The NOC2K is a miniature oscilloscope platform built around the 32-bit LPC2144 microcontroller (NXP), leveraging its internal dual 1 MSps ADCs and 16 KB RAM for efficient signal sampling and buffering. Its compact form factor (50×70×25 mm) and simplified design make it ideal for portable use and educational setups.

Two key innovations define the NOC2K architecture:

• Quadrature-capable dual-channel acquisition, made possible by the MCU’s independent ADCs, ensuring signal integrity and channel separation.

• Built-in USB communication, eliminating the need for external interface chips.

Analog signal conditioning is handled via a differential input stage using AD8602 op-amps, while offset control is achieved using an internal PWM-based DAC filtered and amplified by an LM358. Sensitivity control is digitally managed via 74HC4066 analog switches, and mode switching is controlled by a bistable relay.

Firmware was written in C++, optimized for real-time sampling, buffering, and USB transmission. The system is supported by two PC applications:

• xOC2K – A full-feature oscilloscope interface offering traditional analog scope functions plus advanced tools like FFT analysis, FIR filtering, mathematical operations, cursor-based measurements, and data export/import.

• rOC4K – A long-term recorder capable of saving data at up to 10 kHz sampling (limited only by disk size), with FFT calculation on datasets up to 65,536 samples using averaged windows.