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DSO138 was designed as a training oscilloscope kit. It contains only the basical oscilloscope functions with no fancy features. 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 in combination with troubleshooting guide and schematc. 

Major features of DSO138: 

Number of Channel: 1

Analog Bandwidth: 0 - 200KHz

Sensitivity: 10mV/Div - 5V/Div

Sensitivity error: < 5%

Resolution: 12-bit

Input Impedance: 1M ohm

Maximum Input voltage: 50Vpk

Coupling: DC, AC, GND

Horizontal

Max Real-time Sampling Rate: 1Msps

Timebase: 10us/Div - 500s/Div

Record Length: 1024

Trigger

Trigger Modes: Auto, Normal, Single

Trigger Types: Rising/falling edge

Trigger Position: 1/2 of buffer size fixed

Display

2.4-inch color TFT LCD with 320 x 240 resolution

Power Supply

9V DC (8 - 12V acceptable)

Supply Current: 120mA

Physical

Dimension: 117mm X 76mm X 15mm

Weight: 70 gram (not including cables)