The first part
of the electric control is mounting the switches. Here, again, I
had a stroke of good fortune. A local surplus-electronics vendor
had a sufficient quantity of computer-keyboard switches that fitted
my requirements: they were smooth-operating, had few moving parts
(like ONE -- two, if you count the spring); and would over-travel
after operating the switch. This last feature was important to me,
as I wanted the note to sound just before the key hit bottom.
Close-up of the keys showing the return-springs and the switches.
In another picture on this page, I show the switches wired to the
diode matrix board.
The switches are computer-keyboard magnetic reed switches. They
were cheap, and promised to be reliable, but, unfortunately, they
were just a little bit too wide to fit on the half-inch centers
of the keyboard.
So... I clamped
them in the mill ...
... and took
a little off both sides of each switch.
The switches were then glued in place in the switch rail.
it looks like with the switch rail in place. This photo taken during
the final assembly.
are wired to the diode matrix board (which is connected to the encoder
with a ribbon cable -- not pictured here)
maker of the board intended that I use CONNECTORS for the key switch
wires. Instead, I chose to solder the wires directly. Cable is laced
together with beeswaxed linen lacing twine.
keyboard diode matrix is wired to the encoder board with a ribbon
cable. For the magnets in the wind chests, I used a DB15 connector
and a standard computer VGA monitor cable. It took 2 for the big
windchest and one DB9 for each of the small windchests. The cables
were cut and terminated as shown in the right-hand photo above,
and put under the driver-board's screw terminals.
in the left-hand photo above. I had forgotten to cut a passageway
for the wires to get from the console to the base. The photos below
show me cutting that passage in the keyboard.
here is tipped on its back to show 1) the two air passages (with
the white insides); 2) the DB9 connectors to the small windchests,
and 3) the passageway discussed above.