i am trying to make a 24vdc power supply, sounds simple but the 240vac to 24vdc transformer i do not have any option to use has an output that can get up to 40vac also i need to make the common line common to both ac and dc so i can not use a full bridge but can only use a single diode, so i loose half the wave and use a 1000uf cap to pull it up again, on the plus side i only need 120ma. SO using a 7824 in the usual arrangement i get my voltage but even with a heat sink i am getting 25 Deg C rise on the heat sink, due i think to the 7824 havig to drop 40-24 v so 16v. basically although this works i hate heat and consider the higher the temp the shorted life span the power supply will have.
SO any one got any idea's how i can make a simple power supply that will not get hot?
SO any one got any idea's how i can make a simple power supply that will not get hot?