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555 Audio ohmmeter circuit

2015-02-04 03:26  
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555 Audio ohmmeter circuit
As shown in Figure 7-9, audio ohmmeter uses 555 as the core. The circuit is actually a multivibrator. The table pen is connected to resistor Rx, and then connected to R3 in parallel, the resistance is different, the oscillation frequency is different, the level of speaker sound is also different. The resistance of measured resistor can be estimated by the level of sound.