After posting my very tidy circuit on Reddit the other day, I got a few requests for a breadboarding guide. I came up with this:
I did this all in one take (with some editing), so sorry if it's a little sloppy. Regardless, it's chock-full of tips for breadboarding, and if your boards usually end up like a rat's nest, it's the best way you can spend 25 minutes.
So I've got a project coming up (that may have something to do with this tweet) that will require a few LED matrix displays. I found a suitable candidate online and ordered one to play around with. Since I already had the display, I thought it'd be fun to run it through the paces and build a little circuit out of it using some parts I had lying around.
For the past few weeks, I've been blogging my assembly of the transistor clock which is now hanging on the wall of my new apartment. One of the most interesting aspects of that clock is how it keeps time.
Most clocks today use high precision crystal oscillators or dial out to some atomic clock somewhere (like your cellphone), but the transistor clock actually uses the 60Hz AC coming out of your wall socket to keep time. While this method was once common use, it's certainly unconventional by today's standards. I decided it would be fun to try to investigate exactly how accurate the 60Hz coming out of the wall is.