philips cd player 723

[sigurd]

Hello,

there is a mistake in the schematic philips cd player 723 :

R3506 = 15K must be 10K
R3507 = 10K must be 15K

this is important for optimal sound....

see : datasheet TDA1545A : I BL = 1 mA
I BR = 1 mA

Vref 3,3 volt = 2/3 Vdd
Iref 1mA x 2 = 2mA so R3506 10K
so R3507 15K

now the bass and the treble is OK.

 

[sigurd]

Philips cd player 723

Modification on CD player philips 723 :

R 3511 : 3K9
R 3538 : 3K9
C 2509 : 1nF
C 2510 : 1nF
R 3513 : 100K
R 3514 : 100K
R 3541 : 68 Ohm
R 3542 : 68Ohm
C 2513 and C 2514 remove
R 3507 : 33K
R 3506 : 22K I solder him on the +VDD (not on the 5,6 volt)

all caps 220µF BG st

C VDD not 22nF but 100 nF PIO TDA1545A 🙂
C Vref : !!! 220µFBG with 47µF elna silmic II with 100nF PIO
all parallell
R3538 : 390 Ohm for LM2132 ( + and - same voltage )

Now it sounds very analog , but do all the changes🙂

 

[sigurd]

Philips cd player 723

R 3512 : 3k9