Oscillator installation
Install the 4MHz crystal in the
indicated position. The orientation of
the crystal is not critical. Solder the
crystal flush with the board and clip
off excess leads.
Install the four 10pF capacitors in the
indicated locations. Solder and clip
off excess leads.
Switching transistor installation
Locate the four 2N3906 transistors.
Notice that they have a flat side, and
that the component outline also has a
flat side. Install the transistors in the
indicated locations so their flat sides
face the same direction as the flat
sides of the component outlines.
Carefully press down on the transistors
until they are approximately 1⁄8-inch above the
top of the circuit board.
Tack solder the center lead of each transistor,
straighten the transistor, and solder the outer
two leads. Solder and clip off excess leads.
~1/8-inch
above top
of board
Crystal oscillator and loading capacitors
2N3906 switching transistor locations.