I built a simple 24 VAC to 5 VDC power supply using the following:
24 VAC 10VA wall wart.
583-RS101 1 amp 50v Bridge rectifier
L78S05CV 2 amp 5 volt regulator.
I have a 100uF 35 volt electrolytic cap across the output of the rectifier, properly polarized.
I have a 22uF 35 volt cap across the output of the regulator.
A single led with a 150 ohm resistor on the output of the regulator to indicate 5 volts ON.
I did put a small heat sink on the regulator, although it should not need it as of yet.
I let the thing sit ON over night and noticed that the regulator was really warm-hot. Not too hot to touch, but warmer than I thought it should be to just light an led. Are my caps the wrong size maybe?
Bob
24 VAC 10VA wall wart.
583-RS101 1 amp 50v Bridge rectifier
L78S05CV 2 amp 5 volt regulator.
I have a 100uF 35 volt electrolytic cap across the output of the rectifier, properly polarized.
I have a 22uF 35 volt cap across the output of the regulator.
A single led with a 150 ohm resistor on the output of the regulator to indicate 5 volts ON.
I did put a small heat sink on the regulator, although it should not need it as of yet.
I let the thing sit ON over night and noticed that the regulator was really warm-hot. Not too hot to touch, but warmer than I thought it should be to just light an led. Are my caps the wrong size maybe?
Bob