High Quality, Buildable Audio Preamp Design On Net?

Have you tried googling?

Good Luck! Rich

Michael

-- EVERYONE who supported slavery was free. EVERYONE who supports abortion was born. That's how oppression works. "They're not really people" - we've heard that before! -

Chris

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

Silicon Chip have published several over the years, like this one:

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:

Dave.

one:

Extra info:

Dave.

one:

Ooooooh! Such a steal ;-)

...Jim Thompson

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

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TIM mostly comes from the dead-band region in a class-B output stage. It can take a helluva slew rate to avoid. Better attacked by a stable class-AB bias scheme.

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...Jim Thompson

(IIRC,

culprit

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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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