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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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I am thinking of trying a "cheap red LED" for cathode bias, below a 12AY7 that will be conducting only 1 or 2mA of cathode current. I have read here and elsewhere that LEDs only work well if they are passing at least 10mA. Can I run a resistor from B+ to the anode of the LED, to augment the current it receives from the cathode? For example, a 30K resistor in series with a 300V supply will give me an additional 10mA. Is there anything wrong with that idea? Thanks.
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Topic - current through LED for cathode bias - Lew 10:41:06 06/25/12 (14)
- RE: current through LED for cathode bias - John Swenson 17:34:57 06/27/12 (2)
- RE: current through LED for cathode bias - Stephen R 07:24:33 07/01/12 (0)
- RE: current through LED for cathode bias - Lew 06:42:59 06/28/12 (0)
- Removing the mystery ... - Naz 17:49:14 06/25/12 (3)
- RE: Removing the mystery ... - Lew 18:59:54 06/25/12 (2)
- RE: Removing the mystery ... - Naz 19:42:58 06/25/12 (1)
- RE: Removing the mystery ... - Lew 21:06:26 06/25/12 (0)
- RE: current through LED for cathode bias - Paul Joppa 14:58:56 06/25/12 (2)
- RE: current through LED for cathode bias - Lew 15:31:28 06/25/12 (1)
- RE: current through LED for cathode bias - Paul Joppa 20:29:01 06/25/12 (0)
- RE: current through LED for cathode bias - Palustris 14:27:46 06/25/12 (1)
- RE: current through LED for cathode bias - Lew 14:47:47 06/25/12 (0)
- A couple of considerations.. - bwb 11:40:09 06/25/12 (1)
- RE: A couple of considerations.. - Lew 12:12:57 06/25/12 (0)
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