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Hans Krobath

Hans Krobath is an independent consultant with EEC, Nesconset, N.Y.


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Author Articles

  • Drive Large 7-Segment LED Displays Using Only 1 Or 2 MCU Pins

    By Hans Krobath, November 16, 2006

    Many options exist to drive seven-segment LED displays, but most are limited to low output currents. The approach described here uses one 74ALS374 or 74AS374 octal latch, wired as a shift register, per digit. The 74ALS374/74LS374 can handle a

  • ATtiny 11 Hex File And Source Code

    By Hans Krobath, February 16, 2006

    Hex Code for ATtiny 11:

  • Powerline Dropout Simulator Tests Reset Circuits

    By Hans Krobath, February 16, 2006

    Short ac powerline dropouts can cause incomplete power-on resets, leaving the microcontroller and logic circuits in an indeterminate state. This susceptibility can be tested using a very low-cost eight-pin microprocessor and a solidstate relay (SSR). Ope

  • Sense Small Inductance Changes Over A Wide Range

    By Hans Krobath, June 09, 2005

    Small inductance changes on the order of 0.01% can easily be sensed over a wide range with a simple circuit connected to a serial port (see the figure). Using a classic Colpitts oscillator interfaced to an eight-pin Atmel ATtiny12-8 microprocessor,

  • Sense Small Capacitance Changes Over A Wide Range

    By Hans Krobath, September 20, 2004

    With this simple circuit connected to a serial port, small capacitance deviations on the order of 0.01 pF can be easily sensed over a wide range of several hundred picofarads (see the figure)....