CHAPTER 23 ■ THE MOTHERBOARDNotice the notch on one side of the DIP (dual inline package) socket. This corresponds to the notch in
the chip to indicate the direction in which the chip should be aligned. Table 23-1 lists suppliers of 8-pin DIP
IC sockets.
Table 23-1. Suppliers of 8-Pin DIP IC Sockets
Supplier Part Number Price Description
Jameco 51571 $1.30 Quantity 10, Dual Wipe
Jameco 112206 $2.50 Quantity 10, Dual Wipe
Electronix Express 19ICL08 $0.10 Low Profile
Digi-Key 3M5473 $0.36 Dual Wipe
Solarbotics DC-8 Pin $0.25 Dual Wipe
Jameco 105620 $6.95 100 Assorted (may or may not have 8-pin)
Jameco 135386 $14.95 1-Pound Grab Bag Assorted (may or may not
have 8-pin)
Figure 23-7. Adhesive being applied to edges of Molex connnector
Keeping the Components on the Board During Soldering
After all the work you’ve invested in carefully laying out the components on the breadboard, you don’t want
the parts spilling out when you turn the board upside down for soldering. Here are a couple of common
techniques to prevent that.
Gluing the Molex KK Headers to the Circuit Board
The pins of Molex KK headers are slightly loose in the holes of standard breadboards. When the board is
turned over for soldering, the Molex headers slip out slightly or even fall out completely. (This won’t occur
with appropriately sized holes of custom PCBs.) It is very important that the headers are soldered completely
flat against the board, otherwise they may wiggle or rip out when attempting to make a connection to the
housing.
- With a disposable toothpick, apply a bit of adhesive to the edges (not the metal
leads) of the Molex headers (see Figure 23-7). This will keep them fully seated on
the board during soldering.