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  1. Old Comment
    alexcp's Avatar

    Krell KSA-5 clone

    KSA-5 is a power amplifier that can drive speakers. I think using it as a line stage is an overkill unless your power amp is a gain-less buffer such as Firstwatt F4. Even then I guess you could live without the power transistors (Q23-Q26) and perhaps with fewer pairs of the driver transistors (Q15-Q22). Personally, I would rather use the BA-3 front end as a line stage, not the KSA-5.
    permalink
    Posted 26th February 2017 at 08:48 AM by alexcp alexcp is offline
  2. Old Comment

    Krell KSA-5 clone

    I wonder how it will perform as a line preamp
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    Posted 24th February 2017 at 02:35 PM by idir idir is offline
  3. Old Comment

    A one-dimensional two-channels stereophonic standard

    Hi, it means, that there shall occur sonic differences in one dimension, the lateral one, say from left to rite hand side.
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    Posted 22nd February 2017 at 03:44 PM by Grasso789 Grasso789 is offline
  4. Old Comment

    A one-dimensional two-channels stereophonic standard

    Hi!

    What does "one-dimensional" really mean here? What is "one-dimensional"? You have written that the standard shall be "one-dimensional".

    //
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    Posted 20th February 2017 at 08:45 AM by TNT TNT is offline
  5. Old Comment
    abraxalito's Avatar

    SAA7220 filter replacement project

    Glad you're interested, I've been working on other things as there seems to be so little interest.
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    Posted 20th February 2017 at 12:04 AM by abraxalito abraxalito is offline
  6. Old Comment
    triode_al's Avatar

    SAA7220 filter replacement project

    Sorry, I forgot my thinking!
    Still I am interested what comes out & how this can be shared.
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    Posted 19th February 2017 at 03:50 PM by triode_al triode_al is offline
  7. Old Comment
    abraxalito's Avatar

    Finally - a cheap FLAC player with digital out

    There are plenty of taobao agents to help buyers outside China.
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    Posted 16th February 2017 at 02:50 PM by abraxalito abraxalito is offline
  8. Old Comment

    Finally - a cheap FLAC player with digital out

    is not available on aliexpress for anyone living in outside china will hard to buying something stuff in taobao
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    Posted 16th February 2017 at 02:15 PM by oxoxbyx oxoxbyx is offline
  9. Old Comment
    alexcp's Avatar

    First Watt B1 clone

    Marc, apologies again as I am not getting any faster... I am attaching the Eagle project, PDFs with the schematic and the board, and the gerber files.
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    Posted 11th February 2017 at 03:14 PM by alexcp alexcp is offline
  10. Old Comment
    abraxalito's Avatar

    My latest infatuation - transformers

    No Youtube here, correct its blocked.

    Trafos will have some magnetostriction - meaning mechanical movement of laminations based on the change of flux in the core. Its normal.
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    Posted 2nd February 2017 at 12:49 AM by abraxalito abraxalito is offline
  11. Old Comment

    My latest infatuation - transformers

    I get sound From the transformers
    Like a 50hz trafo hum only it's whatever is playing through the amp
    Is YouTube blocked there too?
    permalink
    Posted 1st February 2017 at 10:39 AM by nige2000 nige2000 is offline
  12. Old Comment
    rjm's Avatar

    A power amplifier.

    Hi, thanks for the comment.

    Yes, if you want to push more than 1-2 W peak through this, you'll need to upgrade the output transistors. See note above.

    On the second point, it depends on whether you want to define crossover distortion only as the sharp break in the waveform as one transistors "hands off" to the other, or also include the fact that the two haves of the waveform are reproduced to slightly different scale. For the latter, matched transistors might help. For the former, you are correct.
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    Posted 1st February 2017 at 01:28 AM by rjm rjm is offline
  13. Old Comment
    abraxalito's Avatar

    My latest infatuation - transformers

    Yes, worth trying the edcores in step down.

    Not sure what you mean about playback noise?
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    Posted 1st February 2017 at 12:40 AM by abraxalito abraxalito is offline
  14. Old Comment

    My latest infatuation - transformers

    still have them edcore trafos 15k:15k with center taps
    is it worth trying? at 15k : 7.5k

    suppose id want inputs of 1 and 2v and output of 1v and 2v?

    sometimes i notice the output trafos unconnected to speakers make some playback noise is that normal?
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    Posted 1st February 2017 at 12:28 AM by nige2000 nige2000 is offline
  15. Old Comment

    A power amplifier.

    Nice to see someone design amplifiers! But this one is gonna blow up under heavy load, as BD139 and BD140 output transistors coming in TO-139 package are specified with 1A continuous (and sometimes 2A maximum) current, while 15V*1.4/8R is yet over 2A. Also, matching output transistors does not reduce XO distortion -- only raising bias current of output stage or introducing feedback of output signal can. Happy listening and good luck!
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    Posted 31st January 2017 at 07:54 PM by Grasso789 Grasso789 is offline
  16. Old Comment
    abraxalito's Avatar

    My latest infatuation - transformers

    Input transformer you can make the size of the ones I brought to your place in September - around 25mm core size. PQ2020 may well work fine. If you tell me your input and output peak voltages and lowest full-power frequency I'll design it for you.

    Its a signal transformer so we don't care very much at all about the winding resistance, so we can make it small using very fine wire.
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    Posted 30th January 2017 at 11:36 PM by abraxalito abraxalito is offline
  17. Old Comment

    My latest infatuation - transformers

    reducing the gain seemed to do the trick
    tried the autoformer method again
    fairly sure i prefer it

    what sort of spec would i need for the input
    is 20va too big of a core?
    permalink
    Posted 30th January 2017 at 11:01 PM by nige2000 nige2000 is offline
  18. Old Comment
    abraxalito's Avatar

    My latest infatuation - transformers

    Good reason to get yourself an input transformer with taps for gain no? Keep the chipamp at 20dB and adjust accordingly.
    permalink
    Posted 30th January 2017 at 02:19 PM by abraxalito abraxalito is offline
  19. Old Comment

    My latest infatuation - transformers

    ha... ! that wasnt worth censoring
    permalink
    Posted 30th January 2017 at 12:01 PM by nige2000 nige2000 is offline
  20. Old Comment

    My latest infatuation - transformers

    looks like i have to set the gain to suit the input voltage then
    pain in the **** for using the amp with different sources or testing on other guys systems
    permalink
    Posted 30th January 2017 at 12:00 PM by nige2000 nige2000 is offline
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