I took out the 7805 - > ic1 because i thought i might have fried it. The board powers on when there is usb but not when there is only 12 volts from screw terminals.
I then plugged in the board and did some tests...
1) from the 5v out pin and the ground pin im getting 0.5V (by pin, i mean pin slot, as in where the 7805 would actually go into the board, im just going to call it pin.)
This is my first question... shouldn't it be 0 volts when the regulator is not in the board ? where is the 0.5 coming from?
2) from the V in pin to the ground pin im getting like... a degrading voltage that starts at something like 4 volts and decreases. I was expecting 12 volts here... but from the v in pin to the ground at the screw terminal it IS 12 volts. It should be the same between the vin pin and the ground pin right ? I tested continuity and it beeped when i put my tester from the ground pin to the ground screw, so I dont see why the voltage reading would be different from vin pin to ground pin, and vin pin and ground screw terminal ! actually, its the SAME degrading voltage level from vin pin to ground pin and v in pin to the v out pin...
Can someone shed light on this ? thats my second question.
3) from the Vinput pin to the + 12 screw terminal, im getting 7.2 volts... shouldn't it be 0 ??????
my hope is that if i change the 2 capacitors and the voltage regulator that the circuit would work, but these readings are making me confused.
yeah... I accidently put the board ontop of shavings of coppor on my work bench, which shorted it when i powered it on... I dont see any burn marks or anything. I thought it was the regulator because when I originally tested the voltage expecting +5 coming out I only saw something like 0.5 or around there.
please help
I then plugged in the board and did some tests...
1) from the 5v out pin and the ground pin im getting 0.5V (by pin, i mean pin slot, as in where the 7805 would actually go into the board, im just going to call it pin.)
This is my first question... shouldn't it be 0 volts when the regulator is not in the board ? where is the 0.5 coming from?
2) from the V in pin to the ground pin im getting like... a degrading voltage that starts at something like 4 volts and decreases. I was expecting 12 volts here... but from the v in pin to the ground at the screw terminal it IS 12 volts. It should be the same between the vin pin and the ground pin right ? I tested continuity and it beeped when i put my tester from the ground pin to the ground screw, so I dont see why the voltage reading would be different from vin pin to ground pin, and vin pin and ground screw terminal ! actually, its the SAME degrading voltage level from vin pin to ground pin and v in pin to the v out pin...
Can someone shed light on this ? thats my second question.
3) from the Vinput pin to the + 12 screw terminal, im getting 7.2 volts... shouldn't it be 0 ??????
my hope is that if i change the 2 capacitors and the voltage regulator that the circuit would work, but these readings are making me confused.
yeah... I accidently put the board ontop of shavings of coppor on my work bench, which shorted it when i powered it on... I dont see any burn marks or anything. I thought it was the regulator because when I originally tested the voltage expecting +5 coming out I only saw something like 0.5 or around there.
please help