초록 ▼

A circuit serves to illuminate appropriate light emitting diodes of a sequence to provide a bar graph type display of an analogue input voltage. The light emitting diodes are divided into sets with each set being associated with a respective signal processing element which may be a differential ampl

A circuit serves to illuminate appropriate light emitting diodes of a sequence to provide a bar graph type display of an analogue input voltage. The light emitting diodes are divided into sets with each set being associated with a respective signal processing element which may be a differential amplifier supplied with the analogue input voltage at one input terminal and a unique off-set voltage at the other. The signal processing elements handle respective contiguous ranges of the analogue voltage and the required supply voltage is reduced.

대표청구항 ▼

Analogue voltage display means comprising: an analogue voltage input for receipt of an analogue voltage signal to be displayed; a plurality of sets of light emitting diodes, said sets being together arranged to provide a display of a single sequence of light emitting diodes; a plurality of signal of

Analogue voltage display means comprising: an analogue voltage input for receipt of an analogue voltage signal to be displayed; a plurality of sets of light emitting diodes, said sets being together arranged to provide a display of a single sequence of light emitting diodes; a plurality of signal offsetting elements, there being one such element for each set of light emitting diodes, each signal offsetting element being connected with said input to receive the analogue voltage signal; offset voltage means supplying a different offset voltage to each signal offsetting element whereby the elements provide, over respective contiguous ranges of the analogue voltage signal, respective offset analogue voltage signals which are indicative of the analogue voltage signal to be displayed and which vary within voltage ranges which are similar as between the signal offsetting elements; and a plurality of control means, there being one such control means for each set of light emitting diodes, each control means being connected to receive the offset voltage signal from the corresponding signal offsetting element and comprising reference means which defines levels of the said offset voltage signal corresponding respectively with the light emitting diodes of the associated set and a semiconductor switch for each light emitting diode of the associated set, each semiconductor switch being actuable selectively to enable or inhibit current flow through the light emitting diode, the semiconductor switches for each set being respectively actuated as the corresponding offset analogue voltage signal reaches the levels defined for the respective light emitting diodes of the set, so that the light emitting diodes of the sequence are illuminated at unique levels of the analogue voltage signal to provide a visual indication thereof.