Hello,
maybe somebody can help with this question. I found an article in Silicon Chip Silicon Chip Online - Regulated High-Voltage Supply For Valve Amplifiers where the old AT psu was modified to produce 400V high voltage for tube amp. The author has used the small current transformer for sensing primary current and therefore limit the current draw from secondary. In the schematic the T3 transformer is current sense transformer with the ratio 1:180, which reflects the primary side current 2V per amp. Its all understandable. What i dont understand, how the T3 transformer can be T2 transformer at the same time (on the picture) and use the same core which switches the output transistors? Shouldn´t the current affect the switching somehow? And sense the primary current also at the same time. Confusing....
I marked the transformer in red in schematics.
I actually built this unit and it works (mine is choozed 300V instead 400 or 700), but i really need some protection
Thank you in advance!
maybe somebody can help with this question. I found an article in Silicon Chip Silicon Chip Online - Regulated High-Voltage Supply For Valve Amplifiers where the old AT psu was modified to produce 400V high voltage for tube amp. The author has used the small current transformer for sensing primary current and therefore limit the current draw from secondary. In the schematic the T3 transformer is current sense transformer with the ratio 1:180, which reflects the primary side current 2V per amp. Its all understandable. What i dont understand, how the T3 transformer can be T2 transformer at the same time (on the picture) and use the same core which switches the output transistors? Shouldn´t the current affect the switching somehow? And sense the primary current also at the same time. Confusing....
I marked the transformer in red in schematics.
I actually built this unit and it works (mine is choozed 300V instead 400 or 700), but i really need some protection
Thank you in advance!