LM7805 Making Cellphone shut down

Thread Starter

imzack

Joined Nov 3, 2010
73
Ok, im trying to make a cellphone charger from a batterypack, i have 7.2 volts going into my lm7805, I wired it up correclty i believe. I think attach the Vout and the ground to my cellphone wires, i hook the cellphone cable to my phone.

Once i do this, the cellphone turns off and the LM7805 got SUPER hot, i unplugged it, assuming its getting too much current for some reason.

Does anyone have any idea why this is happening?


Any suggestions?


Thanks


Zack
 

Thread Starter

imzack

Joined Nov 3, 2010
73
no, I have 18, 1.5 volt cells. 3 strands of 6. so 6 batteries in series giving me 7.2 volts and three of these in parallel.

ill see about a schimatic
 

Thread Starter

imzack

Joined Nov 3, 2010
73
.33 micro farads electrolitic cap, and a .1 micro ceramic(on the out end)
um no heat sink, it turn the phone off immediatly though

and the ic ive double checked.... looks good to me...
 

nerdegutta

Joined Dec 15, 2009
2,684
Have to ask, but have you checked for shorts, solderblobs and stuff like that. I suspect there is a short somewhere. How's the cable you connect to the phone?
 
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