A little update Following the past months’ trend I am not posting as often as I wish I could, but the project is alive and well. One of the key functionality I want my ESP32 based project to have is sound. More specifically, I would like it to be a […]
It’s been a month since the last update. Check out the previous post for the complete history of this project! Being a hobbyist sometimes mean you don’t have as much time to sink in your projects as you would like to, but you have to live with it. Nonetheless, there […]
I have been talking about VFDs for a long time now, mainly how to power them. I now have my PCBs for 12 IV-25 tubes ready and soldered! The big display You have to imagine this panel upright, 6 of them side by side. That will give a total area […]
Today we are reviewing the PCBs made by JLCPCB. JLCPCB is one of the bigger Shenzhen based PCB manufacturers out there. Although questionable, they claim to get over 8000 orders per day. More recently they got a lot of community support by partnering up with EasyEDA; but they also made […]
The H-Bridge I built was originally too slow. I perfected it using smaller pull up/down resistors and tuning the transistor choice further, and it’s now giving very good performances. On this matter I highly recommend the Art of Electronics’ chapter on bipolar transistors under “2.2.2 Switching circuit examples” which explains […]
My next project will probably feature an ESP32 and I would like to be able to re-flash it with a new firmware even when it is firmly soldered on its PCB. As as a result, I looked for USB interfaces chips and although the official ESP32 devkit uses a CP2102, […]
In my previous series about VFD filament driver, I built a power supply based on a few operational amplifiers and a transistors. I actually implemented this design in a fully fledged PCB: However, the method used is not perfect. I can still see some biasing issues proper to the […]
I am currently designing a big VFD tube IoT thing and when creating the PCB I sent the gerber files to OshPark. They quoted back about US$180. Ouch. OshPark pricing completely breaks down once you start marking a board 4 inches / 10 cm long or above. So to China […]
Lately I have been playing a lot with the amazing esp32. It is an amazing “microcontroller” for makers, and I add quotes to “microcontroller” because really, it’s an IoT do-it-all SoC; all for the low price of about US$5. One of the main features of the esp32 is its ability […]
