tool49
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Total Posts: |  posted 06-30-2003 04:21 PM CST (US)   |  | 
After experimenting with the BUF634 and the A42, I found absolutely NO improvement to buffer this topology (this might be due to my setup or to the way I like my music, but still, nothing got better). So I would leave either the second opamp in the feedback loop of the first, or simply swap it for a BUF634, but not both the second opamp and the buffer together.The gain of that particular topology is 3. The calculation is quite simple: (R2 / R1) + 1. In this case (10000 / 4700) + 1 = 3.12. To get a higher gain, simply change either R1 or R2 to the value you look to get. For low impedance phones (16 to 32 ohm), 3 to 5 is good, for medium impedance phones (33 to 120 ohm), 6 to 15 is good, finally for harder to drive phones, 16 to 25 would be good. I suggest you use Tangent's calculator to find the appropriate resistor values: Electronic calculator Hope this helps! |
