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Circuit Bench

  • Busy Line Indicator (CB12442E)

      We found this circuit in a 1991 publication. It indicates when an analog phone line is busy by...

  • Differential voltage reference (CB21533E)

      Found in Motorola documentation from 1967, this circuit shows how it is possible to obtain a...

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      This circuit was found in a 1995 documentation, eventually requiring two resistors in series with...

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