Here my first update:

Got the analog part up and running. Read More...

How often do I debug electronic circuits and have a lot of SMD components lying on my table. To avoid mixing up wrong values I usually throw them away.

Sometimes it would be handy to measure the values of SMD components.

Already quite some time ago I found a Read More...

I have a selfbuilt ventilation system in my house, including a selfmade heat exchanger.

Of course I'm interesting to measure efficiency of the system, so I added temperature and humidity sensors to it and even realized a function that it only ventilates when the outside humidity is low enough to avoid condensation at cool walls.

But are the in- and outlet ventilators running at the same flowrate?
How big is the pressure drop of the piping and the corresponding reduced flowrate? Read More...

I read in a book about an effect called "dielectric absorption".
Basically it is an effect that each capacitor has. Depending on the dielectricum it is larger or smaller.

When a capacitor is discharged the capacitor charges up again after removing the shortcut between the 2 terminals.

Of course I had to test it myself :-)

My test setup:

Read More...