This application is a great reference for electronics engineers. This application contains 86 guides and calculators for various areas of electronics.
It contains calculators for circuit designers to help quickly solve following calculations:

AC/DC circuits - Calculation of power circuits, regulators and voltage dividers
- Omn law
- Power, voltage and current
- Resistive voltage divider
- Time constant capacitor calculator
- Battery Life

- Power source internal resistance
- Additional resistor for voltmeter
- Shunt resistor for ammeter

Resistors - Color and digit codes, E-series
- Resistor color codes
- Resistor color codes
- SMD resistor codes
- SMD resistor codes
- EIA-96 Encoding
- Standard values finder for resistors
- Series resistors
- Parallel resistors
- E series

Capacitors - Color and digit codes, capacitors connections
- Ceramic disc capacitors codes
- Ceramic disc capacitors codes
- Film capacitors codes
- Film capacitors codes
- Voltage code
- Film capacitors color codes
- Film capacitors color codes
- SMD Tantalum electrolytic capacitors codes
- SMD Tantalum electrolytic capacitors codes
- Series capacitors
- Parallel capacitors

Inductors - Color and digit codes, inductors connections
- Inductor color codes
- Inductor color codes
- SMD inductors codes
- SMD inductors codes
- Series inductors
- Parallel inductors
- AC parameters and rectified value
- Half-wave rectifier
- Full-wave rectifier
- Bridge rectifier

Power supplies - Rectifiers, stabilizers, current sources
- Capacitive power supply
- LM317 Voltage regulator calculator
- LM317 Current Source calculator
- Zener reference voltage source
- TL431 voltage calculator

LEDs and displays - Connection of LEDs, displays, decoders for displays
- LED Single Resistor calculator
- LED Series Resistor calculator
- LED Parallel Resistor calculator
- 7-segment LED display
- Decoder (driver) for 7-segment displays CD4511

Radio-frequency - Reactance, Decibels/Watts, dividers, attenuators
- Capacitor reactance
- Reactance of an inductance coil
- Gain conversion to decibels
- dBm to Watts conversion
- T-Attenuator
- Pi-Attenuator
- L-Attenuator
- Bridged T-Attenuator
- Capacitive AC Voltage Divider
- Inductive Voltage Divider
- Frequency and wavelengths

Analog filters - Calculation Low/High and Bands passive filters
- RC Low Pass Filter
- RC High Pass Filter
- RC Band pass filter
- RL low pass filter
- RL high pass filter
- LC Low Pass Filter
- LC High Pass Filter

Operating Amplifiers - Calculation of non-Inverting and inverting amplifier gain
- Non-Inverting OP Amplifer Gain calculator
- OP Inverting OP Amplifier Gain calculator
- Inverting OP Amplifier with T-Bridge
- Inverting summing OP Amplifier
- Differential OP amplifier
- OP Voltage integrator
- OP Voltage Differentiator
- OP Voltage comparator

Multivibrators - Circuits that generated a rectangular waveform
- Astable multivibrator
- Monostable (waiting) multivibrator
- Bistable multivibrator
- NE555 Astable Multivibrator
- NE555 Monostable Multivibrator

Logic elements - Logic decisions of NOT, AND, OR etc.
- AND logic gate
- OR logic gate
- NOT logic gate
- NAND logic gate
- NOR logic gate
- XOR logic gate
- XNOR logic gate

This app can switch between light and dark themes, and also is translated into 6 languages:
- English
- French
- German
- Russian
- Spanish
- Ukrainian
This application's contents and languages are updated in new versions.