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  1. Old Comment
    cobretti's Avatar

    Superregs for your line-level projects

    What is the output noise at 15VDC ?
    Posted 26th June 2016 at 04:37 PM by cobretti cobretti is offline
  2. Old Comment

    ESI Juli@ analog card interface details

    Thanks a lot for the information, it's very helpful.

    There might be an error or two with the pinout.

    - J3 pin 19 probably isn't "hpf enable" but cks1 (pin 16 on the adc).
    - J3 pin 8 could be used to send a mute signal 60ms after a fs change. The rest of the time, it would indeed show dvdd as the mute pin would be "H".

    This overall schematic can be useful too:

    Sources: :: Zobraziť tému - Analógová časť ESI Juli@ + I2S and :: Zobraziť tému - ESI Juli??
    Posted 23rd June 2016 at 08:10 PM by 00940 00940 is offline
  3. Old Comment

    The Amplifier of 100 Transistors (output devices)

    This is a awesome project, I love it
    Posted 21st June 2016 at 10:32 AM by MR Overclock MR Overclock is offline
  4. Old Comment

    Surprisingly Good Performance - The Amplifier of 100 Transistors

    Have you put any thought about PSRR? IMO youll have a more enjoyable outcome by designing an AMP with xtreme PSRR measurements than vanishing low THD measurements. I see all too often over emphasis on designing an amp with super low THD measurements, but end up with a dry, brittle, sterile amp. But the opposite it true for those who focus on PSRR as there main objective. Just my 2 cents, since I really like your amp build.
    Posted 10th June 2016 at 05:47 AM by erik777 erik777 is offline
    Updated 10th June 2016 at 05:54 AM by erik777
  5. Old Comment
    Tam Lin's Avatar

    High Sample Rate PCM

    Originally Posted by tritosine
    17 bits worth of monotonicity, and uselessly high sample rate, that won't help it ?
    Above 768K, the DACs handle only the delta, which is typically 5 bits, max 12. In the realm of modern computers, 2^12 is a very small number making it trivial to adjust each and every sample to correct linearity errors.
    Posted 8th June 2016 at 08:15 PM by Tam Lin Tam Lin is offline
  6. Old Comment

    Surprisingly Good Performance - The Amplifier of 100 Transistors

    Nice..deserves a thread on the solid state forum ...
    Posted 5th June 2016 at 02:36 PM by kasey197 kasey197 is offline
  7. Old Comment

    Can you identify this opamp from its simplified schematic and PSRR plot?

    It was a later design, I use the simplify input stage of LM108 with JFET-BJT Cascode Current Source or I should say BJT-JFET, and Full Wilson Current Mirror
    Posted 4th June 2016 at 02:04 AM by TavoNice TavoNice is offline
  8. Old Comment

    And then there were two... Amps of 100 Transistors

    No, not specifically. I did test their operation, as I did not want to be searching through all those output devices looking for which one was misbehaving.

    They all came from one batch each of NPN and PNP.

    During the measurement process, I noticed that the HFE were all very close for each of the PNP and NPN groups.
    Posted 3rd June 2016 at 02:03 PM by googlyone googlyone is offline
  9. Old Comment

    And then there were two... Amps of 100 Transistors

    Did you HFE match the transistors?
    Posted 3rd June 2016 at 08:22 AM by erik777 erik777 is offline
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