Electronics projects

Forte 600: LDMOS HF+50m Linear Amplifier A 600 W Linear amplifier using MRF300 transistors. This project includes not only the RF deck but also set of LPFs, controller, TX/RX board as well as mechanical aspects.
Rhapsody SDR Transceiver This project aims to develop modular SDR amateur radio transceiver. Heart of the project is the zero-IF SDR trx based on STM32 microcontroller and tayloe IQ mixer. Because of modularity additional modules could added such as hardware IF or band pass filters for improved selectivity, transverters for adding VHF/UHF bands, preamplifiers, improved mixers for better linearity and sensitivity etc. Think of base station trx designed as good old PC computer, you can buy it in basic form and upgrade it later on.
Digitally controlled AM Signal Generator Single PCB signal generator with AD9833 DDS and MC1496 balanced modulator. Whole device is controlled by AT328p running Arduno code. Great low cost tool for fixing and tuning old AM radios as well for eduction.
S.O.N.A.T.A. Vacuum Tube Tester and Analyzer Switching Oriented Numerical Automated Tube Analyzer is my open source project of a modern tube tester/ analyzer that can plot characteristics on PC. It is based on modern 32 bit microcontroller with 10 bit ADC and uses switching mode power supplies so it does not require dangerous transformer with high voltage taps.
High voltage current sensing This is a small sub-project related to the SONATA tube tester. This circuit is capable of direct current measurement in two ranges for input voltage from 55 V to 300 V.
20M Band SSB Transmitter: Adagio 20 This is a simple SSB transmitter that uses filter method. I have never brought this transmitter on the air, however I have preceisly meassured every part of it as my engineering thesis.
Virtual Theatre Organ MIDI Stops Controller This device is a MIDI controller that can scan stops from a pipe organ and send MIDI commands to a computer running virtual organ software like Miditizer or Hauptwerk.
EC Fan Controller Speed controller for a electronic commutator (EC) type of motor.
Johnny 5: Robot That Avoids Obstacles Using FreeRTOS Miniature of a robot from Short Circuit movies. This time nr. 5 is alive due to an open source real time operating system on STM32.
Yet Another Nixie Tube Clock Nixie tube clock based on arduino, some pin expanders, nixie decoders and most important: NE555 boost converter!
Superheterodyne Radio Using Vacuum Tubes 1920s themed home made radio using 1950s srap parts. I have also made more sucesfull heterodyne on a metal chassis. Both are presented on my YT channel.