Free calculators and simulators for learning and design
Explore astable, monostable, and bistable modes with real-time waveform visualization and component value adjustments.
InteractiveCalculate frequency, duty cycle, and timing values for 555 timer circuits in astable mode.
CalculatorSimulate one-shot pulse generation with adjustable timing resistors and capacitors.
SimulatorInteractive 555-based computer clock with adjustable frequency and logic level visualization.
AdvancedDecode 4-band and 5-band resistor color codes with visual representation and tolerance information.
EssentialCalculate equivalent resistance for multiple resistors in parallel configuration.
CalculatorCalculate safe operating limits and fusing current for fusible resistors in power circuits.
SafetyCalculate voltage, current, resistance, and power using Ohm's Law with interactive formula display.
FundamentalCalculate the perfect current limiting resistor for your LED circuits with voltage drop and power dissipation.
PopularDesign voltage divider circuits with automatic resistor value calculation and output voltage prediction.
DesignSimulate voltage-dependent resistor behavior for surge protection circuit design.
ProtectionInteractive potentiometer simulator with real-time resistance and voltage readings as you adjust the dial.
InteractiveDecode potentiometer markings and 3-digit codes to determine resistance values and tolerances.
ReferenceDecode SMD resistor codes including 3-digit, 4-digit, and EIA-96 marking systems.
SMDInteractive breadboard design tool for building 6502 computer circuits. Based on Ben Eater's tutorial series.
Advanced