Hello, first of all I have to sorry about my english.
I wan study electronics with AVR(now atmega328) but there is no community in my country...
I have heat issue with LM7805. Here is my circuit
If relay on, LM7805's temperature rises over 50'C (24v 3A)
but relay off, LM7805's temperature under 40'C (about 37'c)
I tried
1. SW1 - Diode - Relay
(3pin) - (1N4148) - (5pin)
2. Relay - Diode - Relay
(2pin) - (1N4148) - (5pin)
3. Relay - Capaciter - Relay
(2pin) - (47uF/16v) - (5pin)
I googled and figure out 'Relay protection circuit' or 'Coil reverse voltage' is the reason
but i don't know what i have to do.
so i want down LM7805's temperature. (I want fixed 5V out for Atmega328p)
1. If there is asolution without heatsink what is that?
2. sould I use LM2576?
I wan study electronics with AVR(now atmega328) but there is no community in my country...
I have heat issue with LM7805. Here is my circuit
If relay on, LM7805's temperature rises over 50'C (24v 3A)
but relay off, LM7805's temperature under 40'C (about 37'c)
I tried
1. SW1 - Diode - Relay
(3pin) - (1N4148) - (5pin)
2. Relay - Diode - Relay
(2pin) - (1N4148) - (5pin)
3. Relay - Capaciter - Relay
(2pin) - (47uF/16v) - (5pin)
I googled and figure out 'Relay protection circuit' or 'Coil reverse voltage' is the reason
but i don't know what i have to do.
so i want down LM7805's temperature. (I want fixed 5V out for Atmega328p)
1. If there is asolution without heatsink what is that?
2. sould I use LM2576?