OK, but if it offers some improvement . that scope trace hows ringing on both edges of the square wave signal, which may be the problem. Certainly ringing is not what should be present. Before continuing I suggest adjusting the cope probe using the scope probe adjust source, to make sure that it is not a probe artifact. Then try a slightly larger cap in series with the resistor, 20pF or possibly 27pF, depending on what is on hand.
One other thought comes to mind is about the connection cable between the devices. Is that supposed to be 50 ohm coaxial and instead some high impedance microphone cable? The lower impedance higher capacitance cable may be the intended load for that driver device.
https://www.circuitspecialists.com/hp-9060.htmlI suggested trying a lightly larger capacitance since what I thought the response was is that it sort of worked with the first SERIES RC arrangement. My comment about the probe was related to setting the probe compensation capacitor adjustment. If that is not possible then please ignore that part of the comment.
So let me confirm :The first time suggested 10 Megohms and ten Picofarads, and the report was that part of it worked , in post #22. So next I suggested a eries connection, 10Megohms and 20 or 27pF, depending on which value of capacitor is most convenient. The mention about the cope probe was not part of the test.
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by Jake Hertz
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