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Hi
Aha!
Due to the excessive sun the last few days I had the transformer primary and secondaries swapped over (in was out).
Now it gets more interesting.
With a 10K load we have a 4 dB peak at about 120KHz. Now the interesting bit.
Without the capacitors (so the source impedance is 150 Ohms resistive) the response at LF is showing a slight fall at 10Hz (about 0.25dB). This is expected.
With 100uF we get a 1dB RISE at 10Hz.
With 50uF (as proposed by Tim 2 X 100uF in series) we get a rise of nearly 2dB at 10Hz.
The transformer is resonating.
Matt S
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