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<div class="moz-cite-prefix">Did you have a particular 555 in mind
Roy, or would ne555 do?</div>
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<div class="moz-cite-prefix">The thing is 555s need an external r/c
network - 2 more components than the relay here, and then a LED
and a resistor to visualise. Also don't you think that just using
one intuitive part (the relay) makes the whole concept of
oscillators clearer? It switches on, and then off, then on and
off. <br>
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<div class="moz-cite-prefix">Here is a picture of a 555 timer-based
oscillator in a magnetic stirrer I made from a computer fan when I
had delusions of biotechnology, and before schools had laser
cutters when I used to go to the Artifactory to make this kind of
stuff. Off to the bin with ya !<br>
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<div class="moz-cite-prefix"><img
src="cid:part1.LNgvDXXj.xV3TwWiT@quoll.com" alt=""></div>
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<div class="moz-cite-prefix">On 27/01/2022 5:13 pm,
<a class="moz-txt-link-abbreviated" href="mailto:rsskinner@optusnet.com.au">rsskinner@optusnet.com.au</a> wrote:<br>
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<p class="MsoNormal">A 555 chip would have done it.<o:p></o:p></p>
<p class="MsoNormal">Roy<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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