by building only the circuit and using shorter wires to connect smaller LEDs
to the outputs of the 4049 ICs. See
access. An ideal area is the side of a building with two windows 20 feet apart
at the top. A hallway wall of a college dormitory is also an excellent choice.
this measurement later when you build the holding frame.
schematics in
few ground return wires. The Shift Register board can be mounted up to 25
feet away from the PC via a long printer cable. You may be able to get longer
distances, but you will have to experiment.
boards.
the dimensions of 4" x 5", and one to dimensions
of 12" x 6". Take the first piece of perf board,
install the 18 16-pin IC sockets, and place them in
a manner similar to what is shown in
holes. The easiest way to do this is to gently bend
the two opposite corners of the socket to hold the
unsoldered socket in place, flip the circuit board
over, and solder these two corners before soldering
the rest of the pins. Add a 25-pin printer port con-
nector (P7) and a latching power connector (buy
a hard drive power extender cable and cut off the
connector end you will need).