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Full wave, half wave?

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  • Full wave, half wave?

    In looking over some old schematics, I came across a very unusual configuration of the demodulation topology on a couple of White's circuits.
    The first was the 6000d series 2 and also the White's liberty 2.
    Can you say whether this is considered full wave? The way I see it, seems the opamp (filter on the 6000D) stage directly after the demodulation is being switched between inverting and non inverting topology, by successively pulling each input leg to ground, with each passing of the preamp sine wave positive and negative going sections. What say you?
    I've also included a simulation of a half wave active pull down switching arrangement using two jfets and a non bipolar transistor. This circuit comes from the first incarnation of the 6000D. Quite interesting little circuit, maybe it has utility in some other application.

  • #2
    Can't upload, having problem.

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    • #3
      Well, here is one.
      Attached Files

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      • #4
        Another.
        Attached Files

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        • #5
          Seems like I can only upload one at a time?
          Must be doing something wrong, says unable to upload, memory full....
          Attached Files

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          • #6
            Originally posted by dbanner View Post
            and a non bipolar transistor. .
            That should read "and a bipolar transistor"

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            • #7
              It's full wave. It's a switched-capacitor operation, where (referring to the Liberty) C7 is charged in a half-cycle and that charge is then used as a boost in the subsequent half-cycle.

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              • #8
                Originally posted by Carl-NC View Post
                It's full wave. It's a switched-capacitor operation, where (referring to the Liberty) C7 is charged in a half-cycle and that charge is then used as a boost in the subsequent half-cycle.
                Thanks for clarifying things. Seems that this configuration was short-lived and soon abandoned. Not seen it in any other subsequent designs whatsoever.

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                • #9
                  It was used for quite a few years actually. Probably it was a particular engineer who liked to use it. A similar design is currently used in First Texas designs.

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