Simple 12-180V boost converter using the 555 as controller

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The most interesting aspect of the circuit is how an ordinary 555 is used to regulate the output voltage. Now, there are hundreds of switched mode controllers ICs on the market which are all better suited for this job than the 555. The problem with all these ICs is that if you build a nice NIXIE clock using them, and at one moment in the future the IC breaks down, it is more than likely that it is already obsolete and out of production. The 555 is (very) cheap, performs well enough and most likely will remain in production forever.

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Simple 12-180V boost converter using the 555 as controller