Electronics Tools logo

Electronics Tools for iOS

By True Blue Apps $6.99

Developer's Description

Made by electrical engineers and hobbyists for electrical engineers and hobbyists, Electronics Tools provides solutions to a wide range of circuit calculations. From the basics (Ohms Law) to the more complex (8th order active filters), Electronics Tools has you covered with a clean and straight forward interface that provides the information you need.

For instance, suppose you wanted to find the values needed for a simple second order active filter. Entering just the frequency finds the optimum resistor and capacitor values in five tolerance bands and gives you the minimum and maximum corner frequencies for each tolerance. Optionally, you can enter additional values, such as the resistor value, and the remaining values will be calculated. Every calculation provides the information that you need to know when working with your circuits.

On smaller screens such as an iPhone, the calculation results can be fully displayed by tapping the Show button. The display can also be split showing the data entry area and its schematic along with a scrolling partial view of the results.

Electronics Tools includes calculators for:

Basic Calculations


Capacitance reactance

dB - Voltage

dB - Power


Inductance reactance

LC resonance

LED series resistor

Ohm's Law

Other Multipliers

Parallel and series capacitor value

Parallel and series inductor value

Parallel and series resistor value

Phase-delta t

RMS-peak-peak to peak


FET cheat sheet (Reference)

Resistor Color Code Decoder

Resistor Color Codes Article (Article)

Resistor Value Check

Resistor Value to Color Code

SMD resitor marking to and from value

Standard resistance values (Reference)







Dual Supply

Pot with Resistor Dual Supply

Pot with Resistor Ratio

Pot with Resistor Single Supply

Resistor Ratio

Single Supply


2nd Order bandpass

2nd Order bandpass Biquad

2nd Order highpass

2nd Order lowpass

4th Order highpass

4th Order lowpass

6th Order highpass

6th Order lowpass

8th Order highpass

8th Order lowpass

Filter Types (Article)

Highpass RC & RL Amplitude and Phase

Lowpass RC & RL Amplitude and Phase

Passive RC

Passive RL

Power Supply ripple (Full Wave)

Power Supply ripple (Half Wave)


Basic Gates (Reference)

Flip Flop (Reference)

Interfacing Different Logic Families (Article)


Differential Amplifier

Inverting Amplifier

Non-inverting Amplifier

Op-amp basics (Article)

Op-amp errors (Article)

Transimpedance Amplifier (Article)


555 astable (free running)

555 monostable (one shot)

Logic Gate Oscillator

Sine and Cosine Oscillator

Other References

ANSI clearance and tap

Drill Table

Wire Table

Voltage Regulators

LM317 - LM338



Circuit Snippets

Adder Subtractor

Capacitance Multiplier

Constant Current Source

Crystal Oscillator

Op-amp Bridge Drive

Parallel Op-amps

Parallel Transistors

Summing Amplifier

Voltage to Current

Full Specifications

What's new in version


Release June 18, 2020
Date Added June 18, 2020

Operating Systems

Operating Systems iOS
Additional Requirements Requires iOS 11.4 or later. Compatible with iPhone, iPad, and iPod touch.


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