Wireless Voltage Tester

Description:

This is non-contact  voltage detector ckt it can be used to detect voltage without touching any wire or without removing its insulation it is easy simple and easy to make without any problem and this is tested circuit it contains following components

ic CD4060

LED

S1

R1=1KR

9VDC Battery

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Working Principle:
Detection of voltage is not a big problem we can use a tester and check whether the voltage is available or not but tester is dangerous because it uses direct contact with live wire it may cause of electric shock but this non-contact voltage tester has a great advantage over an old testing method, when it is bring towards the service mains it will start working and its output can be checked by using a LED, when LED starts blinking that means you are near the voltage or current source you can use dual switching because in day timing it is difficult to see the blinking of LED due this day timing we can use a piezo Buzzer which sense the same output but now output is in sound form and easy to sense in day time.

Operation:

This non-contact voltage tester uses electromagnetic field to sense the flow of current or availability of voltage in mains and gives us output. We know that our mains may have 50Hz  or 60Hz frequency and this tester uses 3Hz frequency to detect the output.

The electromagnetic field from the mains power, which has frequency of 50HZ, to IC1, it is frequently divided out to Q4 that divided by 16, Frequency is equal 3HZ, and LED1 flashes to indicate that around the mains power. If there is no mains voltage or current to flow, there is no electromagnetic field. The output of IC1 is not up frequently 3HZ so LED1 does not blink.