Who needs a collection of interface connections to choose from when having a desire to use the Soundboard in their computer to provide capability for using RTTY, PSK31, and SSTV modes on the amateur bands? Well from my experience the answer is many of us, me included. After a large amount of research I found the following circuits helpful when setting up my own system. If you have problems setting input and output levels to your sound card you should consider a resistive pad in the input or output circuits as shown in following interfaces. Do you need the pad? Well consider my level discussion ( click here). Hope these interface circuits and level discussions are of some value to all. Nothing like ideas you know.
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