{"id":3024,"date":"2012-10-10T13:05:24","date_gmt":"2012-10-10T20:05:24","guid":{"rendered":"http:\/\/crimeandtheforcesofevil.com\/blog\/?p=3024"},"modified":"2012-10-10T13:05:24","modified_gmt":"2012-10-10T20:05:24","slug":"complexity-rating-_no_","status":"publish","type":"post","link":"https:\/\/crimeandtheforcesofevil.com\/blog\/2012\/10\/10\/complexity-rating-_no_\/","title":{"rendered":"complexity rating _no_"},"content":{"rendered":"

You may and may not recall that I built a little optical theremin.<\/p>\n

<\/p><\/blockquote>\n

Basically, I’ve been trying to develop an electronic instrument project that could be built, in a workshop environment, at nwcMUSIC at Norwescon. It had to be really simple, but functional. And I can – what you can see in this picture totally works! It could be simplified further just by swapping those three resistors with one of similar value.<\/p>\n

But the output is really, really quiet. Sure, I could – and did – add a matching impedance stage and hook it up to my amp, and that<\/em> worked, but we can’t do that in a workshop.<\/p>\n

So I wanted to add a pure amplification stage, using an amplifying transistor. I hooked all that up and: silence<\/em>. After a few minutes, I realised that I was attempting to amplify a signal with a lower-power source than what I had to begin with. That<\/em> won’t work.<\/p>\n

And I could fix it, either by adding an impedence-matching voltage transformer (complexity rating no<\/em>) or a second power stage, but it would take it well above my complexity limit for a one-hour workshop.<\/p>\n


That won’t work either<\/i><\/p><\/blockquote>\n

So then I thought, “all these components are rated 40v, let’s just double the input power to 18v and see what happens.” And what happens is fire<\/em>.<\/p>\n

Or, at least, a surprisingly enthusiastic<\/em> outbreak of magic blue smoke. And now nothing works, and now the little battery-powered air filter I built is running.<\/p>\n

And that’s why there’s no DIY project today.<\/p>\n

See you next week. XD<\/p>\n","protected":false},"excerpt":{"rendered":"

You may and may not recall that I built a little optical theremin. Basically, I’ve been trying to develop an electronic instrument project that could be built, in a workshop environment, at nwcMUSIC at Norwescon. It had to be really simple, but functional. And I can – what you can see in this picture totally [&hellip<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,11],"tags":[],"class_list":["post-3024","post","type-post","status-publish","format-standard","hentry","category-diy","category-recording-gear"],"_links":{"self":[{"href":"https:\/\/crimeandtheforcesofevil.com\/blog\/wp-json\/wp\/v2\/posts\/3024","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/crimeandtheforcesofevil.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/crimeandtheforcesofevil.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/crimeandtheforcesofevil.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/crimeandtheforcesofevil.com\/blog\/wp-json\/wp\/v2\/comments?post=3024"}],"version-history":[{"count":0,"href":"https:\/\/crimeandtheforcesofevil.com\/blog\/wp-json\/wp\/v2\/posts\/3024\/revisions"}],"wp:attachment":[{"href":"https:\/\/crimeandtheforcesofevil.com\/blog\/wp-json\/wp\/v2\/media?parent=3024"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/crimeandtheforcesofevil.com\/blog\/wp-json\/wp\/v2\/categories?post=3024"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/crimeandtheforcesofevil.com\/blog\/wp-json\/wp\/v2\/tags?post=3024"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}