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I'm designing a PCB that has no earth ground but there are lots of connectors with shielding pins such as USB, Ethernet, and HDMI also their TVS diode to protect from ESD. This PCB has to pass the EMC tests, especially the immunity test, with success. I used a CMC filter in the input supply of...
Yes, you're right but there are 24IOs and all of them aren't inputs. I know that it can control the maximum of 12inputs at the same time.(as 4x3keypad. = 7inputs)
Hi everyone,
I have seen in a circuit had 12LEDs and 12Buttons before.
These buttons and LEDs has been controlled by only 3 pins thanks to 74HC595.
And I now need this circuit but don't have any idea how to make the circuit.
I would appreciate if you help me.
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