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Success Stories If you have successfully repaired or restored a piece of equipment, why not write up what you did and post details here. Particularly if it was interesting, unusual or challenging. PLEASE DO NOT POST REQUESTS FOR HELP HERE!

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Old 4th Jun 2019, 9:42 am   #1
ThePillenwerfer
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Default Old Drydex Torch with Replica No 8 Battery and LED.

Recent threads prompted me to fix this old torch up. I made a No 8 battery using two N cells. As these would have a lower capacity than a pusser No 8, though being alkaline the difference may not be as great as it would first appear, I wanted them to last. I therefore soldered a 10mm white LED to an old MES base and used that as a lamp. As this is only working on 3V it is drawing a mere 30mA but is still plenty bright enough, ie painful to look at.
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Old 4th Jun 2019, 1:32 pm   #2
llama
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Default Re: Old Drydex Torch with Replica No 8 Battery and LED.

Great result!
Any series resistor to limit/control current through the LED?
Graham
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Old 4th Jun 2019, 2:10 pm   #3
paulsherwin
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Default Re: Old Drydex Torch with Replica No 8 Battery and LED.

The internal battery resistance will limit the current at that voltage.
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Old 4th Jun 2019, 2:53 pm   #4
ThePillenwerfer
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Default Re: Old Drydex Torch with Replica No 8 Battery and LED.

No resistor. Those LEDs should have 3.4V so even with fresh alkaline cells it's below that. The rated current is 150mA but even at a fifth of that it gives well over half the light it would at full power; it's certainly as bright as a tungsten lamp would be.
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Old 8th Jun 2019, 7:53 am   #5
Kevin Hoyland
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Default Re: Old Drydex Torch with Replica No 8 Battery and LED.

Hello Joe.
Keep the good work up.
Kevin.
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Old 10th Jun 2019, 10:09 pm   #6
Phil G4SPZ
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Default Re: Old Drydex Torch with Replica No 8 Battery and LED.

Brilliant - literally!
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