Hi everyone,
I'm a 1st year student in an engineering technology program and recently learned about voltage regulators, and decided to build a circuit of my own, to function as a USB charger in my car, just for fun!
I used an LM7805 typical regulator for 5v, a 330pf and 100pf pair of capacitors to filter. The circuit worked fine when I was testing it out, I was charging my cellphone for a while. But last night I installed it in my car, and it worked for a couple of minutes and then stopped working, I pulled it out and checked it over, and noticed the Vout was hovering around 10.5 to 11.0V when running off my 14V supply.
I am stumped as to what is going on, did my cellphone draw too much current and fry the regulator?
I'm a 1st year student in an engineering technology program and recently learned about voltage regulators, and decided to build a circuit of my own, to function as a USB charger in my car, just for fun!
I used an LM7805 typical regulator for 5v, a 330pf and 100pf pair of capacitors to filter. The circuit worked fine when I was testing it out, I was charging my cellphone for a while. But last night I installed it in my car, and it worked for a couple of minutes and then stopped working, I pulled it out and checked it over, and noticed the Vout was hovering around 10.5 to 11.0V when running off my 14V supply.
I am stumped as to what is going on, did my cellphone draw too much current and fry the regulator?