Voltcraft dds 3005 usb dds function generator module voltcraft 91028c1 the voltcraft dds 3005 function generator uses direct digital synthesis dds to generate arbitrary waveforms up to 5 mhz defined by a connected pc via usb in addition to the freely definable arbitrary functions standard signals such as sine square triangle saw tooth ttl noise trapezium and exponential are available as well as am and fm the generator has two frequency counter inputs one from dc to 25mhz with sep