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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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4th Jun 2019, 9:42 am | #1 |
Octode
Join Date: Mar 2011
Location: Sheffield, South Yorkshire, UK.
Posts: 1,453
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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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4th Jun 2019, 1:32 pm | #2 |
Octode
Join Date: Jun 2006
Location: St Osyth, Nr Clacton, Essex, UK.
Posts: 1,482
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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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Half my stuff is junk - trouble is, I don't know which half! |
4th Jun 2019, 2:10 pm | #3 |
Moderator
Join Date: Jun 2003
Location: Oxford, UK
Posts: 27,939
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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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4th Jun 2019, 2:53 pm | #4 |
Octode
Join Date: Mar 2011
Location: Sheffield, South Yorkshire, UK.
Posts: 1,453
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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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8th Jun 2019, 7:53 am | #5 |
Heptode
Join Date: Feb 2009
Location: Rotherham, South Yorkshire, UK.
Posts: 559
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Re: Old Drydex Torch with Replica No 8 Battery and LED.
Hello Joe.
Keep the good work up. Kevin. |
10th Jun 2019, 10:09 pm | #6 |
Dekatron
Join Date: Apr 2005
Location: Bewdley, Worcestershire, UK.
Posts: 4,748
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Re: Old Drydex Torch with Replica No 8 Battery and LED.
Brilliant - literally!
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Phil Optimist [n]: One who is not in possession of the full facts |