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From: Bill Sloman <bill.sloman@ieee.org>
Newsgroups: sci.electronics.design
Subject: Re: Final final 1kHz oscillator
Date: Fri, 15 Nov 2024 19:56:09 +1100
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On 15/11/2024 3:14 am, Edward Rawde 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 finally got around to digging out my AD734 based Wein bridge 
simulation, and created a FET based version.

It's got a nasty 163kHz generator embedded in it somewhere, and I've put 
in an RL filter to keep that under control.

The double Sallen and Keys network is a four pole Bessel filter which 
I'm using as a 250usec delay line - the output from the full wave 
rectifier has an appreciable 2kHz component, but the delayed 
contribution coming into the integrator through R9 roughly cancels the 
direct input through R20.

R10 in the integrator damps the amplitude feedback loop for a dead-beat 
response.

The harmonics in the 1kHz output are about 100dB below the fundamental. 
Not great, but respectable, and not worth trying to improve in a simulation.

The circuit still works with the worst case values for the 1% capacitors 
at C5 and C6.

Version 4
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