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What is B+ power?

Discussion in 'Electronic Basics' started by [email protected], Jan 17, 2005.

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  1. Guest

    what is b+ power?
    i can't find definition or origin of b+?
    please explain to me..
  2. Rodney Kelp

    Rodney Kelp Guest

    The B is from the 2 humps of the half wave rectifier.B+ uses the two
    positive cycles of the AC signal in a half wave rectifier. B- powersupply
    uses the 2 negative pulses of a half wave rectifier.
    A full wave rectifier flips the 2 negative going ac pulses to the + side
    using the full power of the AC signal for DC. A half wave uses only half the
  3. Andrew Holme

    Andrew Holme Guest

    B+ and B- were the high-tension (HT) supply used in thermionic valve
    radio equipment.

    A+ and A- were the filament (heater) supply
    C+ and C- were the grid bias
  4. The B battery supplied the high voltage for tubes in the early days.
    There really was a B battery, as there was an A battery for the filament.

    So "B+" became the label for the high voltage bus in equipment. It
    became so standard, that the term remained even when voltages got
    a lot less with solid-state equipment.

  5. JeffM

    JeffM Guest

    }A+ and A- were the filament (heater) supply
    }C+ and C- were the grid bias
    } Andrew Holme
    Sometimes called the "Plate supply".
  6. Miles Harris

    Miles Harris Guest

    Or the "anode supply voltage" in Britain. Typically several hundred
    volts upwards.
  7. Bob Myers

    Bob Myers Guest

    Nonsense. As was already correctly said elsewhere, the
    "B" designation dates back to the early days of battery-operated
    tube (valve) radios, in which the "B" battery was the plate (anode)
    supply. The "A" and "C" designations have long since died out,
    but for some reason you still will come across the "B+"
    designation used in many schematics, even those of fairly
    recent vintage.

    Bob M.

  8. John Larkin

    John Larkin Guest

    Except that the designations were originally for battery-powered
    equipment, with A, B, and C batteries, as others have noted.

    Besides, if we were dealing with voltage bumps, the positive would be
    the M supply, and negative would be W.

  9. krw

    krw Guest

    Right, the 'B' battery was typically 90v. The 'A' battery (1.5V)
    supplied the filaments and the 'C' the grid bias.
    You've never seen a 'C' battery?
  10. Bob Myers

    Bob Myers Guest

    the filaments and the 'C' the grid bias.
    Sure, but not on a schematic as the letter identifying
    a power supply.

    Bob M.
  11. krw

    krw Guest

    That's only because the few places there are grids, they're biased
    other ways. The 'C' battery remains, however. The 'A' has gone pretty
    much the way of the DoDo, though.
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