it's a newbie question as I only study electronics and massing around with MCU for about 3 months
So I want to build a 5v regulated supply for my MCU, so I don't need to keep power it from battery when I learning
the chip I use is MC7805BTG
10uF 50V as input capacitor
330uF 25V as output capacitor
Green LED in series with a 1kΩ resistor as power on indicator
no heatsink
input: 18v 1.1A from an old printer adptor
after toasted 3 mc7806btg and 1 MCU (maybe some other component as well), I found out the regulator is too hot to touch only driving 5 leds (about 10mA per LED), while driving 4 LED is very warm
so what's have I done wrong? as I expect the regulator can handle 100mA to 200mA easily without heatsink
and it can provide 500mA and above with heatsink
So I want to build a 5v regulated supply for my MCU, so I don't need to keep power it from battery when I learning
the chip I use is MC7805BTG
10uF 50V as input capacitor
330uF 25V as output capacitor
Green LED in series with a 1kΩ resistor as power on indicator
no heatsink
input: 18v 1.1A from an old printer adptor
after toasted 3 mc7806btg and 1 MCU (maybe some other component as well), I found out the regulator is too hot to touch only driving 5 leds (about 10mA per LED), while driving 4 LED is very warm
so what's have I done wrong? as I expect the regulator can handle 100mA to 200mA easily without heatsink
and it can provide 500mA and above with heatsink