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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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In Reply to: RE: I Made a Mistake Once... posted by Paul Joppa on September 8, 2014 at 08:41:06:
"The capacitor is charging because the diode in the bias supply prevents it from providing the current needed to discharge it."
Yes, but that doesn't mean grid current is coming from the bias supply. Just the opposite, in fact. When the capacitor charges due to grid current, it becomes more negative than the bias supply. No current flows from the supply when this occurs. If the diode is removed, current will actually flow *into the supply* as the capacitor discharges. In other words, when grid current is drawn, the bias supply is not required to deliver current, rather it is *fed* current from the bottom of the transformer winding. This means the power consumed by the grid - of which one component is grid current - is supplied entirely from the driver tube, not the bias supply.
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Follow Ups
- Current Flow - Triode_Kingdom 09:36:09 09/08/14 (3)
- RE: Current Flow - Paul Joppa 12:13:40 09/08/14 (2)
- Interesting Idea! - Triode_Kingdom 13:25:06 09/08/14 (1)
- RE: Interesting Idea! - Paul Joppa 18:58:36 09/08/14 (0)
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