[Kenwood] Dial Light

[David C. Hallam]

Just to let everyone who might be interested know, All Electronics Corp. 
  Has T1 14V 40mA bulbs listed on their web site at 3 for $1.

David
KW4DH

Bryan Swadener wrote:
> David KW4DH wrote:
>> What is the bulb used behind the frequency dial on a
>> VFO-120.  The 
>> manual has no bill of materials and the schematic refers to
>> it only as a 
>> pilot light.
>>
>> David
>> KW4DH
> 
> 
> Clif KA5IPF wrote:
>> 12v 40ma Grain of wheat.
>>
>> Clif Holland KA5IPF
>> www.avvid.com
> 
> IIRC, they're a 'T1' bulb size.  A well-stocked model supply store will have them.  Some will have bulbs rated at 14V.  These will last a lot longer than ones rated at 12V (when using a 13.8V supply).
> 
> Another idea is to use 12V bulbs with a series current regulator IC (LM317LZ + one resistor) to limit the cold-start current.  The resistor sets the current limit point.  If you choose a current limit less than the hot current of the bulb, it'll last longer than the typical 10,000 hours.  Yeah, GOW bulbs are cheap but sometimes they're a PITA to replace.  The LM317L datasheet on National's website shows how to select the resistor.
> 
> vy 73,
> Bryan WA7PRC
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