• Splitting a floating PSU

    From G8MNY@4:902/6 to WW on Sat Jan 11 08:00:49 2025


    By G8MNY (New Aug 06)
    (8 Bit ASCII graphics use code page 437 or 850, Terminal Font)

    Here is a simple way to spit a single floating power supply into +/- rails. It can be for any voltage 6V-100V to give ñ3V to ñ50V.

    ÚÄÄÄÄÄÄÄÄ¿ +
    ³ ÃÄÄÄÄÂÄÄÄÄÂÄÄÄ>+ve
    ³Floating³ 1K ³/
    ³ ³ ÃÄÄ´NPN
    ³ Power ³ _³_ ³\e
    ³ ³ D1\_/ ÃÄÄÄ>0V
    ³ Supply ³ ³ ³/e
    ³ ³ ÃÄÄ´PNP
    ³ ³ 1K ³\
    ³ ÃÄÄÄÄÁÄÄÄÄÁÄÄÄ>-ve
    ÀÄÄÄÄÄÄÄÄÙ -

    The asymmetrical currents & voltages will affect the components needed (e.g. transistors have to handle peak offset current & heat), in some applications, e.g. value of 1K R may be 39K on 100V. Higher currents may need darlingtons or P & N ch MOSFETs.

    The above circuit should provide adequate balance for testing most things that need a balanced supply.

    D1 provides some cross over bias keeping the transistors in class B, 2 diodes in series may do better, but easy to get into class AB/A & get hot when this is not needed!


    Y Don't U send an interesting bul?

    73 de John G8MNY @ GB7CIP





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