DSO138 was designed as a training oscilloscope kit. Simplicity in structure and easiness in assembly/operation are among the main targets of the design. For these purpose DSO138 uses mostly through-hole parts. The heart of DSO138 is a Cortex-M3 ARM processor (STM32F103C8) from ST. It uses 2.4-inch TFT LCD (320 X 240 dotmatrix, 262K colors) as its display element and displays nice and clear waveforms. Detailed assembly instructions are provided, along with a troubleshooting guide and schematic. Source code is also available to allow user to add their own features. This DSO13803K kits have all the SMD parts pre-soldered. The MCU has been pre-programmed and no re-programming required. Major features of DSO138: Analog bandwidth: 0 - 200KHz Sampling rate: 1Msps max Sensitivity: 10mV/Div - 5V/Div Sensitivity error: