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In Reply to: What is really going on...? posted by John Harper on March 11, 2000 at 09:36:09:
I think of it this way. A constant current source will flow exactly the same amount of current through it no matter how much voltage is across it. For example, it will flow 6mA with 100VDC across it, and it will also flow 6mA through it with 300VDC across it. Because of this its AC impedance is virtually infinity. I don't think of a CCS as being tight, I think of it as being infinitely loose to an AC signal. The CCS is not fighting the signal, it will completely allow the tube's cathode to move about without offering any resistance to movement.This circuit indeed hold constant current through the tube (until of course output grid current starts flowing) and also holds constant voltage across the tube.
With this SLCF circuit installed, putting 1.00 VAC on the grid will produce 1.00 VAC on the cathode, and the plate will follow with 1,00 VAC appearing on it also.
It really does hold the tube at a single operation point and makes a very transparent buffer.
Paul Speltz
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- This is how I think of it: - Paul Speltz 14:44:37 03/11/00 (0)
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