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Path: ...!news-out.netnews.com!postmaster.netnews.com!us11.netnews.com!not-for-mail X-Trace: DXC=CmgA^0g9K]aIQi<RSX3BniU5[F2hIijDo7J470dMQQ7kHFjJ2MJUSTb;dFo]Kk\e]de^mW?D9fI3m;n=QkXMlA5nEP?S5IYaD:mn_i[Z4@N@If X-Complaints-To: support@frugalusenet.com Date: Fri, 24 May 2024 14:02:23 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: An actual circuit Newsgroups: sci.electronics.design References: <v2o5p4$3102$1@nnrp.usenet.blueworldhosting.com> <a38v4jpecnm460gf7ghqfgpmpespoie6f8@4ax.com> <bk815jh3skuecf1tap8o41rpgdh5kkq8o5@4ax.com> <v2qdh5$u4j$1@nnrp.usenet.blueworldhosting.com> <phk15jlc055d4p4b1qlicodl16v85u00d9@4ax.com> <6650d5a6$0$2363133$882e4bbb@reader.netnews.com> Content-Language: en-US From: bitrex <user@example.net> In-Reply-To: <6650d5a6$0$2363133$882e4bbb@reader.netnews.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Lines: 19 Message-ID: <6650d62f$0$2363134$882e4bbb@reader.netnews.com> NNTP-Posting-Host: 127.0.0.1 X-Trace: 1716573743 reader.netnews.com 2363134 127.0.0.1:39457 Bytes: 1834 On 5/24/2024 2:00 PM, bitrex wrote: >> Yes, it is mysterious. Set both drain resistors to 3.3K and zoom way >> up on the two source voltages for the first 20 seconds. >> >> LT Spice may have some hidden asymmetry. It has to do math >> sequentially, maybe. >> >> In real life, parts will be plenty asymmetric. Especially jfets. >> > > There are bunch of variants of this circuit, I call it the "Forest Mims > Oscillator" cuz in one of his radio shack circuit books was where I > first remember seeing it as a teenager. I'm pretty sure he didn't invent it though and that I've seen it in books from the 60s also, it was probably invented about 5 minutes after the PNP.