Philips PM2517E Service Manual page 59

54
3.4.6. OO 0061 AC to DC convertol
3.4.6-l - General
The OO 0061 is an integrated AC to DC convertor and consists of three main parts viz: a voltage to current
convertor with two selectable input ranges, a current rectifier with an autozero compensation circuit and a
logarithmic-antilogarithmic
calculating RMS convertor.
0 0 0 0 6 1
R b
R b
G N D V
V i n 2
S o
5 i n
( . 8 5 v )
O U T
C r m s
P R O T
R o
( - 8 s v )
AZ.
F i s . 3 6 .
R o R b
s T 2 4 8 6
vss GNo Vdd
- 8 . 5 V
+ 8 . 5 V