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High Quality, Buildable Audio Preamp Design On Net?

Discussion in 'Electronic Design' started by abby, Jan 20, 2009.

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  1. abby

    abby Guest

    Hi,

    Are there any high quality, easily buildable audio preamp designs
    available on the net? I found quite a few but I'm not knowledgeable
    enough to judge how good they are.

    I am upgrading my stereo power amp (PS-Audio A-100 current favorite)
    and need a good quality preamp, including phono, to match. I would
    prefer to build from a design or kit. I designed a preamp for my old
    power amp but it won't be adequate for the replacement.

    Thanks,
    Gary
     
  2. Rich Grise

    Rich Grise Guest

    Have you tried googling?

    Good Luck!
    Rich
     
  3. Darren Holdstock

    Darren Holdstock

    5
    0
    Jan 20, 2009
    Most hi-fi preamps use the standard op-amp circuits; if you want them to sound nice, use decent op-amps and capacitors (never electrolytics or tantalums) and pay attention to PCB layout.

    As for the phono amp, you can't go wrong with a John Linsley-Hood shunt feedback design. It comes in two flavours, one with transistors, and one with op-amps, and is configurable for MC and MM cartridges. If you can't find it on the web, let me know and I'll see if I can't dig it out for you.
     
  4. Guest


    http://sound.westhost.com/projects-2.htm

    Michael
     
  5. abby

    abby Guest

    Unfortunately, those circuits are similar to those I already found. I
    dismissed them because high feedback circuits are deprecated.
    Low feedback, very linear circuits are considered superior. Are
    there any of those on the net?

    Thanks,
    Gary
     
  6. Silicon Chip have published several over the years, like this one:
    http://www.siliconchip.com.au/cms/A_107103/article.html
    They have done many individual preamp modules and phono modules etc
    too.

    The articles usually come with full AP and other test results, so you
    know what performance you are getting.

    Kits are usually available from Altronics or Jaycar:
    http://www.altronics.com.au/index.asp?area=item&id=K5500

    Dave.
     
  7. abby

    abby Guest

    At over 80 and growing this is by far the most responses to any of my queries.
    And some actually addressed the question! :)

    Pardon my naiveté. I have seen so many references to the feedback issue (IIRC,
    including in this newsgroup recently) I'd assumed it is a given. Apparently,
    not.

    What I infer from the responses, particular jd_lark's, is that the main culprit
    is transient intermodulation, TIM. Given sufficient bandwidth, slew rate, and
    power supply voltages the feedback related problems go away or, at least, become
    minimal. And current devices can do that. Is that correct or am I still
    missing something? I should point out that I am interested primarily in
    preamps.

    I do agree about audiophiles. While I'm sure there is a rare individual who can
    tell the difference between Monster cables and zip wire too many "audiophiles"
    are little more than spec-junkies. I guess I am not a true audiophile because
    my speaker wires are the zip cord the guy who sold me the speakers gave me.
    Some of you might find PS Audio's site interesting, psaudio.com. They offer
    some expensive power conditioning equipment (in case your audio designer
    couldn't produce a decent power supply) including a $999USD power cord.

    Thanks,
    Gary
     
  8. JosephKK

    JosephKK Guest

    ISTR something about the audio pulses and Fourier transforms showing
    that much of the claimed distortion was artifacts of using audio tone
    bursts. It seems that the modulation used to create the tone bursts
    caused most if not all of the measured distortion.
     
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