This post will be a small update on the generator’s project. As I have received the PCBs the next logical step is to solder one PCB and test it out. So, I did exactly that. I thought that the best way to start soldering everything would be from power circuits – if they work correctly, … Read more
So, I have received the PCBs which were designed for the DIY portable signal generator. This post will be more about the PCBs and its manufacturing tutorial than a regular update on the project. So, it might be useful for those who wants to get their own PCBs manufactured, but don’t know how to do … Read more
Finally, I have managed to design a PCB for my DIY generator based on an AD9833 with additional analog circuity and controlled by an ESP32 MCU with a touchscreen-based user interface. Because everything that I have used in this design were more or less mentioned in the earlier posts, this one will be a short … Read more
Finally, a bit of a progress with the generator. This post will be about some experiences with the LCD, eSPI library and touch. Links to project’s all posts VCA822 Gain Amplifier Circuit LM7171 Offset Circuit Gain and Offset Control Filter Circuit Dual 5V Power Supply Dual 12V TPS65131 Power Supply Battery Charging Circuit with BQ24295 … Read more
After a long wait, I finally have received a 3.5-inch LCD Display with a capacitive touch panel. The LCD with a touch interface is probably the last thing which needs to be done before whole generator’s project could be brought to the last phase of designing and building a finished tool. Links to project’s all … Read more
After the first part with the OrangePi Zero, there are two things left to do: add some buttons, so it will be possible to reset or power down the device without going to the OctoPrint’s WEB UI and make some kind of casing, so it won’t be just a bare board lying on a desk. … Read more
I have started modifying my own 3D printer and one of the mods is a WEB interface. To have the WEB interface, the printer is connected to its own WEB server which has Octoprint running on a small OrangePi Zero Linux computer. Octoprint is an open-source project which is intended to allow 3D printing without … Read more
Let’s continue building a signal generator and take another step by making a basic web interface. In this context ‘basic’ means a starting point from which interface could be made more advanced with added features, logic, design elements etc. Note, I started talking about WEB interface, which means that I have almost decided on an … Read more
Yet another step towards DIY signal generator’s design finish line. This time it is a battery charging circuit based on a Texas Instruments BQ24295 chip. In previous parts I have mentioned that the generator needs to be powered from a battery. So, this circuit is going to be the one responsible for making it possible. … Read more
Today’s continuation of a DIY signal generator based on an AD9833 is going to be about a dual rail 12V power supply based on TPS65131 IC. In the previous part I have talked about a 5V dual power supply used to power the variable gain amplifier and other circuity. This dual 12V PSU will be … Read more
