adding a digital out

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Graeme
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#1 adding a digital out

Post by Graeme »

I have a technics slp1200 which i love.

It sounds pretty good, but thats no reason not to try and improve.

I had it open a while back, its pretty tightly packed inside!
Dont seem to be able to find a schematic yet though.
It has a little diagram on it that suggests it uses 2 dac chips and 2 output stages.
Ill open it again soon and investigate.

I am thinking of adding a digital out so i can try external dacs and maybe valve output stages.
How hard should it be, in theory, to add a digital out? Just a case of tapping off from the right legs of the dac chip?

Im a bit clueless with digital stuff.

I have thought of just replacing it but i really like the interface of this technics, easy to use, well layed out and very quick navigation so i think any future digital disc experimenting would be best if i use the 1200 as a transport at least.
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colin.hepburn
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#2

Post by colin.hepburn »

Hi Graeme
is this what your looking for if yes just register and you can download it
http://www.hifiengine.com/manuals/techn ... 1200.shtml
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Graeme
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#3

Post by Graeme »

Thanks, ill download it and see what it says.

A little general searching seems its not as simple as just tapping off before the dac chip, but im dont know, its all new terminology to me :lol:
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pre65
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#4

Post by pre65 »

Why not buy a cheap CD player at a car boot sale and practice on that first ?
The only thing necessary for the triumph of evil is for good men to do nothing.

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Graeme
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#5

Post by Graeme »

Yesterday i gave away a marantz cd63se :roll:

Practice is sensible, yes, but i tend to just dive in :lol:

Its a tactic thats worked so far (insert crossed fingers/touch wood smilie)
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colin.hepburn
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#6

Post by colin.hepburn »

I suppose you could download another CD schematic that has a digital out already and get an idea on the wiring take of points from that if it does come of the dac or not :)
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al newall
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#7

Post by al newall »

It's usually just a matter of finding the first component after the DAC output.
This is normally a resistor.
Take the signal from the resistor leg. This is easily reversible.
I wouldn't solder to the DAC pins unless there was no other option.
With some players you may have to isolate the existing output stage as well.
Much to learn there is.
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colin.hepburn
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#8

Post by colin.hepburn »

al newall wrote:It's usually just a matter of finding the first component after the DAC output.
This is normally a resistor.
Take the signal from the resistor leg. This is easily reversible.
I wouldn't solder to the DAC pins unless there was no other option.
With some players you may have to isolate the existing output stage as well.
Think Graeme is
Is think about adding a digital out al not to be confused with a buffer out I believe a valve buffer would come off the resistor from the dac but adding a digital out may be a bit more complicated i haven't yet seen anyone add a digital out to date :)
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Graeme
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#9

Post by Graeme »

Indeed.

I might ask the guys at work, if it looks too much ill just try adding a buffer stage, ive done that kind of thing before.

Dont want to hack it too much, want to keep it reversable, as its a nice cd player.
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al newall
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#10

Post by al newall »

Oh i beg your pardon. My mistake.
Yes of course, you need to find the digi signal before the dac.
The manual should help. No harm in trying.

If there is a receiver chip before the dac.....well thats a good place to start.
Of course its not always possible to do it.
I managed it on two players and i'm fairly clueless. :D
Much to learn there is.
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