Index of /images/thumb/e/ea/Photo-zener_diode_tester-internal_circuit.jpg

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      120px-Photo-zener_di..> 2021-03-04 05:01  3.8K  
      180px-Photo-zener_di..> 2021-03-04 05:01  7.5K  
      240px-Photo-zener_di..> 2021-03-04 05:01   12K