Henrik's Blog

Open application Introduction I often use online impedance calculator for quick microstrip, stripline and grounded CPW line dimension calculation.

Open application I was making some radar image formation visualizations using Python and thought that it would be nice if it was instead written in Javascript and ran on my browser.

Introduction Radar drone.

Introduction VNA PCB.

Introduction Radar drone ready to take off from snow.

Introduction A while ago ordered a PCB where I made a mistake of connecting SD card to 1.8 V logic level I/O pins instead of the correct 3.3 V.

Introduction FMCW and pulse radar architectures.

Introduction The same picture decoded with SDXL-VAE 0.9 (left) and 1.0 (right).

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Introduction A radar with one transmitter and one receiver antenna can measure distances to the targets based on the time of flight of the transmitted electromagnetic wave.

Introduction This post is continuation of my previous synthetic-aperture imaging experiments.

Introduction Few years ago I did some simple synthetic-aperture radar (SAR) imaging experiments with the second version of my homemade FMCW radar.

Finished radar boards without antennas.

Introduction I have been using the OSH Park's 4 layer process a lot on my own projects.

Introduction Last year I made a simple vector network analyzer for measuring S-parameters of microwave circuits that I'm making at home.

Finisihed power detector.

Introduction Vector network analyzer (VNA) are used to measure scattering parameters of high frequency circuits.

Introduction Frequency modulated constant wave (FMCW) radar return signal from target is a sine wave and its frequency depends on the distance to target.

Finished radar boards without antennas.

Introduction For background about the radar, read the article here.

Finished radar board without antennas.

All of the best integrated circuits today come in hard to solder BGA packages.

Boundary Scan Description Language (BSDL) files are provided by many electronic component manufacturer for testing the pins of the microcontroller, FPGA or any other bigger device with JTAG.

Introduction While I was looking at some audio effect circuit schematics at the internet, I though that it would be nice to try to simulate them SPICE first and listen them, before building them to confirm if they sound good or not.

Almost finished controller board.

Ionizing radiation is something that almost anyone finds exciting (or scary) and I've also been for long wanted to build a Geiger counter.

PIC16F84 is old 8-bit microprocessor made by Microchip.

Some time ago I needed an UART for a project.

The other day I was coding an FPGA design that needed a source of normally distributed random numbers.

If you haven't been reading my last entries, I have been working on a program that tries to design a circuits using genetic algorithm that fulfill the requirements given by the programmer.

I have been writing a sparse matrix library for few weeks and for it I needed a algorithm for converting from coordinate list form(COO) matrix to compressed sparse column form(CSC).

In my first post about my evolutionary circuits project I wrote about an evolved BJT inverter.

In my previous post I wrote about a circuit that would change it's output depending on what was the spice simulations DC sweep range.

I've been playing with the electronic circuit genetic algorithm design program.

I've been working for a while on a program that automatically generates analog electronic circuits using evolutionary algorithms.

In Python it's possible to redefine some builtin values that shouldn't really be changed.

This is a blog about electronics, computers and mathematics.