I generated several libraries for Altium (or Circuit Studio) using Database Libraries which I then exported to IntLibs. I realize you can get many of these parts from Altium or other third parties. I wanted to figure out on my own how I could scrape data from Digi-Key and (almost) automatically create part libraries. Altium […]
I was looking for a way of reading a PT100 temperature sensor with a Raspberry Pi. I couldn’t find an inexpensive way of accomplishing this on a hobbyist budget. And to be honest I like to build things so this was how I did it. Amazon and eBay are full of things like this now. […]
The MMBT5179 is a cheap NPN bipolar junction transistor designed for radio frequency applications. I designed this super simple 1″ square board to test the performance of this transistor. I personally intend to use this part in the HF range from 10 – 30 MHz. Due to this being a two layer board I was […]
Uses AD8307 logarithmic amplifier, coupled to MCP3550 22-bit A/D converter. This will be used as part of the level control/feedback in an RF synthesizer.
Recently at work I was tasked with determining the frequency modulation of a laser beam. I designed and tested the above circuit in a couple hours. I tested the circuit first with no photodiode in place using my DG8SAQ vector network analyzer — a very low cost network analyzer based on the highly respected (by […]
I’m writing a Linux device driver for the PCI/PCIe cards 5i25 and 6i25 available from MESA electronics I’ve never written a device driver before. Currently my driver does nothing except enable the PCI device, map the BAR0 to system address space, and check the “magic value” available in BAR0 + 0x100. It then prints out […]
So you’re on Windows and want to use Dropbox or Google Drive with it’s own drive letter? Step 1: First figure out where your Dropbox or Google Drive folder is stored. Go to ‘Computer’ and right click on Dropbox or Google Drive and copy the whole path name that is in the text field labeled […]