DMX-512 LED Controller with LED Display

Step 3 Transistors, Capacitors, and Optional Vreg

Transistors:

• The silkscreen image shows what direction the transistors go in, you may have to bend the middle lead outwards so it fits into the holes.

Capacitors:

• C1 and C3 are both 0.1uF capacitors, the small yellow ones. They can go in either way, not polarized
• C2 is a 1uF, the line down the side marks the negative lead, make sure that goes into the correct hole. The silkscreen shows the positon and a + and - sign. Or look at the 2 parallel lines inside the circles, the solid side indicates the negative.
• C4 value varies, 1uF to 220uF, it is polarized goes in the same way as C2.

Optional VREG: 7805 Linear Regulator, only needed if the input put voltage is more than 5v, otherwise its holes are jumped and the 7805 is not used.

• If source voltage is greater than 5v - The 7805's placement is indicated on the silkscreen layer, but it should be facing outwards like in the images.
• If the source voltage will be 5v, bend a piece of wire into a U shape, and use it to jump the 2 outer holes together, leave the middle hole alone.