DIY Diode Fan Controller - The Diobus

Part 3 - The Fan Controller Itself

I used these diodes, 1000 Volt, 1A. 0.10 BGN a piece. 14 of them - 2 BGN with the extras.

And this is the rotary switch, 6 positions. It is rather small, solid, can bear high currents - 3.50 BGN for one.

Some pictures of the diodes soldering, eplanations I think are not necessary:

Every diode has voltage dropdown of about 0.75 Volts. On the first two stepps I put double diodes (1.5V dropdown), the rest are single. So at the end the lowest voltage I get is about 7.25 V.