RadioShack 22-168

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RadioShack 22-168

The RadioShack 22-168 is a 2000 counts handheld digital multimeter with RS-232 connectivity.

Hardware

  • 3 1/2 digit ADC with bandgap reference: Maxim MAX130CPL (datasheet) (marking: "Maxim MAX130CPL 0138-3 C10039")
  • ?: Metex KS57C2016 (possibly a Samsung KS57C2016 4-bit microcontroller with custom Metex firmware?) (marking: "Metex 95D3 KS57C2016-13 013D 95D3")
  • ?: Metex 9005 (marking has ST logo)
  • ?: 4.1856MHz crystal (?)
  • ?: Intersil ICM7555CBA (datasheet) (marking: "H 7555 CBA L405")
  • Quad analog switch/quad multiplexer: Motorola 14066B (datasheet) (marking: "14066B PBV139")
  • Unidentified ICs: Two ICs, which appear to be SSOP8 packages are hidden behind black goo. The purpose of the goo is unknown.

Photos

  • Device, angle

  • Mugshot

  • Device, back

  • "Metex" logo on the stand

  • Battery compartment

  • Battery cover

  • Opened up

  • Front cover, PCB still mounted

  • Front cover

  • Rear cover

  • Bare electronics

  • Range-switch sandwiched between PCBs

  • Range-switch

  • Main PCB, front

  • Secondary PCB, front

  • Main PCB, front, illuminated

  • Main PCB, back, illuminated

  • Secondary PCB, front, illuminated

  • Secondary PCB, back, illuminated

  • Unidentified components protected by black coating

  • LCD display

  • LCD display, back

TODO

Protocol

TODO

Resources

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