Gestern, 05:04 PM
Your schematic looks good.
Th NCH6300HV delivers 230V max. Assuming this number, some calculations:
R8 33k: U=230-68=162V | I=162/33000=0.0049A | P=0.8W
R15 36k display OFF: I=230/(36000+24000)=0.00383A | U=36000*0.00383=138V | P=0.53W
R15 36k display ON: U=230-70(assumed glow voltage)=160V | I=160/36000=0.00444A | P=0.71W
If your resistors have to handle this without help of something like a copper area or heat sink, they dissipate the energy by heating up. This is fine, as long as they are specified correctly and the temperature remains far below the melting point of the solder
.
Th NCH6300HV delivers 230V max. Assuming this number, some calculations:
R8 33k: U=230-68=162V | I=162/33000=0.0049A | P=0.8W
R15 36k display OFF: I=230/(36000+24000)=0.00383A | U=36000*0.00383=138V | P=0.53W
R15 36k display ON: U=230-70(assumed glow voltage)=160V | I=160/36000=0.00444A | P=0.71W
If your resistors have to handle this without help of something like a copper area or heat sink, they dissipate the energy by heating up. This is fine, as long as they are specified correctly and the temperature remains far below the melting point of the solder
.