- #1
foobag
- 75
- 0
http://img683.imageshack.us/img683/5329/unledtw.png
So its basically a power supply with a voltage regulator LM317T at the end.
The question asked to find the voltage ripple across the capacitor.
So I basically solved the peak voltage found which would be 12V * SQRT(2) = 17 volts.
and because of the diode bridge rectifier, 1.5 volt would be lost, so like 15.5 volts would go across the capacitor and eventually the LM317.
Now my question is how do I solve for the voltage ripple. I understand since this is a full wave rectifier, I should use 120 Hz instead of the 60Hz.
I found an equation as Vr = I / (2fC), where I is the current going into the capacitor? and another equation Vr = Vp / (R_load * C), where Vp is the peak voltage.
Could someone help me out and guide me through the problem?
So its basically a power supply with a voltage regulator LM317T at the end.
The question asked to find the voltage ripple across the capacitor.
So I basically solved the peak voltage found which would be 12V * SQRT(2) = 17 volts.
and because of the diode bridge rectifier, 1.5 volt would be lost, so like 15.5 volts would go across the capacitor and eventually the LM317.
Now my question is how do I solve for the voltage ripple. I understand since this is a full wave rectifier, I should use 120 Hz instead of the 60Hz.
I found an equation as Vr = I / (2fC), where I is the current going into the capacitor? and another equation Vr = Vp / (R_load * C), where Vp is the peak voltage.
Could someone help me out and guide me through the problem?
Last edited by a moderator: