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-   -   Old Drydex Torch with Replica No 8 Battery and LED. (https://www.vintage-radio.net/forum/showthread.php?t=157045)

ThePillenwerfer 4th Jun 2019 9:42 am

Old Drydex Torch with Replica No 8 Battery and LED.
 
3 Attachment(s)
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.

llama 4th Jun 2019 1:32 pm

Re: Old Drydex Torch with Replica No 8 Battery and LED.
 
Great result!
Any series resistor to limit/control current through the LED?
Graham

paulsherwin 4th Jun 2019 2:10 pm

Re: Old Drydex Torch with Replica No 8 Battery and LED.
 
The internal battery resistance will limit the current at that voltage.

ThePillenwerfer 4th Jun 2019 2:53 pm

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.

Kevin Hoyland 8th Jun 2019 7:53 am

Re: Old Drydex Torch with Replica No 8 Battery and LED.
 
Hello Joe.
Keep the good work up.
Kevin.:beer:

Phil G4SPZ 10th Jun 2019 10:09 pm

Re: Old Drydex Torch with Replica No 8 Battery and LED.
 
Brilliant - literally!


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