Non- contact voltage measurement with digital chip

Thread Starter

Amirreza Amiri

Joined Sep 20, 2018
2
hi, who to change range of antenna from non contact voltage measurement?
for example i like detected 220v ac at 1 cm, 2cm or 5cm ?
can i make this changes with Potentiometer or what ?
I Attached my circuit

TNX
 

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danadak

Joined Mar 10, 2018
4,057
The circuit depends on C coupling, and can be affected by humidity
because of the hi Z nature of what you are trying to do.

And its not clear how clk in with schmidt interface what Z it is, hopefully its
buffered.

Regards, Dana.
 

DickCappels

Joined Aug 21, 2008
7,545
You can vary the sensitivity by varying the area of the antenna facing the source of the field and/or by adjusting the power supply voltage to the CD4017.

This all depends on what your intended use is. It might be that some kind of preamp and signal conditioning would help -generally letting CMOS inputs float can lead to problems.
 
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