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 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)
