I'm designing a PCB to put a 'generic' power supply on. I never get single pcb's, always a eurocard full, so it's handy to be able to design a card that i can make a power supply for all voltages on.
Assuming I make a bog standard linear power supply, that is:
transformer -> bridge rectifier - > "storage" capacitors (linked to earth) -> fixed voltage regulator -> Capacitor (linked to earth) -> Output
what I'm trying to understand is what capacitors i should use before and after the regulators.
I understand that they need to be able to smooth out the voltage before the regulator, and that they should be specified 2x the RMS value of the AC. What about before their capacitance? Does the capacitance need to change if i change the voltage output?
Any resources on this topic would be appreciated.
cheers
R
Assuming I make a bog standard linear power supply, that is:
transformer -> bridge rectifier - > "storage" capacitors (linked to earth) -> fixed voltage regulator -> Capacitor (linked to earth) -> Output
what I'm trying to understand is what capacitors i should use before and after the regulators.
I understand that they need to be able to smooth out the voltage before the regulator, and that they should be specified 2x the RMS value of the AC. What about before their capacitance? Does the capacitance need to change if i change the voltage output?
Any resources on this topic would be appreciated.
cheers
R