|
Simple max. 6 Watt HV power supply circuit. Correction to the video: when I say that the plate current has to be regulated or added slowly to the tube, I mean: the plate voltage. Because of the fact that a variable high voltage (60-300V) power supply is not easy to make, I use this circuit with a voltage doubler and a variable power (series) resistor in the supply lead. When we consider that each electron tube has an internal resistance between the anode and the cathode (when the filament is heated and electrons move), it is possible to change the anode (plate) voltage by changing the supply current (voltage divider theory). The good thing from this circuit is that, when you make mistakes in your tube circuit, the voltage collapses to (approx.) the AC secondary voltage from the transformer. So in a certain sense this power supply is safe and cannot be overloaded, only in extreme situations (series resistor to zero and output shortcut). But even for a short time it is possible to shortcut the output (tested). This depends for a great deal on the power from the used transformers (here approx. 6 Watt). More circuits in my books, available on the Lulu website (author Ko Tilman). Also the AC voltage (current) can be regulated because the potentiometer is first connected to the AC output. |
Views:
6
6
ratings |
