Install R10

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		LED			shorter lead, flat side = negative lead
install R10					Leave these leads
we’d better	longer lead = positive				Leave these leads
			+	-	as short as possible
					as short as possible
install D3, the

					PC Board
mini red LED.					PC Board
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 Side view

bent over and the LED will be sitting on the board
when you’re finished. In other words, very short		front of PC board
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.

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.

SHA2 • 17

SHA2 specifications

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SHA2 • 17

SHA2 specifications