fischertechnik pneumatic mini air compressor

This is an enclosure for a cheap type of mini pump, making it compatible with the pneumatic program of the fischertechnik construction toy system. As the pump needs 3V as input, a small step-down converter is included in the design, so that the usual fischertechnik 9V (or anything between 6V and 23V) can be used.

In my tests, the pump provided up to ca. .7 bar at ca. 3.5V input. Due to its size it's quite slow, though, and not adequate for heavy-duty applications.

Apart from the enclosure you'll need:

1. Mini air pump e.g. from ebay. You can find them by searching for [Transparent Mini Air Pump](https://www.ebay.de/sch/i.html?_from=R40&_nkw=Transparent+Mini+Air+Pump&_sacat=0&_sop=15) and comparing the results with my pictures.
2. Step-down converter. Find this by searching for [Mini DC-DC Converter Step Down Module Adjustable](https://www.ebay.de/sch/i.html?LH_PrefLoc=2&_sop=15&_osacat=0&_odkw=Mini+DC-DC+Converter+Step+Down+Module+Adjustable%22&LH_BIN=1&_from=R40&_trksid=p23