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Happy Chinese New Year!Elecrow will be on holiday from February 14–22 (GMT+8). You may still place orders of products and manufacturing services as usual, and we will resume production and shipping by February 25.
I present to you a circuit which is a little outdated, but quite pleasant for some, I saw that this LM3909 is still found and I said to draw a pcb. I added a multi-channel switch, dip switch, which allows us to choose which number we want to display. Maybe you want to dial a certain number to celebrate something special.
Notes: pay attention to the display model.
I hope you like this board, if so, maybe you can help me with another LM3909 IC. ????