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: Re: one potentiometer dividing multiple signals Date: Wed, 18 Mar 2026 08:25:39 -0800 Organization: A noiseless patient Spider Lines: 28 Message-ID: <878qbp3y0s.fsf@librehacker.com> References: <87ldfr6bqo.fsf@librehacker.com> <10pch1u$2stub$2@paganini.bofh.team> MIME-Version: 1.0 Content-Type: text/plain Injection-Date: Wed, 18 Mar 2026 16:25:41 +0000 (UTC) Injection-Info: dont-email.me; posting-host="17d1b7f4dfcfbf2fdb000a4db6b86ccd"; logging-data="4175639"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18pLrpQa68p1U4DUwNtyBOlKEaVwPteWvU=" User-Agent: Gnus/5.13 (Gnus v5.13) Cancel-Lock: sha1:4ycASp76yTGVkQIE3x/TTfP/iAY= sha1:95hTtmwpf7OJz+6DF0/TsDxbEe4= Xref: csiph.com sci.electronics.design:741848 antispam@fricas.org (Waldek Hebisch) writes: > Two potential ideas: > - build a bunch of dividers based on termistors. A single potentimeter > can provide control signal to a heater heating the whole assembly. > - similar idea but using fotoresistors and a light bulb. > I'm nervous about burning the bench down with the thermistor approach. But the photoresistor idea sounds appealing, as being a rather simple approach, that could be done with a cool LED. What approach would you suggest as far as having output voltage correspond to change in photoresistor resistance? Like, have the photoresistor pull input signal to ground? Or have an op amp with negative feedback resistor on the output side? > Or you can go half way to digital and use pulse with modulation. > Namely, one potemeter can control duty cycle of a generator. > Such generator can control several analog mutiplexers. Filtering > signal after the multiplexer you get input signal time duty cycle > of the generator. I few folks have mentioned variants of this idea. It sounds a little more complicated than I would prefer, but I'm keeping it in the back of my mind. -- Christopher Howard