| Electronics > Beginners |
| Using schematic to calculate transformer windings. |
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| gkmaia:
--- Quote from: T3sl4co1l on October 22, 2019, 08:51:49 pm ---It's a blocking oscillator, Q454 is actually going to control it (frequency modulation, sort of; more on that later). The feedback winding will be sized to give ca. 1-5V. Less and there's insufficient gain for hard switching, more and V_EB is exceeded, drawing bias current through that path, and Q458 literally beats itself to death (or until R458 fuses). --- End quote --- I finally managed to get it down to 50khz but needed to replace the the coil former. The 1st secondary outputs -126VRMS (factory is -120VRMS) The 2nd secondary outputs - 228VRMS (factory is -220VRMS) Haven't done the HV winding yet. If you look at WA00002 that is the feedback winding. It's -Vp is at 8v and seems ok. But the +Vp cannot pass +5v. Do you have any idea about what may causing that? |
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