SDO Viewer vs Electronics Circuit Simulator

SDO Viewer is a simple application for downloading and displaying the latest images taken by the Solar Dynamics Observatory (SDO). It includes push notifications so you can be notified by a badge on the application when new images are available. SDO Viewer, by the creator of SoHO Viewer. Courtesy of NASA/SDO and the AIA, EVE, and HMI science teams.

This app is a complete electronics workbench on your iPhone and iPad. Build circuits on an interactive schematic editor, simulate them with real Modified Nodal Analysis, and learn electronics through hands-on exploration. VERSION 2.0 — WHAT'S NEW: CIRCUIT CHALLENGES Test your electronics knowledge with 9 interactive puzzles across 4 categories — Basics, Analysis, Design, and Troubleshooting. Each challenge provides a starting circuit you must modify to meet specific goals, with built-in validation that checks your simulation results. ELECTRONICS CALCULATOR Seven quick-access calculators: Ohm's Law, Voltage Divider, RC Time Constant, LED Resistor Sizing, Power Dissipation, Parallel Resistance, and Series Capacitance. All with real-time results in engineering notation as you type. OSCILLOSCOPE VIEW Dual-channel waveform visualizer with sine, square, triangle, and sawtooth signals. Adjustable frequency, amplitude, DC offset, and timebase — complete with graticule, tick marks, and measurement readouts for Vpp, Vrms, frequency, and period. CORE FEATURES: Schematic editor with tap-to-place components and L-shaped auto-routing wires DC circuit simulation using Modified Nodal Analysis with Newton-Raphson iteration 50+ electronic components across 10 categories 20+ pre-built common circuits ready to load and simulate Virtual multimeter with voltage and current probes Undo support, save/load circuits, rotate and edit component values Comprehensive Electronics Guide covering fundamentals, components, formulas, and safety Interactive tutorial for new users Built entirely in SwiftUI. No internet connection required. No ads. No subscriptions.