I never forgot the project of Ryohei Kusunok seen on MJ magazine many years ago about a simple DAC using four Philips TD1543.

Here is presented a very similar design and it is very easy and cheap to create using a DIY kit get from http://us.hifidiy.net/ at a very low price:

• Extreme TDA1543 $88.00
• Chassis for Extreme TDA1543 $55.00 (All aluminum chassis)
• 2 x Caddock MK132 500ohm
• 2 x 22nF (in parallel to the Caddock to create a high frequency filter)
• 2 x 100uF 10V Sanyo OS-CON (to skip DC components on output)
• 4 x 100Kohm 1% (to insert in 2 x parallel on outputs)
• 1 x power supply transformer 2 x 12V 1A

This design use the CS8414 as digital input receivera and 4 pcs of TDA1543 in parallel.

The output stage with 2 x OPA604 is not used and the resampler rate as been disabled to get the best sound.

The complete schematic for this DAC can be download here and in this is very easy to understand that the output signal quality depend on the 500 ohm resistor on the DAC chip output with the function of I/V (current to voltage) converter.

• schematic part 1
• schematic part 2
• schematic part 3
• complete board

Follows a measurement set of the signal before of any output stage get by Clio system on output to the DAC chips and driving the input signal with the SPDIF output of the USB audio interface Audiophile USB by M-Audio.

In all these measurement I see a perfect and linear distortion spectrum decay and very low distortion level.

LEFT

RIGHT

MLS

BAD RESULT WITH RESAMPLER INSERTED