Electronics Toolbox

Peter Ho

Contains adsIn-app purchases

About this app

This app is a collection of basic electronic calculators. It is suitable for hobbyist, electronic engineers or professionals.

You can buy the PRO feature to unlock more features.


Basic tools
• Resistor color code
• Inductor color code
• Resistor SMD marking & EIA-96
• dBm, dbW, dBuV converter
• Resistors in series
• Resistors in parallel
• Two resistors in ratio
• Voltage divider
• Ohm's law
• Y-Δ converter
• L, C reactance
• Complex number operation
• RC charging time constant
• RC filter
• RL filter
• LC circuit
• 555 monostable
• 555 astable
• Wheatstone bridge
• Trace width calculator
• Battery capacity
• Operational amplifier
• LED calculator
• RMS calculator
• Range calculator
• Temperature conversion
• BJT bias voltage
• Voltage regulator
• Shunt regulator
• Length converter
• Limit 10 combinations of component values


Digital Tools
• Number converter
• Logic gates
• DAC R-2R
• Analog-to-digital
• 7-segment display
• Minimization of boolean function
• Half adder & full adder
• Synchronous counter up to 6 states
• Cyclic redundancy check CRC-8, CRC-16, CRC-32
• Hamming code


Electronics resources
• SI unit prefix
• Physical quantities
• Circuit symbol
• ASCII table
• 74xx series
• CMOS 40xx series
• Pinouts
• C programming language
• Python language
• Common linux command for Raspberry Pi
• Resistivity table
• Permeability table
• Permittivity table
• Ampacity table
• AWG table
• Standard wire guage (SWG) table
• World plug
• EDA software
• Flip-flop
• SMD marking
• Formulas

Features in PRO version only
• No Ads
• No limitation of component values
• Selectable 1%,5%,10%,20% of values
• Complex matrix
• Pi-pad attenuator
• T-pad attenuator
• Coil inductance
• Poles & zeros calculator


Note :
1. For those who need support please email to the designated email.
Do NOT use either the feedback area to write questions, it is not appropriate and that is not guaranteed that can read them.

All trade names mentioned in this app or the other documentation provided by this app are trademarks or registered trademarks of their respective holder. This app is not related or affiliated in any way these companies.

Ratings and reviews

Love it. More useful than anything I have ever seen. When I first downloaded it I only skimmed through it. Since then I started on a project, I remembered I had this app. I was able to quickly figure out how it worked and able to find the values I needed without all the maths or searching online. If an idea pops in your head, you can open this app and bounce some configurations around. Very handy tool app.

This is brilliant. Really, when I saw how many things are in this app, I was mindblown. Nevertheless there is one detail I noticed that someone could easily miss in my opinion: the physical quantities and units table is great (although there's a typo - kevin instead of kelvin) but I think that it would be nice to add also expressions of given units in SI base units. And I don't know if you're planning it, but adding a list of some useful physical constants would be another welcome improvement.

Very good reference app!!!... 💜

What's new

5.5.05
- Fix minor bugs

4.4.5
- Support landscape mode in tablet

4.0.5
- Support dark theme

4.0.0
- Remove storage permission