Hamcom multimode interface
Nothing spectactular but this description may help you speeding up your own construction. The circuit is based on the traditional HAMCOM interface but uses 2 OP amp to ensure better detection.
The circuit is build in a 57x72 mm large enclosure.
This interface can be used in almost every digital mode. I used it in SSTV, RTTY, CW, ASCII with several different softwares.
Even if the sound card now outperforms and replaced it at my own station, it is still sometimes useful !
You can download the following files to be iused with the free EAGLE layout editor.
(c) TK5EP 1998-2012- Designed for Firefox 2 and IE 7