sachi
Active Member
Hi guys,
I am undertaking a few mods to my DIY DAC which is based on the PCM 1704.
1> I have just ordered parts for a JFET I/V stage to replace the OPA627BPs... The JFET board also comes with a discrete regulator power supply section for the I/V stage which will replace the 7812 and 7912 already on duty. This JFET stage is basically a clone of the I/V stage on the Pass Labs D1 DAC.
Further upgrades that I am looking to make are to the clock, its power supply and the supply to the DACs itself.
2> Currently the power supply to the clock and the receiver chip is being fed through a single archaic 7805. I want to make the power supplies separate as a starting point.
3> Next step up would be to replace the Seiko clock module with a tentlabs XO.
4> I am also going to be replacing the 7805, 7912 and 7812 (which also supply the +/- 12V to the LM317, LM337 adjustable regulators used to derive the +/-5V supply to the DACs ) with a high quality shunt regulator.
5> One final upgrade that I am currently thinking about is having another input to feed I2S signal directly into the DAC. BUt there a alot of logistics i need to work out for this mod before I know it can be made possible. Mainly to do with the input switching from a SPDIF signal to an I2S input and back.
I am expecting huge improvements with some upgrades and smaller ones with a couple others.
I however wanted some first hand input on the tentlabs clock upgrades?
Would appreciate if anyone can shed more light on this.
How big was the difference if at all you did use any of his clock products in your gear?
Thanks,
Saachi
I am undertaking a few mods to my DIY DAC which is based on the PCM 1704.
1> I have just ordered parts for a JFET I/V stage to replace the OPA627BPs... The JFET board also comes with a discrete regulator power supply section for the I/V stage which will replace the 7812 and 7912 already on duty. This JFET stage is basically a clone of the I/V stage on the Pass Labs D1 DAC.
Further upgrades that I am looking to make are to the clock, its power supply and the supply to the DACs itself.
2> Currently the power supply to the clock and the receiver chip is being fed through a single archaic 7805. I want to make the power supplies separate as a starting point.
3> Next step up would be to replace the Seiko clock module with a tentlabs XO.
4> I am also going to be replacing the 7805, 7912 and 7812 (which also supply the +/- 12V to the LM317, LM337 adjustable regulators used to derive the +/-5V supply to the DACs ) with a high quality shunt regulator.
5> One final upgrade that I am currently thinking about is having another input to feed I2S signal directly into the DAC. BUt there a alot of logistics i need to work out for this mod before I know it can be made possible. Mainly to do with the input switching from a SPDIF signal to an I2S input and back.
I am expecting huge improvements with some upgrades and smaller ones with a couple others.
I however wanted some first hand input on the tentlabs clock upgrades?
Would appreciate if anyone can shed more light on this.
How big was the difference if at all you did use any of his clock products in your gear?
Thanks,
Saachi
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