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Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

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Old 16th April 2004, 06:53 PM   #1
Bernhard is offline Bernhard  Germany
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A Philips CDD 461 CD rom, this is a kind of cd player for PC with audio out and data I/O.

DAC is TDA1543. Transport is CDM4.

It sounds like a tape recorder copy of a tape recording of a record.

Low & compressed dynamics, rich harmonics, very nice for electric guitars, I always liked that 20 years ago

I do not believe the TDA is faulty...

Now see what you hear :
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Old 16th April 2004, 06:59 PM   #2
Bernhard is offline Bernhard  Germany
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Talking Anybody mentioned that channels sound different ?

K3 left -46,7dB, right - 39,3dB.

Very strong noise floor.

Left channel: Strong harmonic @ 21 kHz -25dB

Right channel: Strong odd order harmonics up to 45kHz.

The worst I have ever seen so far.

Stacking could help a lot
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Old 16th April 2004, 07:29 PM   #3
jean-paul is offline jean-paul  Netherlands
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CDROM ! Sound was a feature then, quality was not important. Only 5V and 12V supplies for servos, spindle motor and everything ? Switched PS ? It seems TDA1543 is your worst enemy as you seem to want to prove it's our worst nightmare.

I wonder when you will hook up your analyzer to your fridge with TDAxxxx chip in it.
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Old 16th April 2004, 07:43 PM   #4
Bernhard is offline Bernhard  Germany
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Double layer pcb with ground plane, I see two regulators, transformer like in every other Philips.
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Old 16th April 2004, 07:45 PM   #5
jean-paul is offline jean-paul  Netherlands
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Every other Philips has more than 2 regulators and several secondary windings on the transformers for symmetric ( +/- ) supplies. Besides that cdplayers are specifically designed for audio, cdrom players aren't.
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