Gravitywave homemade PCB power issues

[Riccardo Turacchio]

Hi guys! Not sure if this the right place to ask so ....I made an "adaptation" of the Gravitywave PCB for my CNC and assembled a couple of boards. Tested the various voltages without the ICs and i get everything more or less correct on the tl072 and lm324 with 8.70v but on the pt2399 0v!!
So I tested the 78l05 and I saw that nothing is coming out
So I took out a fresh one, tested 9v going in, 5v coming out
Replaced the one on the board with the fresh one and again 0v coming out so I assume something is frying the voltage regulator....
Anyone tried that PCB design?

 

[jimilee]

Is the regulator backwards?

 

[Riccardo Turacchio]

Well..I'm just following the the building doc, not so sure about the orientation...I could try but
The 5 v leg is going to the pt2399...so should be correct.....
I removed the 2nd 78l05 from the board and tested it and it was still working giving the desired 5v...so eventually was not fried (yet) but it gets extremely hot once I put it back on the board....

 

[jwin615]

Sounds like a short is overcurrenting it

 

[Riccardo Turacchio]

I had this suspect too...still checking the board for mistakes I could have made while I was converting the design in vector....maybe I missed some ground connections....tedious debugging on this homemade boards.....what I was thinking???