Re: A variation on my current mirror low distortion sine wave oscillator - 10dB less distortion and much the same number of components

On 20/02/2025 1:37 am, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vp4ou6$29vt1$1@dont-email.me...

On 19/02/2025 11:43 pm, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vp4ibd$28rod$1@dont-email.me...

On 19/02/2025 5:40 am, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vp1acj$1j5t7$1@dont-email.me...

On 18/02/2025 2:50 pm, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vp0svp$1d8re$6@dont-email.me...

On 18/02/2025 3:54 am, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:voujeq$11678$2@dont-email.me...

On 17/02/2025 3:53 pm, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:voualf$rm6g$8@dont-email.me...

On 17/02/2025 2:14 am, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vorsg8$emeo$7@dont-email.me...

On 16/02/2025 2:18 pm, Edward Rawde wrote:

"JM" <sunaecoNoChoppedPork@gmail.com> wrote in message news:gp6vqjl5oma32tga136kspreh7a8182ofg@4ax.com...

On Mon, 10 Feb 2025 17:18:01 +1100, Bill Sloman <bill.sloman@ieee.org>
wrote:

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But it doesn't matter to anyone else Bill.

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What makes you think that? You may find it a comforting thought, but it strikes me a self-serving delusion.

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It strikes me as an obvious fact.

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We can see that, and work out why.
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I'm not expecting anyone else to offer any comment but it's interesting that they haven't.

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Low distortion 1kHz oscillators are a pretty niche subject. It's pretty much audiophile-specific. I'm not actually an audiophile,
though I got a couple of letter into the UK HiFi News and Record Reviews back in the 1980's, but I got interested by some of the
weirder electronics they touted.
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And it's not like this group is only for the discussion of electronic matters, as the "Cracking Speech by JDV" thread shows.
You seem to be enjoying yourself there.

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Sending up Cursitor Doom can be fun.

 Which suggests that you enjoy being unpleasant.

He does post a lot of implausible claims. There's no pleasant way of saying that he's posting fatuous nonsense, but I don't go out of my way to make any more unpleasant than I have to.

...

I think the circuit JM posted is likely to work.

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Congratulations. You've said something  sensible for once.

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Why do you like to talk down to other people Bill?

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I don't especially like doing it but some comments make it unavoidable.

 Which suggests that unpleasantness is just part of your personality.

More a side-effect of being scrupulous.

It doesn't make you look superior, far from it.

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I don't feel any need to look superior, and scholar google demonstrates that I'm not. My wife has racked up many more citations -
psycholinguistics papers do get cited in larger numbers than my kind of stuff, but that isn't the crucial difference.
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https://scholar.google.com.au/scholar?hl=en&as_sdt=0%2C5&q=%22A+W+Sloman%22&btnG=
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Two BCM61B devices would probably be fine for the current mirror.
A single LT1679 can be used for U1,5,6,8 with a cheaper device for the rest.

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This is a less defensible observation.

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After more simulation I agree that all devices may as well be LT1679.

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That wasn't what I said, so "agree" isn't the right word. John May uses the cheaper LT1013 outside the oscillator signal path, as
anybody with an sense would.

 Anybody with any sense would look at the economics and go for the lowest possible cost when choosing between LT1678, LT1679, LT1013,
LT1014

Getting a good layout around an LT1014 or any other quad package can be tricky. There are cases where it can work, but if your ambitions involve getting stray signal 140dB below the fundamental, quads are best avoided.

It's nice to have a circuit ready for a practical build but I won't be building it myself.

No surprise there.

Two quad op amp packages.
This produces the lowest possible distortion in simulation.

If the simulation doesn't include realistic stray capacitances. Mine rarely do.
<snip>
--
Bill Sloman, Sydney