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Power supply maximum ripple voltage for microcontroller

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fences

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Hello,

I used very simple power supply for my circuit that used a micro-controller.
1.JPG

in my board exists 7812 for stabilization.
is it suitable fr micro?
If i use it, what problems may be occur?

thanks.
 

That will work if the micro operated on 12V. Since most operate on 5V and 12V would zap them, you could use a 7805 instead which gives a regulated +5V.
 
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    fences

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what a bout ripple voltage?
Could be better by increase cap value? like 1000 uF?
 

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