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Converting from dot and bar indicators to other forms of readout. (1) Interface circuit allows a dot/bar display to be replaced by a numerical readout. Standing alone, it will also operate as a two-range, single-digit DC voltmeter. (2) Circuit converts a dot, bar, or digital display to a distinct audio tone which differs for each digit.
HANDS-ON ELECTRONICS Dec 1987 (v.4#12) pg. 93

Power supply for the filaments of fluorescent readouts eliminates expensive transformers and heat-generating dropping resistors.
POPULAR ELECTRONICS [1] Sep 1976 (v.10#3) pg. 102

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