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Deflection amp for consideration (see schematic @ ABSE)

Discussion in 'Electronic Design' started by Tim Williams, Sep 5, 2007.

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  1. Tim Williams

    Tim Williams Guest

    I think I've got the key bits in there... like the common mode feedback the
    right way around.

    It's a diff amp, but most scopes have a SE front end. So, like most scopes,
    the position knob goes to -in and signal to +in. A preamp might be a good
    idea for the more sensitive ranges.

    The 2N5179 pair should be fast enough that I get the ~20 gain I want up to
    50MHz or so. '3904's are kind of pokey for this, but as emitter followers,
    who cares. That just leaves the hope that the C1569's are as fast as
    claimed. Overall, I should have enough current flowing to reach within a
    few clicks of fT. But what do I know, I haven't built a wideband circuit
    like this before...

    And if not, I could replace the bastards with a 6CL6. That'll show 'em.

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