Path: ...!news.mixmin.net!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Cursitor Doom Newsgroups: sci.electronics.design Subject: PSU Ripple Date: Sun, 10 Mar 2024 17:28:13 +0000 Organization: A noiseless patient Spider Lines: 17 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Injection-Info: dont-email.me; posting-host="2982adc9a211c867e1a7bf94a4046e9a"; logging-data="3240947"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+jNXTj4TU4ieWBkjlwUVfkb3ixQqvBljk=" User-Agent: ForteAgent/8.00.32.1272 Cancel-Lock: sha1:J5Wg2b/K4dNeQh2eFZGO9P56Qzc= Bytes: 1623 Returning to this Marconi signal generator which has a lot of ripple on the (linear) PSU output, I managed to get probes through a barely accessible crevice and get a couple of screen shots of the rectifier outputs I'm seeing on the scope. So there's mains incoming which goes into a toroidal transformer and thence to the rectifiers. There are two secondary windings on the transformer and they each get their own bridge rectifier. This is the waveform that's being applied to the storage caps of the PSU (which I've disonnected for testing purposes). The outputs of neither rectifier look at all correct to me. What does the Panel make of them? https://disk.yandex.com/i/CP8qRMy-QA-fCg https://disk.yandex.com/i/ubNazf1pFhuNtg (probes are on 10x and I did compensate them first)