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Small Signal Audio Design 3rd edition: Douglas Self
Small Signal Audio Design 3rd edition: Douglas Self
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Old 20th September 2019, 08:16 PM   #81
forr is offline forr  France
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I'd like to see developpments on the Schlotzaur voltage follower (2nd edition, page #93).
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Old 21st September 2019, 06:55 AM   #82
jjasniew is offline jjasniew  United States
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Douglas,

Yes, some old vintage amplifiers simply used the chassis as a universal ground path, rather than run connections on a ground bus, tied to chassis at a single point. (I assume it was a cheaper manufacturing build that way) My point being that it sounds OK - despite multiple good design practice violations - might be something to write about. Others have reported similar perceptions with such technically sub-par equipment. How is that possible?

Yes, I am thinking power amplifiers, but Analog, yet interfaced directly to a computer via a USB DAC. The small signal part would begin at the audio DAC outputs, in turn driving more small signal circuitry that eventually drives the power output devices. There may be more to it than simply connecting half A (the DAC) to half B (The Amplifier) that's worthy of consideration. Particularly if the DAC has 4 or more outputs, each with DSP capabilities.
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Old 21st September 2019, 03:40 PM   #83
DouglasSelf is offline DouglasSelf  United Kingdom
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Quote:
Originally Posted by jjasniew View Post
Yes, some old vintage amplifiers simply used the chassis as a universal ground path, rather than run connections on a ground bus, tied to chassis at a single point.

I don't think that counts as 'having the chassis in the feedback path'.
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