Voltage Regulator - L7812CV

[john2k]

I have a L7812CV voltage regulator that I would like to use for automotive application. Need help selecting the correct capacitors for the input and output for ripple rejection. The datasheet uses an example of putting a 330nF capacitor on the input and a 100nF capacitor on the output. The regulator will mainly be powering a load of about 200mA. Would the 330nF and 100nF be fine? or should i increase the capacitor on the output? if so any suggestions?

Thanks

 

[duke37]

Where are you getting the power from?
You will need 15V on the input to get 12V on the output. The 3V difference is known as the drop out.

If a regulator is working properly, there will be negligible ripple on the output, the capacitors are there to ensure stability. Why not look up the data sheet?