Path: ...!eternal-september.org!feeder2.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: john larkin Newsgroups: sci.electronics.design Subject: Re: High purity 1kHz oscillator Date: Wed, 23 Oct 2024 10:44:37 -0700 Organization: A noiseless patient Spider Lines: 14 Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Injection-Date: Wed, 23 Oct 2024 19:43:01 +0200 (CEST) Injection-Info: dont-email.me; posting-host="7c9cdd419075a565072e82c6114734de"; logging-data="2256609"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18yLQTXOyZwXMpeYTDtiGP4" User-Agent: ForteAgent/8.00.32.1272 Cancel-Lock: sha1:s4tGI6xijD2d1Nxm3VtT4sMi9x8= Bytes: 1446 On Tue, 22 Oct 2024 01:10:41 -0400, "Edward Rawde" wrote: >But I suspect that component tolerances and mismatched FETs will ruin it. The very best bulk metal foil resistors have voltage-resistance coefficients of a few ppm/volt. Most resistors are much worse. Just the resistors can kill distortion specs. At low frequencies, self-heating and tempco can add distortion too; the old HP oscillators had that effect from the lamp filament. DGMS on capacitor nonlinearity.