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:
Parts List:
Audio Lm 3909 IC-conduction 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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