Chomsky Posted September 19, 2011 Report Share Posted September 19, 2011 (edited) When I connect 2 9Volt batteries to the PIC burner the 78L05 voltage regulator is heating up. I suspect that there is a short-circuit somewhere? Can someone tell me in what region on the burner the problem could be located? Edited September 19, 2011 by Chomsky Quote Link to comment Share on other sites More sharing options...
sidmonster Posted September 19, 2011 Report Share Posted September 19, 2011 When I connect 2 9Volt batteries to the burner the 78L05 voltage regulator is heating up. I suspect that there is a short-circuit somewhere? Can someone tell me in what region on the burner the problem could be located? You are regulating 18 volts down to 5! It doesn't surprise me that this generates heat. Why not try a battery or power supply that is closer to 5 volts? Quote Link to comment Share on other sites More sharing options...
Chomsky Posted September 19, 2011 Author Report Share Posted September 19, 2011 No. I'm talking about the burner module which gets 18 Volts. Quote Link to comment Share on other sites More sharing options...
nuke Posted September 19, 2011 Report Share Posted September 19, 2011 can u regulate the LM317 then? did u check with and without the 74hc14?...i remember a similar issue, and some of my 74hc14 was broken now, they both (lm317 and 78L05) get a bit warm but not hot on my board... @sidmonster : there´s need of about 12-13V to burn pics , therefore that amount of volt. Quote Link to comment Share on other sites More sharing options...
sidmonster Posted September 20, 2011 Report Share Posted September 20, 2011 can u regulate the LM317 then? did u check with and without the 74hc14?...i remember a similar issue, and some of my 74hc14 was broken now, they both (lm317 and 78L05) get a bit warm but not hot on my board... @sidmonster : there´s need of about 12-13V to burn pics , therefore that amount of volt. sorry, he said 7805 and that's a 5 volt reg, I'm not familiar with the pic burner... Quote Link to comment Share on other sites More sharing options...
Altitude Posted September 20, 2011 Report Share Posted September 20, 2011 what voltage are you getting at J2? Check and make sure +5 is not shorting to GND, it should not get that hot Quote Link to comment Share on other sites More sharing options...
Chomsky Posted September 20, 2011 Author Report Share Posted September 20, 2011 I found the problem. There was a bad soldering on the board. I corrected it but now I have another problem. Only the yellow LED is on. I measure 12 V at J2 and I have alredy bought new 74HC14 ICs. Quote Link to comment Share on other sites More sharing options...
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