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This pre amp is a simple opamp preamp that consists of a buffer stage, a resistor ladder as volume attenuation, another buffer, then a balanced line driver. The buffer used are LME49720, a high performance dual opamp from National. The balanced line driver is Burr Brown OPA1632.
The input impedance is setup via R1 and R3, which is 470k. The buffer gain is determinded by R5, R6 and R7 . Buffer gain = (1+2*R5/R6). (note : R12,R13 and R14 for the second buffer). The gain of the fully differential opamp OPA1632 is R17/R15.
In my setup, each buffer gain is set to 2, while the differential opamp gain is set to 1. So the total gain of this preamp is 4. (+12db)
This preamp board can be used for single ended input/output. When used for single ended input, only connect the single + signal to the in+. The in- should be grounded. For single ended ouput, only use the out+ signal. |
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