The DNR system should be switched from maximum bandwidth to nominal bandwidth with tape noise as a signal source. With C3 and C12 set at 0.0033 ♟, the maximum bandwidth is typically 34 kHz. because the bandwidth is inversely proportional to the capacitance, changing this 0.0039 ♟ capacitor to 0.0033 ♟ will change the typical bandwidth from 965 Hz–34 kHz to 1.1 kHz–40 kHz. To change the minimum and maximum value of bandwidth, the integrating capacitors, C3 and C12, can be scaled up or down. All drivers available for download have been scanned by antivirus program. To ease the setting of this bandwidth sensitivity, a 1k potentiometer can be used to replace R1 and R2. Use the links on this page to download the latest version of AR5523 drivers. 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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