And another push switch is provided to monitor Rig (Radio) Speaker output. (requires a speaker connected on this switch, not included in kit)
You have choice to use this interface with or without DC Power. It will work equally well in both situations. Great for your Portable Rigs.
Since most people do not require a PTT relay, Reed Relay may be ordered as an option.
Two reed relay options are available: 5V and 12V.
5V reed relay is required where supply voltages are below 12V. 12V Reed Relay is standard with most desktop supply source of 12-13.8VDC.
If 5V reed relay is used, a series resistor would be required, which may be placed instead of Diode D6 (1N4001).
A new sound card interface, SC2, is under development. New design will be using RJ45 sockets and smaller SMT Transformers.