Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: piglet Newsgroups: sci.electronics.design Subject: Re: SSR question Date: Thu, 12 Sep 2024 20:09:31 -0000 (UTC) Organization: A noiseless patient Spider Lines: 20 Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Injection-Date: Thu, 12 Sep 2024 22:09:31 +0200 (CEST) Injection-Info: dont-email.me; posting-host="8b7f6ef5d0fc8febcc4778652cde8fa5"; logging-data="444407"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18/QH0Tp+L2gPZmyWeV/ROv" User-Agent: NewsTap/5.5 (iPhone/iPod Touch) Cancel-Lock: sha1:YAxxhFjOezYBTgbSmJnzcUBYKAg= sha1:v4wVuso2OfduFDvW87VaggbYGic= Bytes: 1594 john larkin wrote: > > Given a power supply that needs 120 volts AC input, I'd like to use a > small front-panel power switch at some low voltage, not run the AC > line up to the front panel. > > Do people make SSRs that would do that, accept a low-voltage switch > closure to switch AC? > > I think Piotr Wyderski posted a cool looking circuit using a small hf pulse transformer as isolation and coupling. Shorting the isolated LV side loaded or stopped an oscillator or something. The 1960s GE SCR manual showed ways to do that too but using 50/60Hz transformers which are now not cost effective. -- piglet