Philco STC-9630 - Explanation of Key Components; Volume Control IC PT2258

10
THE EXPLANATION FOR KEY COMPONENTS
1N1
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
VCC
REF
1N2
10dB/Step
10dB/Step
1dB/Step
1dB/Step
Ref
1N3
1N4
10dB/Step
10dB/Step
1dB/Step
1dB/Step
Ref
1N5
1N6
CODE1
CODE2
DGND SDA SCL GND
10dB/Step
10dB/Step
1dB/Step
1dB/Step
Ref
Ref
Control unit
VOLUME CONTROL IC PT2258
Manufactured by CMOS technology,6-channel volume control IC.I2 C control interface
Features:
6-channel design, each channel 0-79 dB 1dB/STEP
Working voltage:+5~8v
Audio channel separability: 100dB
2
I C control interface
DIP package
STC-9630 SERVICE MANUAL