JACQUES HIFI PAGES
UPDATES : Direct spdif stealing and laser adjusments on pioneer pd-s504
The stable platter : I had to try one. This model is not the top of the line, but still get a lot of goodies such as the great Legato Link dac , a JRC4558 as opamp output---I will never use it, but this particular opamp is legendary for guitar effect pedals...while perfect cheese for hifi--- and nice overall construction with optical spdif output. The digital out is clearly marked on the circuit---red circle--, so let's see what we get :
The infamous sharkteeh, we know
now from my preceeding spdif stealing page, is coming from a too big resistor
from digital out to spdif out.
So, like Mr.Lampizator, let's steal this mama
directly from the dsp chip :
This time a very good trace, and
a very good tone as a transport. I really love it . BUT, the laser starts behaving.
Nothing could correct it---caps, resistors network, cutting the opamps DC to
relieve the transformer---, and when I unplug the new spdif cinch, the laser is
happy again.
So this time I can be sure of one thing :
When
you steal direct SPDIF from a multi-purpose DSP chip
--most
of CD players have this, except some Philips with special PCF chip---
the laser will behave.
I really wonder why Mr.Lampizator never found out that simple fact....maybe he use only very good production CD and was lucky on the tracks...
From my experience, I had to rework the laser settings on every Cd player from which I stole spdif from its source. This Pioneer is no exception, and is quite tricky, as 3 controls are very tiny metal trimpots locating on the laser itself...
Another solution may be a bigger or separate power supply for the DSP, but I am still not sure if the misfunction of the laser comes from a bigger draw of current from the direct digital signal output. And I am not a great psu maker....to be continued...
MY PREAMP/BUFFER : MYKONOS AMPLIFIERS SPEAKERS CD PLAYERS DAC DRIVES / TRANSPORTS OSCILLOSCOPE TEST DRIVE TURNTABLES DCC PLAYERS