The Wee Blinky kit from the Maker Shed is an easy-to-solder two (2) LED blinker circuit. It comes with a 9V battery snap, but will work with almost any voltage from 3V to 12V. A 9V battery is required but not included. It’s tiny, it blinks, and it’s a great kit to hone your soldering skills since it’s cheap too!
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A classic circuit, a 2 transistor astable. We did that at school, 20 years back.