Hakierspejs Łódź badge, on which we teach people how to solder.
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Simple circuit
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Small number of components
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Relatively short assembly time
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Practical use
The circuit is an implementation of the LM3909 using discrete components, based on the design from the link below :
(https://www.righto.com/2021/01/reverse-engineering-low-power-led.html)
LTspice model is based on work from link :
(https://softsolder.com/2020/09/03/discrete-transistor-lm3909-led-flasher/)
