Bench & Diagnostics Tools
Interactive workbench utilities for electronics repair, component identification, and circuit diagnostics
Resistor Color Code Calculator
Select band colors to decode resistance values. Supports standard 4-band and precision 5-band resistors.
Capacitor SMD Code Decoder
Enter a 3-digit or 4-digit SMD capacitor marking code to decode the capacitance value.
RF & Wireless Protocol Reference Sheet
Comprehensive reference covering RF frequencies, IR protocols, NFC/RFID, Wi-Fi, Bluetooth, and mesh networking standards. Filter by category or keyword, then click a card to expand modulation details, chipsets, and diagnostic tips.
How to Use This Tool
This interactive visualizer models a typical microcontroller power and signal distribution circuit. Use it to explore how each stage works, probe signals with a virtual oscilloscope, and simulate common hardware faults.
Explore the Schematic: Click any circuit block (Power Input, V-REG, MCU, Oscillator, Output Stage) to inspect its operating parameters, key components, and recommended diagnostic tools in the side panel.
Probe with the Oscilloscope: Click a Test Point (TP1–TP5) on the schematic to connect the virtual probe. The oscilloscope canvas below will render a live animated waveform for that signal. Use the Volts/Div and Time/Div sliders to zoom in/out, and the Hold button to freeze the display.
Simulate Faults: Toggle the Fault Simulation switch, then select a fault scenario from the dropdown. The affected block turns red, downstream signals distort or flatline on the scope, and a diagnostic drawer appears with observed symptoms, step-by-step test procedures, and suspect components for replacement.
Signal Flow Schematic
Virtual Oscilloscope
Block Inspector
555 Timer Astable Mode Calculator
Calculate frequency, period, duty cycle, and high/low time for a 555 timer in astable (free-running) mode. The waveform preview updates in real-time.
LED Series Resistor Calculator
Calculate the correct current-limiting resistor value, nearest E24 standard value, power dissipation, and recommended wattage rating for an LED circuit.
Interactive Connector & Pinout Guide
Select a common connector type to view its pin-level diagram. Click any pin on the SVG diagram to inspect its signal name, electrical specification, and wire color standard.
Ohm's Law & Power Wheel
Enter any two known values to instantly solve for the remaining two. The formula used for each result is highlighted below.
Retro Hardware Diagnostic Flowchart
Choose a machine and a symptom, then work through each test with a multimeter or logic probe. Every step names the exact chip, pin number and expected reading. The pinout inspector on the right shows the chips referenced by the current step — click a pin for its signal and voltage. When you reach a diagnosis, copy the summary to share on a retro computing forum.