David N8DAH is now producing a very handy digital interface kit. This is a Gordon Gibby KX4Z design, and it features:
- On board 5v regulator that you can power from 12-13.8v or you can leave it off for direct 5v input.
- Built in VOX PTT via reed relay
- PTT LED
- Input and Output gain control
- Audio Isolation transformers 600:600ohm
The kits are available for:
US$15 unassembled or US$20 assembled
https://shop.kit-projects.com/index.php?route=product/product&path=59&product_id=120