AC Power RC series circuit low pass filter, find frequency given gain.

[dfs730]

1. You have a series circuit consisting of a ac power supply, a 600 ohm resistor and a 73 nF capacitor.
If the circuit is configured as a low pass filter, what frequency will cause the gain to be 0.25?

2. If the circuit is configured as a high pass filter, what frequency will cause the gain to be 0.25?


Vout/Vin = R / (R^2 + (1/ωC)^2)^(1/2) low pass filter


Vout/Vin = (1/ωC) / (R^2 + (1/ωC)^2)^(1/2)


I tried to sub in for R,C, and gain (Vin/Vout) and got 5895 Hz for #1 and 88424 Hz for #2

any suggestions?

 

[gneill]

Check your RC layout for the low pass filter. The capacitor should be in a position to short out high frequencies, and allow low frequencies to pass.