Timeline for Triode - how come grid is "more negative" than cathode?
Current License: CC BY-SA 3.0
6 events
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| Apr 7, 2017 at 9:43 | comment | added | Pentium100 | @emroe In that circuit, the resistance between the grid and cathode is quite high. In this case the tube develops "grid leak bias" - essentially, some electrons that pass trough the grid on their way to the plate impact the grid and make it a bit negative. This way you can get a small negative voltage on the grid. If your circuit does not need this, then you use a smaller resistance between grid and cathode. | |
| Apr 7, 2017 at 9:32 | history | edited | greg | CC BY-SA 3.0 |
Added explanations about the schema in the question
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| Apr 7, 2017 at 9:27 | comment | added | greg | I have augmented my answer. | |
| Apr 7, 2017 at 9:24 | history | edited | greg | CC BY-SA 3.0 |
Added explanations about the schema in the question
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| Apr 6, 2017 at 19:53 | comment | added | emroe | You are right, I misunderstand "zero voltage" as literal 0V on battery clip. While it's not. However in your example it's easy to see the cathode is not directly connected to GND. But how about this one? Common-Cathode Amp What makes the grid "more negative" than cathode, if cathode is literally connected to GND, which is the most zero point in the circuit? | |
| Apr 6, 2017 at 7:43 | history | answered | greg | CC BY-SA 3.0 |
