Archive for the ‘DAC’ Category

Yamaha DA202 DA Converter

Thursday, September 11th, 2008

Update on Nov 12, 2009:

FFT measurement:

DA202 FFT 16 vs 20bit 44.1kHz

DA202 FFT 16bit -10dbFS

DA202 FFT 16 vs 18bit -80dbFS

 So you can see the noise floor is not great at about -110dbV.

Last update on Sep 11, 2008:

This is a professional DAC made by Yamaha back in 1988.  It was made for the DMP7D digital mixer in the same period using PCM56P-K x 2 and IC op-amps JRC 2068 and NE5532.  Yamaha use a custom IC YM3023 to switch the 16bit DAC into 18bit. The digital receiver chip is Yamaha YM3623B.  The power supply is a linear regulator.

DA202 Spec

Yamaha DA2X DA Converter

Friday, August 15th, 2008

Update on Nov 12, 2009:

FFT measurement:

DA2X FFT 16_20bit 0dbFS

DA2X FFT 20bit 0dbFS Log

DA2X FFT 20bit -80dbFS Log

From the meausrement, you can see this is a very good DAC and the distortion as well as noise floor is very low!

Last update on Aug 15, 2008:

This DAC has all the good design inside.  I believe Yamaha try to build one of the best sound DAC at the time back in 1990.  This DAC give you the life in music but I feel the “Sss” sound is a bit over drive in high frequency.  It use Sanya OS-con as the op-amp power supply decouple and I am not too sure if the high frequency glare is due to that!  For the op-amp, I think Ti NE5532 may sound better as Yamaha switch to this brand after this model.

  1. SPDIF/AES input using YM3436
  2. Second PLL using Fujisu VCXO
  3. Yamaha YSF210B digital filter and sample converter
  4. Philips SAA7350 x 2 pcs 1 bit converter
  5. Philips TDA1547 x 2 pcs 1 bit DAC chips
  6. Op-amp filters and buffer – JRC2114, JRC5532
  7. Nichicon, Elna, Sanyo OS-con, Soshin, Panasonic Electrolytic or film capacitors
  8. RMA or Film resistors for signal path
  9. Linear power supply and regulators

DA2X Specifications

Wedia D/A Converter

Tuesday, July 22nd, 2008

This is a low end Wedia DAC using CS8412, DF1700P, 2x AD1864 and OPA606.  There is a custom chips in between the DF1700 and DAC chips.  This DAC sound better than most TDA1541 but not as good as PCM63 DAC.

PCM1798 ezDAC + Jfet IV + DIR9001

Tuesday, March 25th, 2008

This is a ezDAC pcb with two modifications: Use DIR9001 to replace CS8416 digital receiver and Jfet IV instead of op-amp IV.  This is a good DAC but the sonic lack of some musical taste.  It is a matter of preference but overall sound stage and 3D is good.

PCM1798 ezDAC circuit

PCM1702 to PCM63 Converter BD

Sunday, February 10th, 2008

This board is designed to use PCM1702 DAC chip (smd type) to replace PCM63 in D1V3.  There is one fault on the pad size of SOIC for PCM1702 (too wide).  Thus soldering of the DAC chip is quite difficult but the board is still able to be used.

Circuit