In Reply to: RE: Quickie done quick (with errata) posted by Dyna Saur on September 27, 2009 at 13:43:48:
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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Follow Ups
- RE: Quickie done quick (with errata) - Paul Joppa 19:04:06 09/27/09 (4)
- RE: Quickie done quick (with errata) - Dyna Saur 18:47:58 09/30/09 (3)
- RE: Quickie done quick (with errata) - bainjs 03:21:38 10/03/09 (2)
- RE: Quickie done quick (with errata) - Dyna Saur 13:10:54 10/04/09 (1)
- RE: Quickie done quick (with errata) - bainjs 17:57:32 10/04/09 (0)