The circuit teacher said the capacitor can not be 10uf, should not the same! Specifically did not say, ask the big god say, the specific capacitor should be how much ah! Check a lot, not found! Thank you!
By experience, C1 and C2 can be larger, such as to take 1000 microfarads to 2200 microfarads, C3 smaller, you can go to 100 microfarads.
Of course, the pressure is enough.
This is nothing to calculate, are experience only. In addition the other two capacitors on the right is generally a electrolytic capacitor (large capacity) +1 non-polar capacitor (small capacity), to improve the high-frequency power output characteristics
7815 left side of the capacitor with a larger, such as 100uF, the right side with 47uF, 78 series regulator output voltage can not be higher than the input, or may cause damage to the regulator, the use of input filter capacitor is greater than the output filter capacitor Can ensure that cut off S1, the input voltage is higher than the output. In general, the voltage regulator capacitor capacitor capacity is better, so that the filter effect is better.
