Re: Final final 1kHz oscillator

On 24/11/2024 5:10 pm, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vhue9h$243sl$1@dont-email.me...

On 24/11/2024 5:11 am, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vhs1ea$1kbt4$1@dont-email.me...

On 23/11/2024 4:12 pm, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vhrma8$1io30$2@dont-email.me...

On 23/11/2024 3:32 am, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vhp713$12bnt$2@dont-email.me...

On 21/11/2024 1:00 am, Bill Sloman wrote:

On 20/11/2024 2:03 pm, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vhjj2v$24eu4$3@dont-email.me...

On 20/11/2024 1:29 pm, Bill Sloman wrote:

On 20/11/2024 12:59 pm, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vhibce$1t7v2$1@dont-email.me...

On 18/11/2024 2:58 pm, Edward Rawde wrote:

"JM" <sunaecoNoChoppedPork@gmail.com> wrote in message news:n7iijjdeqecl0kmub0bq5in0dbm60m7qam@4ax.com...

On Thu, 14 Nov 2024 11:14:28 -0500, "Edward Rawde"
<invalid@invalid.invalid> wrote:
>

"JM" <sunaecoNoChoppedPork@gmail.com> wrote in message news:t5fajjdteskfftvkf84iqsp2vc4b9ta5kj@4ax.com...

On Fri, 8 Nov 2024 15:43:41 -0500, "Edward Rawde"
<invalid@invalid.invalid> wrote:

>

...

>
I found that adding a couple of 14nmH ferrite beads around the transistors and the FETs stopped the simulation dropping out
after getting stuck on a too-short time step.

>
Additional components in the simulation that you could probably leave out of a real circuit. I've found another place to put a
ferrite bead which speeds up the simulation ever more, but it is till not all that quick.
>

The current version isn't simulating all that fast - I let it run over-night and the amplitude control feed back loop turned
out
to have been underdamped to the point of instability - it kept on hitting the rails and overshooting back into them. The
current
version - with more damping - is now on it's second millisecond.

>
Ok well when you've got a circuit which rivals the one I posted for harmonic distortion and component count let me know.

>
I'm not going to be constrained by that.

 Ok I'll settle for matching the harmonic distortion level, even if you need 1000 components.

The current version has the second harmonic 103dB below the fundamental, the third harmonic 80dB down. I had to run it over-nigh to get a couple of seconds of operation - the second second looked good.
A couple of millivolts of second harmonic makes it through to the FET gate from the full-wave rectifier. If I can lag it by another 156usec it may reduce the harmonic content, rather than increasing it.
So far the revised circuit has only clocked up 4msec of operation. Maybe I'll have more tomorrow.
I haven't bothered counting the components. Some of them could be ditched when the design gets closer to a definitive version. The three transistors get around a potential output swing limitation which probably won't be a problem.
--
Bill Sloman, Sydney

-- Bill Sloman, Sydney
>
>