Hi
sorry to dig up an old thread, but i just have a quick question and this is very relevent - I am building a relay box/power supply/square wave generator.
I plan on having 230v IEC mains plug on the back, through a fuse, transformer to 15v, bridge rectifier (with the filter caps earlier in the thread).
Now on to the question, I want to have a 7805 drawing 200mA, a 7805 capable of drawing 1A, and a 7812 capable of drawing 1A.
What size of capacitor would be suitable to use as the storage cap (the one that goes after the rectifier before the regulator. I have a few 2200uF and a few 4700uF. would any of these (or a combination) be suitable for this, if not what would?
The load on 1 of the 7805's and the 7812 may be switched on and off regularly.
I have all the smaller caps for use with the regulators.
Thanks