RZR Mini Multiplexing Part 6 - Testing inputs and validation of design.
Testing inputs of the prototype board to validate the design.
RZR Mini Multiplexing Part 5 - Building PCB's by hand with parts on both sides of the board.
In this video I build a prototype of the multiplexer board. Stencil process, placement and reflow of a double sided board with parts on both sides. PCB stenciling, placement and reflow by hand for the prototype process.
RZR Mini Multiplexing Part 3
This is a multipart series of design, prototype and build of a small multiplexing system for UTV's. Initially this will replace lighting and winch relays with solid state control. In this part 3, I go over the base software using OSX with the STM8.
RZR Mini Multiplexing Part 2 - Testing with the STM8 Discovery Board
I explain using OSHStencil to prototype a board with double sided parts. I also discuss high side switching with a MCU. The first testing happens with two development boards from STMicro using a STM8 Discovery board.
RZR Mini Multiplexing Part 1 – A Smart Solid State Relay for Lightbar, Winch, and anything else on a UTV.
RZR Mini Multiplexing Part 1. This is a multipart series of design, prototype and build of a small multiplexing system for UTV's. Initially this will replace lighting and winch relays with solid state control. The goal is to replace the traditional use of a relay in the rzr for winch and lighting control. Later I will integrate this with canbus work for speed and gear info from the Polaris RZR to turn on reverse lights based on gear selection and turn on rock lights at low speed.
I put this together for testing. Package download is below (At Very BOTTOM). You will need to homebrew a non-standard ngspice (doesn't have ngspice lib by default). Its avail here https://raw.githubusercontent.com/jmaibaum/homebrew-core/8ac02ae933c4cd5d1f661b6a2bda2f429d5f1e87/Formula/ngspice.rb . Note the NGSpice homebrew is in flux and this version is done jmaibaum.
Just a quick video of what's next in Ham radio and some projects I've been working on, as well as others, to get there. Some highlights:
- MultiCodec - Codec2, AMBE...
- Remote Standardized Head Unit / Retrofit
- Less PC .. More Embedded
- More modular
- Easier to use and the possibility of installing station away from Radio.
- DSP development in the hands of more people.
- Older Designs get updates.
- Powerful Tools getting more accessible
- KiCad (New stable, RF Traces (Curved), Diff Pair Routing (USB, etc))
- Inexpensive STM32 and other DSP platforms
- Filter Creation and Simulation
An open source codec for compression is up and going (CODEC2).
AMBE is much easier to implement and get ahold of.
Remote heads are beginning to pop up commercially in the FlexRadio line.
More embedded projects/products including SM1000, FlexRadio head unit, and many many DStar node adaptors.
DMR radios have hit the market to warm up the digital voice market, many which are under $300 new.
I built my first combostar/picastar back in 2012. I've made several modifications over the past three years including adding a STM32 based embedded board to do FreeDV. Many of the parts were difficult to get and even more so now. I learned so much from its construction and the wealth of information from the homebrew group that I'd really like to see an update or maybe something entirely new. The DSP used is very old in the design, the TFT controller parts are dated some aren't made anymore. Here is the short list of reasons to update or come up with a new design for a homebrew HF rig.
- There are better parts for the GUI out. Integrated graphics STM32F4 would be a great upgrade. Maybe multiple screens and small OLEDs have come way down in price for adding addtional controls at low cost and ease of use.
- The DSP could be replaced with a STM32 series ARM keeping it all on the same platform.
- There are already improvements to the H Mode Mixer and maybe a direct conversion would possible now with some of the low cost TI frontends and low power/cost FPGA.
- Codec2 is widely availible and there is no reason not to include not only this digital mode but a hardware platform that may run future digital modes.
- Modularization of the GUI, RF sections etc. I really like the idea of mounting the radio somewhere and the GUI/MIC elsewhere. I would also like to see VHF/UHF modules that utilize all the work done on digital modes/GUI keeping the idea of a remote/even distributed GUI Head.