Path: csiph.com!eternal-september.org!feeder.eternal-september.org!nntp.eternal-september.org!.POSTED!not-for-mail From: Christopher Howard Newsgroups: sci.electronics.design Subject: cheap analog square function? Date: Mon, 09 Feb 2026 14:52:20 -0900 Organization: A noiseless patient Spider Lines: 11 Message-ID: <877bslbhl7.fsf@librehacker.com> MIME-Version: 1.0 Content-Type: text/plain Injection-Date: Mon, 09 Feb 2026 23:52:21 +0000 (UTC) Injection-Info: dont-email.me; posting-host="d8d46cbb6189d44d650fb7cce12a3d05"; logging-data="3363783"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18iVNEkasf1URoo5B6MGrDM/UFq/4c0rT4=" User-Agent: Gnus/5.13 (Gnus v5.13) Cancel-Lock: sha1:8siiRfLxfPgQPs6PT/gpW4wv8BE= sha1:YSSn784hbzIwW8xlm0/fUMHfq6A= Xref: csiph.com sci.electronics.design:740256 Hi, I was wondering what is the cheapest (and hopefully, simple to wire up) way to get an analog square function. I.e., input a voltage x, and get voltage x^2 out. Or x^2/10. Or some reasonable approximation of either of those. The standard trick is to feed the voltage into both inputs of a multiplier chip. But even those AD633 chips are tough to afford on my budget (around 20 USD each). -- Christopher Howard