Neon Indicator lamp replacement

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SUMMARY

The discussion focuses on replacing a neon indicator lamp in an old flash gun with an LED. The original lamp operates between 240V and 350V and is connected in series with a 1.5GΩ resistor across a charged capacitor. The user seeks a minimal circuit solution for the LED replacement, considering the power source from a 4AA battery pack, which can function down to 4.8V. A reference resource for strobe flash repairs is provided for further guidance.

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  • Understanding of basic electronics, including voltage and current concepts.
  • Familiarity with LED specifications and circuit design.
  • Knowledge of resistor values and their impact on circuit functionality.
  • Experience with rechargeable battery systems and their voltage characteristics.
NEXT STEPS
  • Research LED driver circuits suitable for high-voltage applications.
  • Learn about resistor-capacitor (RC) timing circuits for indicator applications.
  • Explore the use of zener diodes for voltage regulation in LED circuits.
  • Investigate the design of low-voltage LED indicators for battery-powered devices.
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Electronics hobbyists, circuit designers, and anyone interested in modifying or repairing flash photography equipment.

dzhangg
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I have this neon indicator lamp that I would like to replace with an LED. It is a part of an old flash gun.
The indicator is made to show "charge complete" and I've measured that to start from 240V and keep going until maybe 350V. The indicator lamp is connected in series with a 1.5Gohm resistor and the whole thing is connected across the charged capacitor.

There's 4AA voltage within the pack which I could use, but i use rechargeable batteries, so it should work down to 4.8V

What's the smallest circuit I could get to replace this with an LED?
 
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