Path: ...!news.roellig-ltd.de!open-news-network.org!weretis.net!feeder8.news.weretis.net!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: Cursitor Doom <cd999666@notformail.com>
Newsgroups: sci.electronics.design
Subject: Re: Random thoughts on sinewave oscillators
Date: Fri, 18 Oct 2024 16:59:41 -0000 (UTC)
Organization: A noiseless patient Spider
Lines: 24
Message-ID: <veu45s$3cmo3$5@dont-email.me>
References: <vep97r$2cpo$1@nnrp.usenet.blueworldhosting.com>
	<veqsjk$2nec8$1@dont-email.me> <ver5b2$2p6tm$1@dont-email.me>
	<vesdmi$1npd$1@nnrp.usenet.blueworldhosting.com>
	<vetde5$38sbk$1@dont-email.me>
	<vetukv$1ici$1@nnrp.usenet.blueworldhosting.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Injection-Date: Fri, 18 Oct 2024 18:59:41 +0200 (CEST)
Injection-Info: dont-email.me; posting-host="9b90de9d1ae1f7c8b4022e9e677d9d81";
	logging-data="3562243"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX1//hSrxmUPwuOnMj9DSeZ41eQYlML2IiZA="
User-Agent: Pan/0.149 (Bellevue; 4c157ba)
Cancel-Lock: sha1:AQsKP0RN80bSflSIrWBaxr8uETo=
Bytes: 2192

On Fri, 18 Oct 2024 11:25:19 -0400, Edward Rawde wrote:

> "piglet" <erichpwagner@hotmail.com> wrote in message
> news:vetde5$38sbk$1@dont-email.me...
>> Edward Rawde <invalid@invalid.invalid> wrote:
>>>
>>> The circuit below produces a reasonable looking sinewave but the rise
>>> time still seems to be slower than the fall time. It may be that the
>>> amplifier in use is not ideal for this.
>>>
>>>
>> Could that just be second harmonic distortion? You could test the
>> amplifier by uncoupling the Wien network and injecting test inputs.
>>
>> Elsewhere I think your amplitude control problems could be simply due
>> to too much gain.
> 
> Perhaps, but I've not so far been able to get the circuit I posted in
> response to Bill to produce a sine wave no matter what I do with the
> control loop gain.
> It either grows to clipping or dies.

That's the main purpose behind having a thermistor or filament bulb in the 
f/b path.