![]() To change the minimum and maximum value of bandwidth, the integrating capacitors, C3 and C12, can be scaled up or down. ![]() To ease the setting of this bandwidth sensitivity, a 1k potentiometer can be used to replace R1 and R2. The small deflection seen on the scope does not indicate signal level, but rather instantaneous bandwidth of the two filters it should not be interpreted as a signal-level. Adjust the values of R1 and R2 (their sum is always 1 k) to slightly deflect the scope trace. This can easily be done by viewing the capacitor voltage of pin 10 with an oscilloscope. To determine the value of R1 and R2 in a tape system for instance apply tape noise (no program material) and adjust the ratio of R1 and R2 to open slightly the bandwidth of the main signal path. ![]() The sensitivity resistors R1 and R2 may need to be switched with the input selector, depending on the noise floors of different sources, i.e., tape, FM, phono. ![]()
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