Audio Lm 3909 IC-Conduction Tester

This tiny conductivity tester works with LM 3909. The tester makes a beeping sound if the resistance between the test probes between 0 and 100 O lies. Due to the volume of the beep, the resistance between the test probes can be determined.

Audio Lm 3909 IC-conduction tester Circuit Diagram: 

tester Circuit Diagram

Parts List:
  •      R1 = 1 k
  •      C1 = 10 uF
  •      C2 = 100 nF
  •      LS = Loudspeaker 12 to 16 Ω
  •      IC1 = LM 3909
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