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RE: Quickie done quick (with errata)

Hey, it's cheap - give it a try!

The normal cathode resistor is 1K with 2mA current, so 2 volts with fresh batteries. A normal red LED is around 1.8 volts, so that looks good. The fixed voltage means the bias won't decrease when the battery voltage falls. On the one hand the battery current will reduce faster as the battery runs down (longer life), on the other hand the tube's operating point will wander off optimum more quickly as the battery voltage falls (shorter life). No idea which trend will win out...


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