ATI Technologies SUM100 유지 관리 매뉴얼 - 페이지 2

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DESCRIPTION

The SUM100 Summing Amplifier is an inexpensive, high performance amplifier

that is designed as a line level stereo to mono summing amplifier. It is also useful

as a gain block, and as an impedance converter and summing for IHF (RCA

type) signals.

The inputs provide balanced 40Kohm bridging impedance for line levels up to

+24dBm. The high input impedance allows the SUM100 inputs to also bridge -

10dBu (hi-fi, RCA plug) lines without loading.

Front panel, screwdriver adjust, full range gain controls provide 26dB gain at full

clockwise rotation, unity gain at twelve o'clock and a smooth audio taper to full

off. The output driver is a servo controlled, ground-sensing circuit, which will

supply over +22dBm to 600 ohm balanced loads and +20dBu to high impedance,

unbalanced loads. The SUM100 uses rugged XLR type input and output

connectors.

Loop-through DC connectors allow several NANOAMPS to share a single

external 24VDC power supply. Battery packs and DC-DC converters for portable

use are also available.

Up to three amplifiers will mount side-by-side in only one rack unit using the

available rack mounting kits. NANOAMPS may also be neatly stacked or

mounted side by- side on your desk with the available angled desk mounting kits.

CIRCUIT DESCRIPTION

INPUT STAGES

The balanced input stages of the SUM100 Line Amplifier utilize a FET input

LF347 quad op-amp in a clean, quiet inverting instrumentation amplifier

configuration. Input levels up to +24dBm will be handled without clipping, excess

levels cause only clean clipping without hang-up or phase reversal. Equal -6dB

gains from both HI and LO inputs allow unbalanced sources to be easily

accommodated. Bridging impedance is a high 40Kohms with good CMR. Linear

panel adjust trimpots for both left and right signals are designed to be operated at

their 12 o'clock position for maximum resolution.

SUMMING AMPLIFIER

Left and right signals are combined in an active summing network (A1B) which

yields unity gain for each individual signal, three dB gain (RMS summation) for

program audio signals and six dB gain for correlated inputs.

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