Mixer with optional offset function and inverted/non-inverted outputs Inputs J1 ... J3 are standard inputs. Input J4 has offset function provided that no plug is inserted into J4 as the switching contact of J4 is connected to the positive supply voltage in this case (via the protection resistor R8). At J5 the inverting sum of all inputs is available. J6 outputs the non-inverting sum. P5 allows an additional attenuation of the complete signal (affects only J6). Typical values for the parts used: O1, O2 = LM1458, TL082, NE5532 P1...P4 = 47k linear (CV) or log (audio) R1...R7 = 100k (for overall amplification 1) To obtain a higher overall amplification R5 has to be increased (e.g. to 220k for overall amplification ~ 2 or to 1M for overall amplification ~ 10). The value of R8 defines the offset range (about 0...+6V for R8=33k, a lower value of R8 will increase the offset range and vice versa). |
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