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Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
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Posts: 1735
they're really only conducting in one direction, the other half of the AC cycle is going to depend on the capacitor and how "leaky" or how lightly biased the diodes are. One half of the cycle they will conduct more because you are conducting current in the same direction, but the other half of the cycle you are conducting less current.
Try an experiment, a small current meter in series with the drain, and vary the input voltage from 1V to 0 to -1V and you will get the expected current fluctuation in the drain. From there you could find out what portion of the AC cycle the capacitor is contributing to the amplifier, it will be "active" when DC current is minimum or zero.
Your current probably goes to zero in a very small window about the negative peak, maybe 30 or 45 degrees of the conduction cycle, and symmetrical about the peak, it would be neat to see it plotted out, but I know that can be a bit of effort, and this is just me speculating.
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Ash Small's Rule.....Regarding JFET's
