Hey,
So I'm going though an analysis for this guitar effects circuit: http://www.geofex.com/article_folders/tstech/tsxtech.gif
Looking at the input buffer section, I'm trying to reverse engineer the corner frequency for the high pass filter. I realise that spice/qucs will tell me in about 10 seconds that the Fc is about 15.5Hz (and also that the 1k resistor is small enough to ignore and use 1/2∏RC), but I'm trying to do it by hand, because I feel like it would help me understand things better, and be a more efficient designer.
Could anybody help me through where I'm missing something (or maybe I just need to push through the calculus to solve it, but still..) in order to calculate the Fc for the information given? I think the reason I'm getting stuck is because I know that I need a magnitude of 0.707 V (assuming a 1V input), but I don't know what the phase angle will be, so I can't solve it that way!
I know that the total impedance (in kohms) Zt= 511 + Xc j, but I don't know how to get this into polar form (or at least a workable polar form).
I'm thinking that there is probably a really obvious way to solve this that I'm gonna kick myself for, but I can't work it out!
Thanks in advance
Ben
So I'm going though an analysis for this guitar effects circuit: http://www.geofex.com/article_folders/tstech/tsxtech.gif
Looking at the input buffer section, I'm trying to reverse engineer the corner frequency for the high pass filter. I realise that spice/qucs will tell me in about 10 seconds that the Fc is about 15.5Hz (and also that the 1k resistor is small enough to ignore and use 1/2∏RC), but I'm trying to do it by hand, because I feel like it would help me understand things better, and be a more efficient designer.
Could anybody help me through where I'm missing something (or maybe I just need to push through the calculus to solve it, but still..) in order to calculate the Fc for the information given? I think the reason I'm getting stuck is because I know that I need a magnitude of 0.707 V (assuming a 1V input), but I don't know what the phase angle will be, so I can't solve it that way!
I know that the total impedance (in kohms) Zt= 511 + Xc j, but I don't know how to get this into polar form (or at least a workable polar form).
I'm thinking that there is probably a really obvious way to solve this that I'm gonna kick myself for, but I can't work it out!
Thanks in advance
Ben