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Old 4th August 2007, 06:12 PM   #1
lgreen is offline lgreen  United States
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Default Lamp for Rod Elliott ESP#22 Wein Bridge Osc?

Hi, I am attempting to build the ESP Wein Bridge Oscillator (Project 22) which calls for:

"12V 50mA 'Grain of Wheat' lamps"

Looking for suitable lamps at Mouser, found this one (part 606-CM7219), 12V, 60mA (catalog page 94).

Anyone know if this is suitable, or if not, have a suitable part ##? I note that a digikey and mouser have a lot of lamps listed but many are not stocked or not available.
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Old 5th August 2007, 04:11 AM   #2
jaycee is offline jaycee  United Kingdom
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To be honest any 12v bulb with a 50mA or thereabouts filament should do. The bulb isnt actually used to illuminate anything, it's used as a temperature drift compensator.

"Grain of Wheat" lamps are also know as "midget" lamps.. and used to be used in telephones and the like.
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