PowerScope

Preliminary Design of a Portable Dual-Channel Digital Oscilloscope and Programmable DC Power Supply

Abstract

This paper presents the preliminary system architecture and circuit-level design of PowerScope, a proposed portable instrument that combines a two-channel digital oscilloscope with a programmable DC power supply. The oscilloscope path uses protected and selectable-range analog front ends, a dual 14-bit AD9251 analog-to-digital converter, a planned FPGA capture stage, and an ESP32-S3 supervisory controller for display and wireless monitoring. The power path uses a four-cell lithium-ion battery, battery monitoring and protection, a charger interface, and an LM5176-based buck-boost converter targeted at 1–15 V and up to 2 A. The paper reports analytical calculations for input scaling, ideal anti-alias response, sample throughput, record memory, converter sizing, and sampling/aliasing behavior. Draft schematics and design tables are included in monochrome form. The available project records do not contain completed Proteus simulations or hardware measurements; calculated values are therefore distinguished from results requiring validation. Conflicting bandwidth and sampling-rate baselines, analog-filter placement, converter current limiting, and several unselected digital interfaces are identified as open design decisions.