Solar rainbow discoball!

Step 2 Build the solar engine circuit

Now have a look at the board. You can see there are markings for different components to be soldered in. Sometimes you'll need to bend the legs of the components to fit in the holes, and sometimes you'll need to make sure the component goes in the right way round! Let's start with C1:

C1: We have to solder the capacitor the right way round. It will have a stripe with - signs on it. This is the negative side. The board is marked with a +, so make sure the + of the capacitor connects to the + on the board. Check the photo for help.
 

D1 and D2: Diodes matter which way round they go too! The stripe on the board corresponds to the stripe on the diode.

T1 and T2:  Make sure you use the 2n3904 for T1 and the 2n3906 for T2. Put them in so that the outline on the board matches the shape of the component.

 

R1: 2k resistor, this doesn't matter which way round it goes. 

We'll solder on the solar panel and the motor later.