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  • Off line Telephone tester

    Here is a circuit of an off-line telephone tester which does not require any telephone line for testing a telephone instrument. VN:F [1.6.9_936]please wait…Rating: 5.0/10 (2 votes cast)VN:F [1.6.9_936]Rating: 0 (from 2 votes)

  • Zener Diode Tester

    Here is a handy zener diode tester which tests zener diodes with breakdown voltages extending up to 120 volts. VN:F [1.6.9_936]please wait…Rating: 4.5/10 (4 votes cast)VN:F [1.6.9_936]Rating: +1 (from 1 vote)