Featured Product Archive
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
 
Logic Circuits
Noninverting Amplifier
 
Push-Pull Converter Designer Input Screen and Output Graphs
Lowpass Active Filter Designer Step Attenuator
Designer
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
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