Hi, I have build an Linear Power Supply similar like that on the attached picture.
I use and 230:6x2 transformer that is insulated in epoxy.
Line (socket) that is connected is about 235V-245, 50Hz (EU).
Instead the C1 470u of the pic use 2200u, and instead C3 100n block, I use 100u electrolytic.
The load that is connected is an led strip, that makes less than 200mA.
The transformer is rated for 1A output like the LM7812 and the Diode Bridge.
My problem is that the Transformer and the Volt Regulator (LM7812) get very hot (60-80Celsius).
Transformers in normal condition get warm. But mines get very hot.
My question is: Why the transformer and 7812 get very hot even the load is less then 200mA, and transformer and 7812 are rated for 1A.
Thanks in Forward.
I use and 230:6x2 transformer that is insulated in epoxy.
Line (socket) that is connected is about 235V-245, 50Hz (EU).
Instead the C1 470u of the pic use 2200u, and instead C3 100n block, I use 100u electrolytic.
The load that is connected is an led strip, that makes less than 200mA.
The transformer is rated for 1A output like the LM7812 and the Diode Bridge.
My problem is that the Transformer and the Volt Regulator (LM7812) get very hot (60-80Celsius).
Transformers in normal condition get warm. But mines get very hot.
My question is: Why the transformer and 7812 get very hot even the load is less then 200mA, and transformer and 7812 are rated for 1A.
Thanks in Forward.
Last edited: