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Three-state continuity tester

Based on a Labs project | October 2011 | Find it here
Three-state continuity tester
The continuity tester can distinguish between high-, medium-, and low-resistance connections. When there is a conductance between the inputs, which are linked to small probes, a current flows from the +9 V line to earth via R1 and R2. The consequent potential difference, p.d., across R2 is used to determine the transfer resistance.
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