1f. Install the 9V battery clip and
mark a plus sign for the red wire and
a minus sign for the black wire.
1g. Install the 10 resistor and the
0.047µF capacitor. Take advantage
of the “proto rows” to make the
• Chip pin 5 to one leg of the 10
• The other leg of the 10 resistor
to one leg of the 0.047µF capacitor.
• The other leg of the 0.047µF capacitor to “ground.”
For our purposes “ground,” which is
shown on the schematic as a triangle
with the point down, is the long “proto
row” we marked with a minus sign.
1h. Use this same technique to install
and make connections.
1i. Solder the wires to the phone
jack. Use green for signal and black
1j. Install the wired phone jack to
the circuit. You should end up with
something that looks like the photo
to the far right here.
1k. Cut the red lead and install
TIP: Every time you
install a part or make a
connection, mark it off
on the schematic (“Little
Gem” schematic courtesy