| Electronics > Beginners |
| Using schematic to calculate transformer windings. |
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| gkmaia:
First test with a new coil former. Just the primary and feedback to start with. Ratio seems to be working as predicted by our calculations at 1:~30/33 ration between the primary and feedback. In circuit there is oscillation now. But quite low at 100hz instead of 50khz and for that reason I believe, by being an HF transformer, my feedback output is quite under at 1:~90 ratio. Does it look like I should leave the transformer quiet for a while and look at Q454/C455 block and see if that is the cause of the low frequency? Also did some scans with 2,3 & 4 turns at the feedback winding. |
| T3sl4co1l:
I don't see any oscillation at 100Hz. I do see AM; I take it, your power supply unfiltered? Tim |
| andy3055:
By the way, what is the Tek part number of your transformer? |
| gkmaia:
--- Quote from: andy3055 on October 24, 2019, 11:33:05 pm ---By the way, what is the Tek part number of your transformer? --- End quote --- Is it 120-0997-000. --- Quote from: T3sl4co1l on October 24, 2019, 11:17:34 pm ---I don't see any oscillation at 100Hz. I do see AM; I take it, your power supply unfiltered? --- End quote --- Yes you are right... this is nothing more than a ripple that come from the mains transformer as it is a +120DC unregulated. My bad not seeing this. Any tips on why it is not oscillating? |
| T3sl4co1l:
It was oscillating at 4 turns? ??? Tim |
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