Lamp failure indicator (CB8384E)

This circuit indicates when a 28 V lamp burns, lighting a neon lamp with higher voltage. The circuit is from 1969 documentation.

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Photo Timed Voice Relay (CB16823E)
This interesting circuit, which can be used as an alarm, was found in a 1997 documentation. It...
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We found this circuit in the National Semiconductor FET manual. The components are calculated...
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The presented circuit is suggested by Texas Instruments (www.ti.com) in its Application Report...