ILER-DDS V2.1 VFO/DDS.
Page 5
Finding the right part:
IC’s
The board outline for ICs has a “U” notch on one end. This indicates the pin 1 end of the IC. There is
also a notch on one end of the sockets. This end goes over the “U” notch outline on the board. ICs have
usually pin 1 marked with a round dimple or dot. This end of IC will go towards the notch on the socket or
“U” on the outline.
Electrolytic capacitors:
These must be installed with the correct polarity. The positive (+) lead is always the long lead. The
negative (-) lead is marked by a stripe on the body of the capacitor can. Make sure the plus end of the
cap goes toward the hole labeled with the (+).
Transistors and diodes:
The transistors have the silhouette printed on the board. The diodes must be placed in the correct
polarity position, they have a color band on their body that must match the printed drawing on the board.
