ML1 • 8
Now that all the ‘landmark’ components are installed, we’ll go about putting in
the smaller parts. These components are spaced close together on the PC
board, so pay close attention to the layout diagram so you install the right parts
the first time! Also, we’ll ask that you remember that install means to not only
install the part, but to solder it and trim the leads as well.
5. Install the three stand-up resistors, marked L1, L2, and L3 on the PC
board.
6. Install the three disc capacitors, C1, C2, and C3.
7. Install R1 the 15 ohm resistor. This component should be
installed as a stand-up resistor with the body of the resistor toward J1.
Be sure that no part of the component touches T1 as it may damage
the coil and come into contact with the AC line voltage.
8. Examine one of the SCR devices. Look closely and you will
see writing on one side. Install the SCR with the writing
facing toward the front of the ML1 (toward the
potentiometers). It is important that the SCRs are mounted
correctly. Install the three SCRs, D1, D2, and D3.
9. Install jumpers JMP1, JMP2, and JMP3. These are nothing
more than short scraps of component lead wire bent to fit
into the PC board holes and soldered into place. Their
function is to act as a ‘bridge’ over the circuit board traces
running underneath them.
This completes the assembly of the electronic component portion of your ML1.
Now is a good time to not only sit back and admire your work but to carefully
examine all solder joints and placement of the components. Be sure all excess
leads are trimmed away and touch up any solder joints that don’t appear
perfect. You may wish to brush the solder side of the PC board with a stiff brush
to make sure that no loose lead trimmings or solder drippings are lodged
between connections. It’s better for the ego to find an error now before power is
applied!
Final assembly
Final assembly is almost entirely determined by what sort of enclosure you have
selected to put your ML1 into. If you’ve selected small single AC outlets, a
plastic project from Radio Shack will do. If you decided to use a standard AC
wall style duplex outlet, then a larger box will have to be used. In either case,
you’ll see that the PC board has convenient corner mounting holes to hold your
board. You should mount the board near the front of your case since this will
allow the PC board mounted controls to stick through the front for easy
adjustment. Be cautious to ensure that no metal part of these controls can be
touched from the outside of your case. Remember that the circuit is connected
to one side of the AC line and could produce a nasty shock or worse to an
unsuspecting person. All this aside, let’s proceed:
(27 Seiten)
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