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PS...

Hi,

Here the most simple PCM56 DAC possible:

This is from here:

http://www.y-min.or.jp/~nob/Audio/DAC/DAC03.html

The Author first a version with a more complex arrangement to direct the correct signals to L/R but appears just like I did to have found the simplest arrangement the best.

The DAC uses the on-board Op-Amp's for I/V etc, I would probably change this to passive I/V. Here a "hacked up" schematic that shows how to use the passive I/V:

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The PCM56 is fully charaterised to use 1K I/V resistors, which means my original TDA1543 I/V with "anti sinc" filter will drop right in, in place of the two resistors to ground shown in the schematic:

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Output would then be 0.7V RMS, this can be just enough to drive a preamp/integrated. Otherwise an Analog stage with a little gain would be desirable, around 3 times would be good.

Sounds to me like a pair of 2A3's (or 45's or 71A's) would be an interesting twist, run with a suitable Anode load choke 50H+/20mA and with a 250V HT and a 2k2 Cathode resistor, capacitor coupling to output. Anyway, many ways of skinning that particular cat.

Also here an example of a matrix Board circuit to which a copper groundplane was added using self adheasive copper tape:

Ciao T

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