The circuit prototyper
toolbox.
Check ideal dividers, filter responses and small circuit building blocks.
12 useful places to start.
Ideal circuit models with explicit units. Component ratings, construction details and real-device limits need the relevant specifications.
Loaded voltage divider
Calculate a resistor divider with an optional load across its lower resistor.
Two-branch current divider
Split a supplied total current between two ideal parallel resistors.
LED series resistor calculator
Estimate the ideal resistor and dissipation for a low-voltage DC LED string.
First-order RC filter
Find the ideal cutoff, gain and phase of an unloaded RC low-pass or high-pass filter.
RL current rise calculator
Explore an ideal series RL step response and stored magnetic energy.
LC resonance calculator
Calculate an ideal LC resonant frequency and the series-RLC quality factor.
Series RLC impedance
Calculate impedance, RMS current, phase and real power for an ideal series RLC circuit.
Ideal op-amp gain
Compare ideal inverting and non-inverting closed-loop amplifier results.
555 astable timer calculator
Estimate standard 555 timing, frequency and high-state duty cycle.
Resistor colour code reader
Decode four- or five-band resistor values and tolerance limits.
Resistor tolerance checker
Compare a set of measured resistances against a nominal value and tolerance.
Ohm’s law calculator
Calculate current and resistor power from voltage and resistance.
A few things you
can tick off.
- Check loading on a voltage divider
- Compare low-pass and high-pass gain
- Decode resistor bands and tolerance