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  • Testing v8.1 of the BJT Transistor Experimentation Board…

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    by

    Andrew
    in , , ,

    …with a Colpitts oscillator setup. – See the schematics in the images. Version 8.1 adds: * Optional Vcc+ supply filter using resistor, ferrite bead or inductor * Collector resistor split for gain boost experiments * Additional feedback network for common collector stages * Extra ground point for cleaner external feedback wiring Everything worked as expected.…

  • The Class AB Amplifier explained on a conceptual level

    The Class AB Amplifier explained on a conceptual level

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    by

    Andrew
    in , ,

    Based on the Motorola Application Note AN-422 Many classic audio power amplifiers from the 1970s and 1980s were built around a small collection of elegant circuit techniques that remain relevant today. One such example is the Motorola AN-422 Class-AB amplifier topology. While schematics of these amplifiers are widely available, understanding why each section exists is…

  • BJT Transistor Experimentation Board – Version 8.1 Released

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    by

    Andrew
    in

    I’m pleased to introduce Version 8.1 of the BJT Transistor Experimentation Board. The new board is now available here: https://ufelectronics.eu/product/common-emitter-collector-amplifier-board-v8-1/ Although Version 8 has proven to be a useful platform for experimenting with common emitter and common collector transistor circuits, practical use and continued development revealed several opportunities for improvement. Rather than redesigning the board…