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What is a panaplex display?
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A panaplex display is a segmented display that uses neon gas discharge to make the segments glow under a high voltage. The voltage used is usually somewhere around 185 volts DC, with each segment getting a resistor to limit current to it.
A word of warning: Mishandling the high voltage line can lead to fatal injuries. Replicate any circuit with this display type at your own risk.
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Can panaplex displays operate at lower, safer voltages?
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No. You must use between 170 and 210 volts DC, much like with a nixie. Like with a nixie supply, never let anyone under 14, over 50, or with a heart condition handle high voltage.
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How would I go about getting a number to light in one of these displays?
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You will need to connect the common terminal of the display to +185 volts, first off. Then to control which segments light, use MPSA42 high-voltage transistors to control the segments from the IC of your choice, be it a TTL 74LS48 or CMOS CD4511. Use the appropriate segment and transistor base resistors in the circuit to prevent damage to the components. Then just wire up the IC and you should see a number glowing in the display.
WARNING! Do not touch any connections near the display while the circuit is live.