Ramsey Electronics SHA2 - Manual (Page 17)

SHA2 • 17
stories about DPDT switches to bore you with.
Back to jacks, install J2 and while you’re at it, let’s install J1 and get it over
with. Both are 3.5mm stereo jacks.
Now install J5, the 2.1mm power jack.
Time to install the 9V battery holder. This is where you’ll need that clipped
off lead from the beginning of your construction. This is bent into the
shape of a staple that will fit through the holes in the battery holder and
down through the top of the circuit board. Once the holder is on the board
with the “staple” through it, bend the leads out on the backside of the
board to hold them in place, then solder. The tighter the bend the less
slop you’ll have in the battery holder. If you want it perfectly tight then get
it where you want it and solder the “staple” wire right to the battery clip on
the topside of the board.
We still have to flip the board over a few more times so let’s install the battery
snap last; that way it won’t flop around too much.
Install R9, the 100k ohm PC mount switch potentiometer. It’s different
from the other three and easy to spot.
Before we
install R10
we’d better
install D3, the
mini red LED.
The part has a flat side and a flat edge is shown
on the PC board for orientation. This part will be
bent over and the LED will be sitting on the board
when you’re finished. In other words, very short
lead length above the board.
Install R10, R11, and R12, 100k ohm PC mount potentiometers. These
parts will want to sit flat on the board before you solder them. They like it
that way.
PC Board
LED
Leave these leads
as short as possible
- +
shorter lead, flat side = negative lead
longer lead = positive
Side view
front of PC board
I like to solder the 3 center leads on the pots, then take my time and
solder all the ground connections on each one. The ground connections
will take a bit more time because the surface area of the ground plane
is larger than the small pads you’re used to. But don’t worry, you won’t
hurt anything leaving the iron on a bit longer with these connections. In fact,
you'll have to do it that way to get a solid solder joint. And soldering all the
grounds together will actually make it easier since the plane will stay hotter as
you keep working from one connection to another.