NASA NTRS · 19800000445
Low-resistance continuity tester
Abstract
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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Reasoner, R. B.. 1981-04-01. Low-resistance continuity tester. https://ntrs.nasa.gov/citations/19800000445
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