jhorapalok
New Member
I have made two variable dc power supply using LM 317. I made them on vero board and stripboard and both of them working perfectly.
Then i wanted to make them on pcb. I drew the schemetic on the copper side with the help of a marker pen (mirrored schemetic ofcourse!) and then etched the pcb by ferric chloride. PCB is ok but after connecting the parts the power supply is not varying. it is giving the highest output voltage. I checked and rechecked the circuit, everything seems to be ok but the power supply is not working. what is the problem? please help.
Then i wanted to make them on pcb. I drew the schemetic on the copper side with the help of a marker pen (mirrored schemetic ofcourse!) and then etched the pcb by ferric chloride. PCB is ok but after connecting the parts the power supply is not varying. it is giving the highest output voltage. I checked and rechecked the circuit, everything seems to be ok but the power supply is not working. what is the problem? please help.