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In Reply to: Re: Will the real RIAA please stand up? posted by Jim Hagerman on May 29, 2002 at 22:32:49:
Jim,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.
Go figure?
Follow Ups:
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...
jh
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.Grainger
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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