1 x XR2206 Function Generator DIY Kit Sine, Triangle, Square Output 1HZ-1MHZ +CASE. Frequency: 1Hz - 1MHz. Flatness: +0.05dB 1Hz - 100kHz. Waveforms: Square, Sine & Triangle. TRIANGLE WAVE. Distortion: Less than 1% (at 1kHz).
eBay