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6. CIRCUIT DESCRIPTIONS
I n p u t
Lêvel Conlrol
Level Meler
L I N E
0uT
REC/P8
H e o d
5 2 : R E C / P 8 S E L E C Î O R P B _ R E C
S C : I N P U T
L I N E - M I C
F i g . 9 B l o c k d i a g r a m
The circuit construction of the set is shown in
the block diagram, and the circuit schematic is
shown on page 41.
6 . 1 R E C O R D I N G A N D P L A Y B A C K C I R C U I T S
The special tape deck system IC (PA4001)
developed by Pioneer is used in the recoridng and
playback circuits. The PA4001 is a 16-pin dual-in-
line IC containing a microphone amp, recording
amp, and headphone amp. Its block diagram is
shown in Fig. 10.
Flat amp 1
The flat amp section of PA4001 is used. This
amp ha.s a flat frequency response, and boosts
the equalizer amp output at playback and the
microphone output or LINE input signal at record.
Flat amp 2 (Qcotl
This amp has a flat frequency response, and
amplifies the output of the Dolby processor.
Headphone amp
The headphone amp section of the PA4001 is
used. This amp is a headphone and level meter
drive complementary amp, and has a gain of ap-
proximately
7.5d8. The headphone output is
divided bV resistors.
,,
rN
our
I N
O U T
I N
Fig. 10 Block diagram of P44001
F l o t
Anp 2
OUT
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