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Failed to connect to MySQL: (1203) User howardkn already has more than 'max_user_connections' active connectionsPath: ...!2.eu.feeder.erje.net!feeder.erje.net!fdn.fr!proxad.net!feeder1-2.proxad.net!news.mixmin.net!news.neodome.net!usenet.blueworldhosting.com!diablo1.usenet.blueworldhosting.com!nnrp.usenet.blueworldhosting.com!.POSTED!not-for-mail From: "Edward Rawde" Newsgroups: sci.electronics.design Subject: Re: Final final 1kHz oscillator Date: Mon, 18 Nov 2024 15:06:01 -0500 Organization: BWH Usenet Archive (https://usenet.blueworldhosting.com) Lines: 34 Message-ID: References: Injection-Date: Mon, 18 Nov 2024 20:06:08 -0000 (UTC) Injection-Info: nnrp.usenet.blueworldhosting.com; logging-data="97409"; mail-complaints-to="usenet@blueworldhosting.com" Cancel-Lock: sha1:kHY7KR9Oxavn3o4XBLwQMgeHxIw= sha256:TwYSMk3MW0N1bl9GdnGuhz9Yawj4f1jcYAA6zPEPnJY= sha1:hCPwQaydQ7/TXS7UGQfEtcc74ZA= sha256:VaxJX1vWoAOZvsx/WT9WApm0H5j68hd4HRcbdlcoF/o= X-Newsreader: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6157 X-MSMail-Priority: Normal X-Priority: 3 X-RFC2646: Format=Flowed; Response Bytes: 2879 "Bill Sloman" wrote in message news:vhadl5$2v27$1@dont-email.me... > On 15/11/2024 7:56 pm, Bill Sloman wrote: >> On 15/11/2024 3:14 am, Edward Rawde wrote: >>> "JM" wrote in message news:t5fajjdteskfftvkf84iqsp2vc4b9ta5kj@4ax.com... >>>> On Fri, 8 Nov 2024 15:43:41 -0500, "Edward Rawde" >>>> 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. > > It looks as if the 163kHz was coming from the LTC6655-1.25V precision reference. > > Putting in 4.7uF at C10 - rather than the 1.0uF I started off with - seems to make the simulation run a lot faster - about 20 > times faster - and cleaned out the visible hash coming from the voltage reference. > > The data sheet says use something between 2.7uF and 100uF and recommends film parts - ESR less than 0.1R. They don't like ceramic > parts. > > Pulling out the LCR filter (L5,L6, C19, C20, R22 and R23) may have speeded up the simulation too. > > The 2kHz and 3kHz harmonics aren't as good as they were - only about 65db below the fundamental - so Ill have to do some more > digging. I changed C10 to 4.7uF and ran the simulation to 10 seconds. L5 etc are still present. FFT from 2s to 10s says 60dB down at 3kHz > > -- > Bill Sloman, Sydney >