In Reply to: Re: LED BIAS vs LEAD ACID BATTERY posted by dave slagle on October 26, 2001 at 09:30:30:
I'm planning to use batteries in the cathode to heat the filaments of a 2A3 (driver) and an 845 (output).
Is that not recommended in your experience ?I suppose I'll use 2 NiCd's =2.4V for the 2A3 and lead acid batteries for the 845. Not quite sure about the latter yet. I would need 5 cells for 5x2 = 10V. Can't quite get there with NiCd's as 8x1.2=9.6V.
The idea is to avoid almost anything (i.e. resistors, caps) between the filament and the ground.Should I use an equal number of cells on each side of the filament or should I put them all on one side ? i.e.
/\
| |
= =
| |or
/\
| |
| =
| |
?(hope this comes out ok..)
This is all for RC coupling between stages with fixed bias say.
If I go for direct coupling it will get more complicated. One idea would then be to use gas regulators (stacked for the 845) to achieve cathode bias. (Again then I wonder if I should use one on each leg or not.)It all sounds crazy - that's why I haven't done it yet..
Stelios
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Follow Ups
- BATTERY for filament heating - stelios 10:30:09 10/26/01 (14)
- Re: BATTERY for filament heating - dave slagle 11:22:26 10/26/01 (13)
- Re: BATTERY for filament heating - stelios 13:08:47 10/26/01 (1)
- Re: BATTERY for filament heating - dave slagle 14:15:06 10/26/01 (0)
- Re: BATTERY for filament heating - Paul Barker 12:21:38 10/26/01 (10)
- Re: BATTERY for filament heating - stelios 13:32:14 10/26/01 (9)
- Re: BATTERY for filament heating - dave slagle 13:57:35 10/26/01 (8)
- Re: BATTERY for filament heating - stelios 08:45:46 10/27/01 (0)
- Re: BATTERY for filament heating - Paul Barker 00:40:32 10/27/01 (5)
- Re: BATTERY for filament heating - dave slagle 15:22:33 10/28/01 (4)
- Re: BATTERY for filament heating - hifitom 22:03:33 10/26/01 (0)