two-digit display

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A project that includes a stage with three selectable gains (0.1, 1.0, and 10) requires that the rotary-gain switch also function to illuminate one of three LEDs. These panel-mounted LEDs serve to indicate the gain in use. This arrangement requires two switch sectionsone for selecting the op amps gain-set resistor and one to light the corresponding indicator LED. The circuit in Figure 1 requires only one more switch section to provide a true, two-digit, seven-section numeric LED display. The circuit needs no active driver-decoder circuitry.The two switch sections for the numeric readout and the section for choosing the op amps gain-set resistor are combined in one common three-position, three-pole rotary switch. This configuration uses a common-anode pair of seven-segment display di visit page.

The two switch sections for the numeric readout and the section for choosing the op amps gain-set resistor are combined in one common three-position, three-pole rotary switch. This configuration uses a common-anode pair of seven-segment display di http://www.edn.com/archives/1995/122195/26di2.htm

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