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ESR Meter

Discussion in 'Electronic Design' started by Fred Bloggs, Jul 18, 2007.

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  1. Fred Bloggs

    Fred Bloggs Guest

    This meter patent filed around 1979 pre-dates Parker by quite a few
    years, and you can see from its write-up that the basic operational
    ideas have been borrowed: US4216424. Carl Vette put this into production
    with his Creative Electronics, and changed things a bit from his
    original application. The schematic, schematic write-up, and advertising
    lit with a picture of the meter can be found here:
    The circuit uses an interesting "peak-to-peak" detector among other
    things and looks more like a real design. Apparently Vette did a lot of
    consulting with local universities, contributing his expertise towards
    precision electronics fixturing for mostly biological research
    experiments- not bad for a repairman.

    A few years later Terry Cook patented US4795966 for Sencore, and this
    one looks a lot like the Parker meter.
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