Transistorized multimeter (CB7355E)

This circuit is from a 1967 Triplett manual. The circuit uses components of the time, the common FET and the general-purpose bipolar transistor.

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Manual Heater Control (CB21276E)
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High Q Crystal Filter (CB19698E)
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Magnetic field sensor (CB22344E)
We found this circuit in an English publication from 1995. The Hall sensor used is a component of the...