smuel
Junior Member level 3
lm2976
Hi,
I need to build a power supply with 18V and 5V DC. I seem to have 2 options...
Transformer (18V)-> rectifier -> 7818 regulator -> 7805 regulator
or
multitap transformer -> 2 seperate rectifiers -> regulators
i figure in the first case, the 7805 could get pretty hot. but in the second case i need double the filter caps.
any thoughts?
Thanks
Sam
Hi,
I need to build a power supply with 18V and 5V DC. I seem to have 2 options...
Transformer (18V)-> rectifier -> 7818 regulator -> 7805 regulator
or
multitap transformer -> 2 seperate rectifiers -> regulators
i figure in the first case, the 7805 could get pretty hot. but in the second case i need double the filter caps.
any thoughts?
Thanks
Sam