Hahahahahahahahahahahahaha
Turtle carrying barber shop
A very cute PCB, slightly larger than an eraser, and can be used as a pendant.
The NE555 and CD4017 used are very simple in principle and have a small number of components, making them suitable for entry-level practice.
The cost is only a few dollars (funny)
The difference is that a PW5100-50 is used to boost the Cr2032 button battery to 5v.
Adjust the potentiometer to change the frequency
In actual testing, the minimum input voltage is 0.9V to maintain normal operation.
There are almost no traces on the front of the PCB so it is very beautiful/////
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