Uploaded June 2024 | Updated September 2026, 2 weeks ago

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Today feels like a good day for a nice relaxing kit build.
Today's kit is the "Burglar Alarm with Time Delay NE555 DIY soldering kit" from Universal Solder

universal-solder.ca/burglar-alarm-with-time-delay-diy-kit

It's a relatively straightforward set of circuits that are a decent demonstration of a few circuit principles, and builds up into a nice little finished product.


For a better understanding of the oscillator part, here is the book that several generations of hobbyists learned from:

Engineer's Mini Notebook- 555 Timer IC Circuits by Forest Mims
archive.org/details/555-designs

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This isn't the only way to do it.
It's probably not the best way to do it.
But it's how I did it.