required	No	Yes
Isolated	No, use the USB isolator	Yes
Band output	No	Yes
USB	Micro-B	A
Soundcard	Is the soundcard itself	Uses PC soundcard
Audio cables	Shorter	Longer
Modulation relay	Solid SPST	Mechanical SPDT
Separated grounds	No	Yes

Photos

Recommended assembly is stencil, paste and reflow oven

Features

• Simple assembly
• All parts are SMD
• Designed for SMD reflow
• 3.5 jacks
• 3D printed box
• SMD LEDs + light guides on the top side
• power supply from USB

Circuit diagram

Circuit diagram of Davac 5.0

Connecting to the radio

• MOD - modulation output to the microphone input of radio
• PTT - Push to talk output to switch Radio to the transmit (active low)
• GND - One ground (ground plane on the bottom layer)