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That's absolutely right.The 7805 is reliable, cheap, and all that is needed for this design. Why would I spend $11.85 for a 5V regulator when a $0.25 LM7805 part will do?
That's absolutely right.
I've thought, you would stabilize the 12V Voltage via Zener Diodes.
That is very ineffective, so I would suggest You to use a Switching Power Supply.
you don't really need them unless you're in a noisy environment. I did this design to run off the same power supply as a 1/2 horse power motor, and you could hold the unshielded board right up beside the motor while it was running without it resetting. They are also a good idea if you're building a commercial product and have to pass FCC testing, or what's equivalent to our FCC in your country. They keep the microcomputer switching noise off the power supply line and vice versa. They filter out the 3.6MHz crystal frequency.
lol ..it not going for any FCC that for sure...
For home use i guess i dont need it. Can blender or vacuum cleaner in my house create motor like noise in the main AC and cause my Uc to hang.
My power supply design is very straight forward
its 220VAC to 12VAC transformer to full wave rectifier bridge to 2200uf and .1uf cap to LM7805 input pin. Output pin of LM7805 also has a 0.1uf.
anything is possible, but probably not unless you are running this in the kitchen along side them and off the same circuit.
I would also suggest a 10uF on the output of the 7805. There should be a .1uF on the input and output of the 7805, as close as possible to the device.