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Choice of damping resistor....

will also determine equivalent input noise. So first choose the damping resistor (just it in shunt) and try to measure noise with the primary loaded with a 500 ohm resistor. You might have to resort to headphones with the volume tuned up and then sub resistors if you have no sensitive dbm meter. Just pick the resistor that offers lowest noise and then start trying caps calues with that resistor in series with the cap. The cap just tames the ringing. James


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