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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