I have written about STM32F105RB and why I chose this before. Sample prices on AliExpress do variate, but I noticed some batches of STM32F105RC for 1.8 USD each so I purchased 10 of them – they arrived today and I will stick one of them on a breakout board later. ST’s own price for this…
Just checked my blog statistics. Last year was an average of 112 lookups per day at 1min ++. Last month was 192 per day at an average of 2 min per reader. Thanks for reading!
This aluminium box cost ca 16.- USD P&P included and is accidentally the correct size to mount 2 of my backbone PCB’s on the inside. I need to do a more exact scaling, but the concept is illustrated below. To do this I need to make some PCB Holders. The ones illustrated below should be…
Starting at left with 230VAC input we need a classic rectifier and filter that will produce high voltage DC out. This is input to a PWM driver that will use HEXFET’s to generate a MCU controlled PWM into the isolation transformer. The duty of the PWM decides the output voltage. If we have 400VDC and…
I ordered a DPS5020 (50v/20A) Lab PSU for 45.- USD with USB connector. I intend to hack that serial port and extend the HMI with my own interface, but my primary challenge is finding an affordable AC/DC that will deliver 60V/20A as input. I did find some interesting alternatives: This is 36V/5A and well suited…
The next module I want to make is the Servo Module. This is handy since the 16 channels also can be used as digital/analogue IO signals. I will use 16 x 3xRight Angle Headers and some jumpers to select between voltage. I will only support 5V & 12V and max 10A in total. Higher voltage…
The black “dot” in the midle With wires is a 15uH/1A coil. I cut the 5V to ADM2582E on the backside and re-inserted 5V through this coil – now it ticks perfectly. If I short the coil it stops. I still need to add bypass capacitors, but this is a reminder how important these coils…
DPS5015(0-50V/0-15A) and DPS5020(0-50V/0-20A) are DIY modules available for ca 40.- USD. It exist several of these. Notice that input here is 60V DC, so you need a AC/DC converter in front of this. I have looked at these for a while as I plan to build some Lab PSU’s. It is an interesting option. The…
I need to see if I can prevent the ADM2582E from creating noise so I can run the MCU at 168Mhz with this precent. This is my current PCB around the ADM2582E. I only use 2 layers and could have needed 4 here, but the main problem is that I dropped the bypass capacitors on…
Mounted a STM32F405RG from a new batch I have and it works perfectly at 168Mhz. It just hit me that the other board have a ADM2582E mounted so I removed that and that board/MCU suddenly works at 168Mhz as well. It’s no question, I moved the ADM2582E to the New board and the board suddenly…