Some projects that don't take up a whole page but are cool anyway.

Sometimes we run across something that isn't a huge project, but is more like a nifty trick. Here's a few:

When current flows through a speaker, it creates a change in its shape. If there is an oscillating current, it will create a buzz or a tone. Creating that oscillation usually requires a somewhat complicated electronic circuit, but here we use the speaker itself as an oscillator: when the circuit is completed, the speaker pulses and bounces the connection apart, causing the circuit to open, which relaxes the speaker...

new adventures in hi-555

Above: a simple circuit incorporating a 555 timer, which blinks an LED at a variable rate.

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