Vectronics VEC-1500K - Manual (Page 40)

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Before soldering a transistor in place, be sure to check specific installation
instructions or consult a technical data sheets for that device.
Integrated Circuits
Integrated circuits, or ICs, contain many active and passive devices (transistors,
diodes, capacitors, resistors, etc.) which are connected together to perform a
specialized task. These devices have a minimum of eight leads. Proper IC
positioning is indicated by a dot or square marking located on one end of the
device. A corresponding mark will be silk-screened on the PC board and printed
on the kit's parts-placement diagram. To identify specific IC pin numbers for
testing purposes, see the diagram below. Pin numbers always start at the keyed
end of the case and progress counter-clock around the device, as shown:
1 2 3 4
8 7 6 5
Installation
Key
Key
Installation
Pin Numbers