In Reply to: Re: Will the real RIAA please stand up? posted by Jim Hagerman on May 29, 2002 at 22:32:49:
The site has the information in a pretty easy to use format. I plugged in the "standard" RIAA values from that page and got values that are not standard. I will try again with some different capacitor values and see if standard resistor values come out.
I had thought that the values would be standard so as to make it easy for manufacturers to implement the curve easily.
Sorry. The values are optimal (but may not exist). Then you have to choose the closest available 1% resistor value. At the bottom of the page is a table to pick from.
It would have taken too much work in software to do this for you. Ok, maybe not. There is probably some formula they are based on, like 1/96 times something...
The 2 Pi Radians answer below should be below Mark Kelly's comment. It has nothing to do with Mr. Hagerman's comment. Sorry for my confusion.
You know I asked what that (2Pi Radiran) means about 22 years ago. So... If I have this correctly, if the time=1/2PiF and Fo=1/2PiRC then RC is also equal to the time constant. I.E. I want a resistor and capacitor that when multiplied together give 3180X10-6?
The only point I am hazy on is whether the 50, 500 & 2120 Hz points are the 3dB down points calculated with the F0=1/2PiRC equation.
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