- Single cap was not enough - the motor just started and did not pump air out. Two caps gives around 1s running time
- I tested the circuit with adjustable DC-power to see it works.
- The motor required 100uF cap to filter out noise. Without that cap the driver would stop the motor on multimeter reading 3.75. Led worked fine (turn off at 2.9V). After attaching the cap the motor worked fine.