In Reply to: Re: regulated screen supply posted by drlowmu on January 6, 2006 at 17:33:41:
Assume an output resistance of 5 Ohms of your complete tube regulator, this would means a time constant of 5x120us=600us. This means a corresponding frequency of about 300Hz! This means that the cap is working mostly in the domain above 300Hz and the regulator below 300 Hz. If I assume the cap to be a electrolytic one, not a very good idea! It is better to work with a small cap with a fast regulator with high internal feedback. The cap should work only in the domain above 40 kHz. A well done SS regulator should be fine. Noise isn't a problem, if the corner frequency is about 40kHz. Use a polypropylen and a ceramic cap in parallel.
This solution would be cheap and have to be considerd before using a lot of iron and huge caps.
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Follow Ups
- regulated screen supply - Meister 04:56:22 01/07/06 (5)
- Re: regulated screen supply - drlowmu 06:40:50 01/07/06 (4)
- regulated screen supply - Meister 11:22:30 01/07/06 (3)
- Re: regulated screen supply - drlowmu 12:56:30 01/07/06 (2)
- regulated screen supply - Meister 09:15:19 01/08/06 (0)
- And there has been some good discussion in this thread... - Mike Spence 15:15:11 01/07/06 (0)