Re: [Distillers] For Rob - Switching (was) Re: Calm down children!
any chance of a diagram?
Now, if you can just build the rest of the automatic "cat sh*ts=cat
burns" device, I can stop hunting the net for solutions to my
inhospitable garden problem (bigG).
p.s. Yes, Harry I'm still here, despite what I said.
--- Sven Pfitt <the_gimp98@...> wrote:
> Use the 555 link that others posted, and build a timer with a 1Cheers,
> second time interval.
> Use a comparitor with the '-' input feed by a 10K potentiometer wiper
> and a 4.7K resistor on each end (to VCC and GND).
> Take the output of the 555 timer capacitor terminal and connect it to
> the '+' terminal of the comparitor.
> Take the output of the comparitor and use it to drive the SSR-240D25
> (+ terminal to VCC, -terminal to the comparitor output). I recommend
> running the 555 and comparitor circuits on about 12V.
> You now have a burst fire controller with zero cross (minimal noise
> generation). The comparitor will turn on when the setting sees the
> ramp capacitor voltage above the potentiometer setting. The cap
> voltage varies from 1/3 to 2/3VCC. The two resistors allow you to use
> more of the ajustment range that if you simply attached the pot to
> VCC and GND without them.
> MOUSER has them (SSR-240D25) at a slightly lower price.
> --- In Distillers@yahoogroups.com, "Robert Hubble" <zymurgybob@...>
> > Harry,
> > Thank you and all the others for answering my 50-year-old question
> about the
> > bi-metal infinite switch. Although I currently use propane to power
> > potstill, I am looking at building a continuous-run reflux still
> after the
> > one on Tony's site, so I MAY be in the market for building a good
> > controller.
> > I have looked at the 555 or counter controlled SSR as mental
> > (while making long drives) for a long time, but I think push is
> coming to
> > shove pretty soon now. I'm a long-time user of the Howard W. Sams
> > literature, from the Sam's Fotofact "How to repair your electronic
> > of the 1950's to the later cookbooks they do so well. I even
> worked with a
> > woman who wrote one of the Sam's how to UNIX books. After reading
> this, I
> > went straight to the cookbook section of my electronics library,
> and the 555
> > cookbook was gone, loaned out, I guess, or maybe in a project box
> in the
> > garage.
> > Anyway, all this drove me to make a parts search for the solid-
> > and Digikey is my search-engine of choice. The Potter-Brumfield
> > at $38.62 US, is opto-coupled, zero-crossing, 280V and 25A relay.
> For those
> > who do not know, ordering almost anything through Digikey
> > is pretty easy.
> > Thanks for the answer, and thanks for getting me thinking about the
> > vodka-fuel still again.
> > Zymurgy Bob, a simple potstiller
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