SMAKN&reg; DDS Function Signal Pulse Generator Sine Square Sawtooth Triangle ECG Wave Operating voltage: DC 5V, DC 12V. High-speed frequency (HS) output up to 8MHz. DDS signal amplitude of the offset amount can be adjusted separately by two potentiometers. DDS signals: sine wave, square wave, sawtooth, reverse sawtooth, triangle wave, ECG wave and noise wave. 216 LCD menu.