Of all the voltage regulator ICs, the 78xx family is by far the most established. Not surprisingly! It’s difficult to get performance this good with so few outside components necessary.
power supply with 7805,7806,7809,7810,7812 at 5A circuit
Just like the famous LM317, the 78xx family incorporates automatic shutdown in case of overheating. You can get up to 1.5A of current with a suitable heat sink. No fuse is required.
Problems:
Observe all the safety precautions when dealing with mains powered circuits.
Possible uses:
A regulated power supply for any application.
2 Responses
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we had to make 5 volt DC power supply as a college project,and in that we had to use IC 7805 along with a centre tap transformer of o/p voltage as 5 volt (5-0-5) . But due to “practical problems” now we have 9 volt centre tap transformer! can we use the same IC? (7805) and get same output? or should we use IC 7809? BUT then the o/p would be 9 volt right?
do not wory about the transformer voltage. Input voltage of 7805 vould be 10-40V peak. therefore just increase the value of the resistor between the rectifier diodes and 7805 in only. your output does not follow input voltage. It stays at 5Vdc. More important point that electrolitic capacitor voltages should be at least equal to minimum 1.41*Supply voltage.