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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: I need to calculate the value of a voltage dropping resistor posted by drsx on October 12, 2016 at 09:57:42:
If B+ of 300V is supplying the 250V zener string, that's only 1.2 X the zener voltage. A larger margin is needed for the zener to operate properly. X 1.3 or more is the rule of thumb, 330-350V is a more suitable source.
If the zener is set to 10 mA and supplies a grid drawing up to 7 MA, it shares almost even current with the load and will not regulate well at all. The situation looks worse when the grid draw varies with signal. To give adequate regulation, a simple zener regulator should draw 10 X the max. load current, or 70 mA. This regulator works best under a very small, constant load.
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- RE: I need to calculate the value of a voltage dropping resistor - Lois 17:36:06 10/12/16 (0)
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