Circuit Calculator™ App for Android
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The inventions and products featured on these pages were chosen either for their uniqueness in the RF engineering realm, or are simply awesome (or ridiculous) enough to warrant an appearance.

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RF Cafe visitor Dmitriy recently wrote to let me know about the extensive suite of electronics circuit design apps he created for Android smartphones. There is the Circuit Calculator app with 170⁺ circuits for design, 50⁺ electronics calculators, 20⁺ application notes, and a logic solver. The Power Stage Design Tool is for switch mode power supplies. Filter Designer handles multi-stage analog active filters, and there is a stand-alone Resistors app. He even has a Cost, Please! app for tracking travel-related costs. I could be wrong, but it appears most of the capability of the other two design apps is included in Circuit Calculator. All apps work offline without an Internet connection. Files sizes are significantly smaller than similar apps.

Does the world need yet another circuit design app when so many already exist, you might ask? According to Dmitriy: "There is a list of well-known electronics design tools for Android which can be found in every review for the last 10 years: 'Electrodoc,' 'Every Circuit,' 'Droid Tesla,' 'Electronics Toolbox,' 'RF & Microwave Toolbox,' and so on. Also, there is a lot of trash on the market that turns finding a good tool into a quest."

Per Dmitriy:

"A common device has an MPU, high-speed interfaces, an ADC and DAC with analog front-end. So, an engineer needs to design amplifiers, drivers, filters, power circuits, calculate PCB trace geometry to meet impedance and current requirements. 'Circuit Calculator' is intended to solve these tasks.

[The] current version includes more than 150 circuits for design and more than 50 calculators.

Nowadays most tools are online and require a large screen.

This tool works on small size Android devices and without the Internet."

Here are a few screen captures of the calculators taken from an extensive online review of Circuit Calculator on the Habr Blockchain website. Some calculators not shown here of particular interest to RF Cafe visitors are microstrip impedance and dimensions, free space path loss, air core inductors, skin depth, coaxial cables, attenuators, wavelength-frequency, and RF shield resonances.

November 20, 2022 Update: Dmitriy provided these additional screen shots of some of the RF / microwave calculators.

Microstrip, Stripline, Edge-Coupled

Elliptical Bandstop Filter

Printed Inductor LC Transformations

Path Loss Coaxial Cable Air Inductor

"Circuit Calculator" Logic Circuits - RF Cafe Website "Circuit Calculator" Noninverting Amplifier Design - RF Cafe Website

Logic Circuits Noninverting Amplifier

"Circuit Calculator" Push-Pull Converter Design - RF Cafe Website

Push-Pull Converter Designer Input Screen and Output Graphs

"Circuit Calculator" Lowpass Active Filter Designer - RF Cafe Website "Circuit Calculator" Step Attenuator Designer, by vdv - RF Cafe Website

Lowpass Active Filter Designer Step Attenuator Designer

"Circuit Calculator" Matching Circuit Designer, by vdv - RF Cafe Website

Matching Circuit Designer

Disclaimer: Neither I (Kirt B.) nor RF Cafe has any affiliation with the products presented on this page, either technically or financially.

Posted November 17, 2022

Johanson Technology Prototyping Kit - RF Cafe

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a lady's voice announced "You've Got Mail" when a new message arrived...