loosewire
New Member
I will be using some 120 VAC -> 9 VDC wall adapters for powering some simple classroom experimenter boards. The adapters have a rated output of 600mA. (Jameco part# 100175) I plan to clean and regulate this down to 5 VDC with a 7805 regulator.
The 7805 datasheet shows an example circuit with a .22uF cap for the input side and a .1uF cap for the output side. I have seen other circuits using 1000uF and 10uF for the input and output though. Why is there such a wide variance? And what are the pros & cons of using the different sizes? (These would be electrolytic and rated at 16v in all cases.)
Also, there is a similar wall adapter that provides 6VDC. But it is my impression that I should regulate these cheap adapters AND that the 7805 wouldn't work well with such a small difference between the input and output voltages. Are these impressions correct?
Thanks.
The 7805 datasheet shows an example circuit with a .22uF cap for the input side and a .1uF cap for the output side. I have seen other circuits using 1000uF and 10uF for the input and output though. Why is there such a wide variance? And what are the pros & cons of using the different sizes? (These would be electrolytic and rated at 16v in all cases.)
Also, there is a similar wall adapter that provides 6VDC. But it is my impression that I should regulate these cheap adapters AND that the 7805 wouldn't work well with such a small difference between the input and output voltages. Are these impressions correct?
Thanks.