Beeps when docking
station is connected.
Places iPod into Photo
Denison Ice Link Plus
Belkin auto adapter.
TABLE 1. Accessory Indicator.
turned all the way down. The audio in is
also at line level, and needs a preamp if
it is to be used with a microphone. A
simple preamp is shown in Figure 5. Pin
2 of the Dock Connector is signal return
ground for both the audio and video.
allelectronics.com). The modulator
converts the composite signal into an
RF signal on channel 3 or 4 for
display on the TV screen.
S-Video is an analog signal composed of luminance (intensity) and
chrominance (color) components.
The four-pin S-Video connector
(Figure 6) was designed for Super
VHS VCRs as a high-bandwidth video
connection, and has since been used
with TVs, DVD players, high-end video
cassette recorders, Digital TV
receivers, DVRs, and game consoles —
coming into greatest prominence with
the rise of the DVD format. Due to a
lack of bandwidth, though, S-Video is
not generally considered suitable for
high-definition (HD) displays.
The iPod Dock Connector has two
video outputs: composite and S-Video.
The composite video is the same as
that used for TV broadcast and displayed on an analog TV set. Almost all
modern video equipment has a composite connector, so there isn’t usually
a problem of simply plugging this
output directly into the video device.
However, older video equipment and
some very low-end modern televisions
have only an RF input (antenna) and
won’t accept the signal without an RF
modulator, like the CAT# MOD- 6 from
All Electronics (888-826-5432; www.
A resistor connected from this pin
to ground indicates which accessory is
connected. Table 1 is a short list of those
accessories that I know about. NV