1d. Solder the resistors onto
the stripboard: 1kΩ ( 18, 12
to 18, 16) and ( 25, 12 to 25, 16);
10kΩ ( 2, 12 to 2, 16), ( 9, 7 to
9, 14), ( 10, 3 to 10, 13), and
( 21, 3 to 21, 7); and 22kΩ ( 3, 12
to 7, 12).
1e. Solder in the 8-pin IC
socket with pin 1 at ( 12, 11)
and pin 8 at ( 15, 11).
1f. Solder in the 2 caps: 10nF
( 23, 12 to 23, 14) and 100nF
( 20, 14 to 20, 16).
1g. Solder in the voltage
regulator, pin 1 to ( 3, 5) and
pin 3 to ( 3, 3).
1d
1f
1h
1i
1h. Trim the LED leads to ½"
(14mm) to keep them long
enough to poke up through
the panel, but keep track
of which legs are positive
(anode, with the longer leg)
and which are negative
(cathode, marked by a flat
part in the plastic).
Solder one LED with its
(+) leg at ( 9, 3) and (–) leg at
( 9, 4), and the other with (+)
at ( 18, 3) and (–) at ( 18, 4).
1e
1i. The on/off toggle switch
legs are too wide to fit directly
into the PCB holes, so use
a 5" drill bit to extend the
holes into small slots at ( 14, 1),
( 14, 2), and ( 14, 3).
Fit and solder the switch
into place.
1g
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