WhitakerAudio J C Whitaker 20 W Stereo Audio Amplifier, Manual

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79
20 W Stereo Audio Amplifier
– Install R208 – 1 k
Ω
, 0.5 W . Solder in place.
– Install R209 – 2 m
Ω
, PC-mount potentiometer . Solder in place. Set the device for center
position.
– Install R210 – 150
Ω
, 2 W . Solder in place, leaving about 1/4-inch spacing above the
board.
– Install R211 – 15 k
Ω
, 0.5 W . Solder in place.
– Install R213 – 470
Ω
, 0.5 W . Solder in place.
– Install R214, R215 – 120 k
Ω
, 0.5 W . Solder in place.
– Install R216 – 10
Ω
, 2 W . Solder in place, leaving about 1/4-inch spacing above the board.
– Install R217 – 180 k
Ω
, 0.5 W . Solder in place.
Clean the soldering iron tip.
– Install C201 – 220 µF, 25 V electrolytic . Solder in place, observing proper polarity. Note
that the positive terminal is denoted by the square mounting pad.
– Install C202 – 1000 pF, 100 V . Solder in place.
– Install C203 – 0.047 µF, 100 V . Solder in place.
– Install C204, C205 – 1,000 µF, 50 V, electrolytic . Solder in place, observing proper
polarity.
– Install C206 – 0.01 µF disc, 1 kV . Solder in place.
– Install C207 – 500 µF, 25 V electrolytic . Solder in place, observing proper polarity.
Note that D201 and the other semiconductors installed in the steps that follow are sensitive to
static discharge. Take appropriate measures to minimize the possibility of component damage due
to static electricity. Note that the electrostatic protection packaging may not be recyclable.
– Install D201 – 100 V switching diode . Solder in place, observing proper polarity. Note
that the anode terminal is denoted by the square mounting pad. This convention is used for
all diodes.