46
WhitakerAudio
3.2
Transistorized Stereo Preamplifier Module
The preamplifier PWB is mounted along the side of the chassis adjacent to the left channel
amplifier board (amplifier board #2). This location places the sensitive input circuits as far away
as possible from noise sources. The preamplifier PWB is a four-layer device with the outer layers
assigned to signal-carrying traces and the inner two layers assigned to ground and V+. This makes
for a very efficient layout and maximizes hum and noise suppression on the board.
The connection point codes are detailed in Table 3.5.
Table 3.5
Transistorized Preamplifier PWB Connection Wiring Codes
PWB Code
Function
Connection Color Code Notes
GND
Ground
Black
Connected to main ground
point
40Vdc
DC power input
Yellow
40 V dc maximum voltage
input. Connects to V+ source
on power management PWB.
GND
Ground
Black
Ground connection to pream-
plifier daughter board
V+
24 V dc bus
Yellow
V+ connection to preamplifier
daughter board
CONN100
Phono input, right
White
Pin 1
GND
Shield
Pin 2
CONN101
Phono input, left
White
Pin 3
GND
Shield
Pin 4
CONN102
Phono out, right
White
Pin 1
Phono out, left
White
Pin 2
GND
Shield
Pin 3
GND
Shield
Pin 4
CONN103
Tone control input, right
White
Pin 1
Tone control inputl left
White
Pin 2
GND
Shield
Pin 3
GND
Shield
Pin 4
Содержание JC Whitaker 20 W Stereo Integrated Audio Amplifier
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Страница 20: ...20 WhitakerAudio Figure 1 3 Power management circuit for the 20 W integrated stereo amplifier ...
Страница 38: ...38 WhitakerAudio Figure 3 1 Component layout for the Amplifier PWB 1 right board ...
Страница 40: ...40 WhitakerAudio Figure 3 2 Rectifier PWB component layout ...
Страница 43: ...43 20 W Stereo Integrated Audio Amplifier Figure 3 3 Component layout for the Amplifier PWB 2 left board ...
Страница 45: ...45 20 W Stereo Integrated Audio Amplifier Figure 3 4 Layout of the speaker terminal PWB ...
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