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
you may also like to read this: Regulated Variable DC power Supply Unit
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.
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.
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.
