IC printed-circuit board tester measures resistance as low as 0.1 ohm but uses little power. Two 4.7 kilohm resistors and connected transistors prevent current flow through operational amplifier until probe circuit is complete, eliminating need for on/off switch. Zener diode in series with amplifier output prevents audio oscillator operation until output has sufficient amplitude. Circuit utilizes 741 operational amplifier on 11.2 volt battery or lower voltage amplifiers.


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    Titel :

    Low-resistance continuity tester


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    01.04.1981



    Medientyp :

    Sonstige


    Format :

    Keine Angabe


    Sprache :

    Englisch





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