A milliohm meter is a very handy piece of test equipment. Most hand-held multimeters cannot measure low resistances and bench meters that can, are usually quite expensive. [barbouri] has shared details of his milliohm meter build on his blog post, and it looks pretty nice.
Barbouri has updated his voltage reference board design:
This is my version 2 board update, which incorporates supply voltage regulation, over-current protection, and trimmer for the 5.000 volt reference all on the same board.
The new board uses a LM2937IMPX-10, which is a positive linear voltage regulator IC with a 10V output at 400mA in a SOT-223-4 package.
Barbouri has shared project the project on OSH Park:
What to do when a piece of test equipment is too expensive? Henrik Forstén decided to design and build his own:
Vector network analyzer (VNA) are used to measure scattering parameters of high frequency circuits
Since I can’t afford even a used VNA I decided to make one myself with a budget of 200€, tenth of what they cost used and about 1/100 of what they cost new
The design files and source code are available on GitHub: