# Electronics docs & calcs — Electronics lab in your pocket

> Electronics reference and calculation tool for engineers and hobbyists. (iPhone/iPad app by Anas Abubakar.)

- Source: https://appshunter.io/ios/app/electronics-docs-and-calcs/id1581885136 (this page in markdown: same URL + `.md`)
- Developer: [Anas Abubakar](https://appshunter.io/developer/1581534101)
- Category: Education, Reference
- Price: Free
- Rating: 4.00/5 from 16 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 57 MB
- Languages: American English, French (France), German (Germany), Italian, Japanese, European Portuguese, Russian, Chinese (Simplified, China), European Spanish
- Released: 2021-08-21
- Data updated: 2026-08-23
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/electronics-docs-and-calcs/id1581885136/reviews.md

## What is Electronics docs & calcs?

Electrohelper is carefully designed to address the need for electronic engineers and electronics hobbyists in designing an electronic circuit. 
The app contains the electronic components reference section, electronic circuit reference section, and electronic circuit calculation section. 
Tedious electronic circuit calculation such as Butterworth, Sallen-Key, Chebychev, and Bessel filter is made easier with the app. 

Electronic components section:- 
- Resistor 
- Capacitor 
- Inductor 
- Transient voltage suppressor(TVS) 
- Rectifier diode 
- Signal diode 
- Zener diode 
- Bipolar junction transistor(BJT) 
- Metal oxide field effect transistor(MOSFET) 
- 555 timer 
- Operational amplifier (Op-amp) 
- Arduino boards (arduino uno and arduino nano) 
- Atmega 328 
- Voltage regulator integrated circuit(IC) 
- Multiplexers 
- Demultiplexers 
- Encoders 
-Decoders 
- Flip-flops 
- Counters 
- Shift registers

           Electronics calculator section:-

- NE555 timer Astable multivibrator 
- NE555 timer monostable multivibrator 
- Bipolar junction transistor (BJT) analysos 
- Inductor winding 
- Toroidal inductor winding 
- Transformer winding  
- Butterworth, Bessel, Chebychev passive filter calculator 
- Sallen - Key active filter calculator
- Inverting, noninverting and difference operational amplifier calculator
- Resistor in series calculator 
- Resistor in parallel calculator
- Capacitor in series calculator 
- Capacitor in parallel calculator
- Capacitance of a capacitor calculator 
- Resistance calculator 
- Series LRC circuit impedance and reactance calculator 
- Parallel LRC circuit impedance and reactance 
- Charging and discharging a capacitor  
- Charging and discharging an inductor 
- Polyester film capacitor code 
- Ceramic capacitor code 
- Resistor color code 
- Air core inductor 
- Voltage divider
- Current divider
- Ohms law (current, voltage and resistance relation in a circuit) 
- Delta to star resistor network conversion
- Star to delta resistor network conversion 
- Light emitting diode (LED) resistor calculator  
- Double pole Sallen - Key 
- Butterworth filter components value calculator 
- Surface mounted (SMD) resistor code calculator 
- Pi, Tee and Bridge attenuator
- Radio frequency(RF) calculator 
- Alternating current (AC) power 
- Direct current(DC) power

## Key features

- Electronic component reference
- Electronic circuit reference
- Filter design calculators
- Inductor winding calculators
- Transformer winding calculators
- Resistor and capacitor calculations
- Ohm's law and power calculations

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/electronics-docs-and-calcs/id1581885136/reviews.md

### 1/5 — bad

*2026-06-03*

as usual, it doesnt include the most essential thing about transformers: the EMF equation. [V=√2πfNAB(max)] which is an extremey ignorant thing to do. education doesnt come from blindly repeating phrases! according to the "equations" you have in your "transformer calculator": i can use 1 turn on the primary side of a mains transformer and use 10 turns on the seconday to get 10 times as much voltage!  but when you say this to these people, they blindly repeat "noo! low reactance makes short!" without knowing what are they talking about! like sheep!!! they cant explain why you cant use 1 turn on the primary! and when someone wants to know why, they will have a hard time searching for a reasonable reason. 

the review is getting too long, so if YOU want to know the reason why you cant use 1 turn (and why MOTs saturate), copy the equation and ask google why you cant use 1 turn, then tell him to explain using this equation, then explain the equation itself. and dont forget to tell him what type of core you are using (iron or ferrite (because this equation works for high frequencies, too!))

V = √2×π×f×N×A×B

### 1/5 — Too much ads

*2025-01-26*

Too much ads you don’t have a chance to do anything on the app

## Frequently asked questions about Electronics docs & calcs

### What types of electronic components are included in Electronics docs & calcs?

Electronics docs & calcs includes a wide range of components such as resistors, capacitors, inductors, diodes, transistors (BJT and MOSFET), 555 timers, operational amplifiers, Arduino boards, and various integrated circuits like multiplexers, decoders, and flip-flops.

### What circuit calculation features does Electronics docs & calcs offer?

The app provides calculators for NE555 timer configurations (astable and monostable), BJT analysis, inductor and transformer winding, various passive and active filter designs (Butterworth, Sallen-Key, etc.), resistor and capacitor series/parallel combinations, LRC circuits, voltage and current dividers, and Ohm's law.

### Is Electronics docs & calcs suitable for beginners?

Yes, the app is designed for both electronics engineers and hobbyists, suggesting it can be beneficial for beginners looking to learn and design circuits. Its comprehensive reference and calculation sections can aid in understanding electronic principles.

### How often is Electronics docs & calcs updated?

The app was last updated on June 30, 2025, indicating recent development. It has had two versions released, suggesting a commitment to ongoing improvement and feature additions.

### What devices support Electronics docs & calcs?

Electronics docs & calcs is supported on iPhones, iPads, and iPods, making it accessible to a wide range of Apple mobile device users.

### Does Electronics docs & calcs have ads?

No, Electronics docs & calcs does not contain advertisements. This allows for an uninterrupted user experience while referencing components or performing calculations.

### What is the user rating for Electronics docs & calcs?

Electronics docs & calcs has a strong user rating of 4.4 stars, based on 13 ratings. This indicates a generally positive reception from its users.

### Can Electronics docs & calcs help with filter design?

Yes, Electronics docs & calcs features calculators specifically for designing various types of filters, including Butterworth, Bessel, Chebychev passive filters, and Sallen-Key active filters. It can calculate component values for these designs.

## Version history (last 5 releases)

### 6 — 2026-08-17

Few bugs fixed, improved the UI

### 5 — 2026-08-04

improved the user interface, added more calculators and simulators

### 4 — 2026-07-28

improved the user interface, added more calculators and simulators

### 3 — 2026-07-22

improved the user interface, added more calculators and simulators

### 2 — 2025-06-30

Improved UI and fixed bugs for a smoother experience.

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## More apps by Anas Abubakar

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All apps by Anas Abubakar: https://appshunter.io/developer/1581534101

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-23.*