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.
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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?
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| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus |
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| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
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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.
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.
can
...Jim Thompson
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| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
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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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