hey bro i check the fuse switch and power supply and all its good but the circuit. cannot turn all the led? and may voltage regulator heating so much this is possibly a shortage?. sorry this is my first time. learning about electronicsPower dissipated as heat = (Input Voltage - Output Voltage)* Current.
No other reason.
Yes sir i send a picture laterLooking at the circuit (quite a complex pcb for a beginner) it has 12v AC transforme/bridge/2200u combo feeding the 7805 with approx 16v . On the output 2 X 555, 7474 dual jkff, 2 X 7447 decoder, 2digit 7seg display with 330ohm resistors, and 10 LED on 150ohm resistors. Max current draw if all are on is <400mA, but would typically be ~100mA (5 IC @ 5mA, 7 segments on @ 10mA)
7805 running withtypical push-on heat-sink dropping 11v@100mA would be warm to touch ~ 50degC but OK, at 400mA would be hot >100degC.
I'm guessing there's an assembly fault somewhere, but not a complete short probably. Chip in socket backwards? Solder bridge?
@ferdz have you fully checked every part is in correctly and there are no solder bridges where there should not be?
Maybe post some good hi-res pictures of both sides of your board.
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