Thanks!Ross Robotics:
It’s ok just to approve them.
EDIT: Gerber files generated and sent out to PCB house. Should get the board back in 3-4 weeks for testing. Thanks everyone for your help!
PCB back from China - how does it look?
Except fort he silkscreen mishap on the lower right, looks good.
Yeah, even though I used the Mirror to flip it to the bottom silkscreen, it somehow ended up on the top. Fixed that just now, along with the two diode outlines that are on bPlace instead of tPlace.Ross Robotics:
Except fort he silkscreen mishap on the lower right, looks good.
I think I may have put the heat sink on the wrong voltage regulator …
I was thinking the motors would draw enough current that at 6V the 7806T chip would need to dissipate a fair amount of heat with a 12V supply, but it doesn’t even get warm to the touch. On the other hand, I have a 78L05 voltage reg to supply logic voltage to the PIC16F1825 as well as 20 LEDs that are connected externally (which is why they weren’t on my prototyping board and I didn’t even think about them until now that the whole thing is all assembled) which is getting blisteringly hot. I measured the current draw of the board and it’s around 300mA, which is more than 3 times what the 78L05 is rated for. So, even if I replace it with a 500mA or 1A version I think I still need to worry about the heat generated by the 7V excess (2.1W?).
Thoughts? Should I redesign the board to have a 7805 TO-220 pkg chip use the heat sink instead?
EDIT: Actually, with the two motors running the 6V voltage reg gets up to around 110 deg F. Definitely hot to the touch.