Dixon Systems NM-250 MKII Manuel du propriétaire télécharger pdf (Page 16)

Dixon Systems NM-250 MKII

Metering

The NM-250 MKII uses the LM3916N-1 monolithic integrated circuit to provide an

electronic version of the VU meter. The metering circuitry is on both the main PC board

and the PC board which mounts behind the front panel.

As seen in the schematic below, a 5532 is employed as buffers between the main

output amplifiers and the metering circuitry. Drive for the meters is controlled by the two

trim-pots located on the main PC board. The second 5532 op-amp is configured as

precision half-wave rectifiers. The timing of this circuit provides an average reading

meter.

When shipped, the unit is set so that 0 VU = +4 dBm.

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Dixon Systems NM-250 MKII Manuel du propriétaire Page 16