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Since you may appreciate some "warm-up" soldering practice as well as a
chance to put some "landmarks" on the PC board, we'll first install some of the
larger components. Have a look at the Parts Layout Diagram to help with your
assembly.
We'll start with the larger PC board and work our way through that before
tackling the smaller front panel board. The first parts we'll install will be the IC
sockets, and there's a reason for that. If we install them first while there are
no other parts on the board you'll be able to lay the board flat on the ICs while
soldering and that will ensure that the parts are lying flat on the PC board.
Let's begin with the chips that don't use a socket, then the socketed parts.
1. Install U4, the 74HC595AN Serial to Parallel shift register. The part
has a notch or dot on one end and so does the PC board silkscreen for
that part. You can also see the notch on your Parts Layout Diagram. Align
the notch on the part as shown on the drawings. Be sure that all the pins
are through the board, that none are bent under or out, and make sure the
part is sitting flat before soldering all the leads. It's helpful to solder two of
the corner pins to hold the IC in place, check the placement, and then
solder the rest of the pins.
2. In the same way, install U1, the LMC6482AIN dual rail to rail opamp
chip. Line up the notch on the part with the notch shown on the PC board
silkscreen and Parts Layout Diagram. Be sure all 8 leads are through the
board and the part is flat before soldering them in.
3. Next we'll install the socket for U3. The socket has a notch similar to
the one on the PC board simply to make it easier to orient the part once
you're ready to install it in the socket. As with the ICs before, make sure
all pins are through and the part is flat before soldering. We'll install the
next part before placing the ICs into their sockets, again so that you can
rest the board on the part being soldered and get it set in the board
correctly.
4. Install the socket for U2. Orient the notch, place the part flush with
the surface and solder all the leads.
5. Take U3, the microcontroller IC marked with a sticker and place it in
the socket installed in step 3. You might want to gently roll the pins on one
side, then the other, to make the part slip into the holes more easily.
Remember to orient the notch as shown on the silkscreen and Layout
Diagram.
6. In the same way, place U2 in its socket. Check that all pins are in the
socket, not bent underneath or outside the holes.
7
Install S1, the DPDT power switch. Be sure it's flush to the PC board
before soldering all 6 pins.
8. Install D2, the 1N4000 series diode. This component has a polarity
BS2 • 11
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